总结了几个月的东西终于能和大家分享了，不多说，直接看东西！
1、禁止手机睡眠
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[UIApplication sharedApplication].idleTimerDisabled = YES;
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2、隐藏某行cell
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- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
// 如果是你需要隐藏的那一行，返回高度为0
if
(indexPath.row == YouWantToHideRow)
return
0;
return
44;
}
// 然后再你需要隐藏cell的时候调用
[self.tableView beginUpdates];
[self.tableView endUpdates];
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3、禁用button高亮
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button.adjustsImageWhenHighlighted = NO;
或者在创建的时候
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
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4、tableview遇到这种报错failed to obtain a cell from its dataSource
是因为你的cell被调用的早了。先循环使用了cell，后又创建cell。顺序错了
可能原因：1、xib的cell没有注册 2、内存中已经有这个cell的缓存了(也就是说通过你的cellId找到的cell并不是你想要的类型)，这时候需要改下cell的标识
5、cocoa pods报这个错误：unable to access ‘https://github.com/facebook/pop.git/': Operation timed out after 0 milliseconds with 0 out of 0 bytes received
解决办法：原因可能是网络问题，网络请求超时了，只需要重试就行了
6、cocoa pods 出现ERROR: While executing gem ... (Errno::EPERM)
解决办法：
https://segmentfault.com/q/1010000002926243
7、动画切换window的根控制器
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// options是动画选项
[UIView transitionWithView:[UIApplication sharedApplication].keyWindow duration:0.5f options:UIViewAnimationOptionTransitionCrossDissolve animations:^{
BOOL oldState = [UIView areAnimationsEnabled];
[UIView setAnimationsEnabled:NO];
[UIApplication sharedApplication].keyWindow.rootViewController = [RootViewController
new
];
[UIView setAnimationsEnabled:oldState];
} completion:^(BOOL finished) {
}];
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8、去除数组中重复的对象
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NSArray *newArr = [oldArr valueForKeyPath:@“@distinctUnionOfObjects.self"];
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9、编译的时候遇到 no such file or directory: ／users／apple／XXX
是因为编译的时候，在此路径下找不到这个文件，解决这个问题，首先是是要检查缺少的文件是不是在工程中，如果不在工程中，需要从本地拖进去，如果发现已经存在工程中了，或者拖进去还是报错，这时候需要去build phases中搜索这个文件，这时候很可能会搜出现两个相同的文件，这时候，有一个路径是正确的，删除另外一个即可。如果删除了还是不行，需要把两个都删掉，然后重新往工程里拖进这个文件即可
10、iOS8系统中，tableView最好实现下-tableView: heightForRowAtIndexPath:这个代理方法，要不然在iOS8中可能就会出现显示不全或者无法响应事件的问题
11、iOS8中实现侧滑功能的时候这个方法必须实现，要不然在iOS8中无法侧滑
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// 必须写的方法，和editActionsForRowAtIndexPath配对使用，里面什么不写也行
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
}
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12、三个通知
NSSystemTimeZoneDidChangeNotification监听修改时间界面的两个按钮状态变化
UIApplicationSignificantTimeChangeNotification 监听用户改变时间 （只要点击自动设置按钮就会调用） NSSystemClockDidChangeNotification 监听用户修改时间（时间不同才会调用）
13、SDWebImage本地缓存有时候会害人。如果之前缓存过一张图片，即使下次服务器换了这张图片，但是图片url没换，用sdwebimage下载下来的还是以前那张,所以遇到这种问题，不要先去怼服务器，清空下缓存再试就好了。
14、上线前注意：
-
1）、删掉代码中所有的测试代码
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2）、如果后台有审核模式，提醒后台开启此模式
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3）、主流程再跑一跑
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4）、全局搜索waring，检查所有标记waring的地方
15、跳进app权限设置
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// 跳进app设置
if
(UIApplicationOpenSettingsURLString != NULL) {
NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
[[UIApplication sharedApplication] openURL:url];
}
}
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16、给一个view截图
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UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0.0);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
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17、开发中如果要动态修改tableView的tableHeaderView或者tableFooterView的高度，需要给tableView重新设置，而不是直接更改高度。正确的做法是重新设置一下tableView.tableFooterView = 更改过高度的view。为什么？其实在iOS8以上直接改高度是没有问题的，在iOS8中出现了contentSize不准确的问题，这是解决办法。
18、注意对象为nil的时候，调用此对象分类的方法不会执行
19、collectionView的内容小于其宽高的时候是不能滚动的，设置可以滚动：
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collectionView.alwaysBounceHorizontal = YES;
collectionView.alwaysBounceVertical = YES;
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20、设置navigationBar上的title颜色和大小
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[self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor youColor], NSFontAttributeName : [UIFont systemFontOfSize:15]}]
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21、颜色转图片
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+ (UIImage *)cl_imageWithColor:(UIColor *)color {
CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return
image;
}
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22、view设置圆角
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#define ViewBorderRadius(View, Radius, Width, Color)\
\
[View.layer setCornerRadius:(Radius)];\
[View.layer setMasksToBounds:YES];\
[View.layer setBorderWidth:(Width)];\
[View.layer setBorderColor:[Color CGColor]]
// view圆角
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23、强／弱引用
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#define WeakSelf(type) __weak typeof(type) weak##type = type; // weak
#define StrongSelf(type) __strong typeof(type) type = weak##type; // strong
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24、由角度转换弧度
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#define DegreesToRadian(x) (M_PI * (x) / 180.0)
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25、由弧度转换角度
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#define RadianToDegrees(radian) (radian*180.0)/(M_PI)
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26、获取图片资源
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#define GetImage(imageName) [UIImage imageNamed:[NSString stringWithFormat:@"%@",imageName]]
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27、获取temp
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#define PathTemp NSTemporaryDirectory()
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28、获取沙盒 Document
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#define PathDocument [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]
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29、获取沙盒 Cache
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#define PathCache [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]
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30、GCD代码只执行一次
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#define kDISPATCH_ONCE_BLOCK(onceBlock) static dispatch_once_t onceToken; dispatch_once(&onceToken, onceBlock);
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31、自定义NSLog
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#ifdef DEBUG
#define NSLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__)
#else
#define NSLog(...)
#endif
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32、Font
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#define FontL(s) [UIFont systemFontOfSize:s weight:UIFontWeightLight]
#define FontR(s) [UIFont systemFontOfSize:s weight:UIFontWeightRegular]
#define FontB(s) [UIFont systemFontOfSize:s weight:UIFontWeightBold]
#define FontT(s) [UIFont systemFontOfSize:s weight:UIFontWeightThin]
#define Font(s) FontL(s)
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33、FORMAT
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#define FORMAT(f, ...) [NSString stringWithFormat:f, ## __VA_ARGS__]
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34、在主线程上运行
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#define kDISPATCH_MAIN_THREAD(mainQueueBlock) dispatch_async(dispatch_get_main_queue(), mainQueueBlock);
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35、开启异步线程
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#define kDISPATCH_GLOBAL_QUEUE_DEFAULT(globalQueueBlock) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), globalQueueBlocl);
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36、通知
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#define NOTIF_ADD(n, f) [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(f) name:n object:nil]
#define NOTIF_POST(n, o) [[NSNotificationCenter defaultCenter] postNotificationName:n object:o]
#define NOTIF_REMV() [[NSNotificationCenter defaultCenter] removeObserver:self]
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37、随机颜色
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+ (UIColor *)RandomColor {
NSInteger aRedValue = arc4random() % 255;
NSInteger aGreenValue = arc4random() % 255;
NSInteger aBlueValue = arc4random() % 255;
UIColor *randColor = [UIColor colorWithRed:aRedValue / 255.0f green:aGreenValue / 255.0f blue:aBlueValue / 255.0f alpha:1.0f];
return
randColor;
}
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38、获取window
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+(UIWindow*)getWindow {
UIWindow* win = nil;
//[UIApplication sharedApplication].keyWindow;
for
(id item
in
[UIApplication sharedApplication].windows) {
if
([item class] == [UIWindow class]) {
if
(!((UIWindow*)item).hidden) {
win = item;
break
;
}
}
}
return
win;
}
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39、修改textField的placeholder的字体颜色、大小
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[textField setValue:[UIColor redColor] forKeyPath:@
"_placeholderLabel.textColor"
];
[textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@
"_placeholderLabel.font"
];
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40、统一收起键盘
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[[[UIApplication sharedApplication] keyWindow] endEditing:YES];
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41、控制屏幕旋转，在控制器中写
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/** 是否支持自动转屏 */
- (BOOL)shouldAutorotate {
return
YES;
}
/** 支持哪些屏幕方向 */
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
return
UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
}
/** 默认的屏幕方向（当前ViewController必须是通过模态出来的UIViewController（模态带导航的无效）方式展现出来的，才会调用这个方法） */
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
return
UIInterfaceOrientationLandscapeLeft | UIInterfaceOrientationLandscapeRight;
}
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42、获取app缓存大小
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- (CGFloat)getCachSize {
NSUInteger imageCacheSize = [[SDImageCache sharedImageCache] getSize];
//获取自定义缓存大小
//用枚举器遍历 一个文件夹的内容
//1.获取 文件夹枚举器
NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@
"Library/Caches"
];
NSDirectoryEnumerator *enumerator = [[NSFileManager defaultManager] enumeratorAtPath:myCachePath];
__block NSUInteger count = 0;
//2.遍历
for
(NSString *fileName
in
enumerator) {
NSString *path = [myCachePath stringByAppendingPathComponent:fileName];
NSDictionary *fileDict = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:nil];
count += fileDict.fileSize;
//自定义所有缓存大小
}
// 得到是字节 转化为M
CGFloat totalSize = ((CGFloat)imageCacheSize+count)/1024/1024;
return
totalSize;
}
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43、清理app缓存
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- (void)handleClearView {
//删除两部分
//1.删除 sd 图片缓存
//先清除内存中的图片缓存
[[SDImageCache sharedImageCache] clearMemory];
//清除磁盘的缓存
[[SDImageCache sharedImageCache] clearDisk];
//2.删除自己缓存
NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@
"Library/Caches"
];
[[NSFileManager defaultManager] removeItemAtPath:myCachePath error:nil];
}
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44、模型转字典
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static NSSet *classes;
- (NSMutableDictionary *)getParameterDictionary {
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
Class c = self.class;
while
(c) {
unsigned count;
objc_property_t *properties = class_copyPropertyList([c class], &count);
for
(int i = 0; i < count; i++) {
NSString *key = [NSString stringWithUTF8String:property_getName(properties[i])];
dict[key] = [self valueForKey:key];
}
free(properties);
// 获得父类
c = class_getSuperclass(c);
if
([self isClassFromFoundation:c])
break
;
}
return
dict;
}
- (BOOL)isClassFromFoundation:(Class)c
{
if
(c == [NSObject class] || c == [NSManagedObject class])
return
YES;
__block BOOL result = NO;
[[self foundationClasses] enumerateObjectsUsingBlock:^(Class foundationClass, BOOL *stop) {
if
([c isSubclassOfClass:foundationClass]) {
result = YES;
*stop = YES;
}
}];
return
result;
}
- (NSSet *)foundationClasses
{
if
(classes == nil) {
// 集合中没有NSObject，因为几乎所有的类都是继承自NSObject，具体是不是NSObject需要特殊判断
classes = [NSSet setWithObjects:
[NSURL class],
[NSDate class],
[NSValue class],
[NSData class],
[NSError class],
[NSArray class],
[NSDictionary class],
[NSString class],
[NSAttributedString class], nil];
}
return
classes;
}
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45、交换两个方法实现
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Class aClass = [self class];
SEL originalSelector = @selector(viewWillAppear:);
SEL swizzledSelector = @selector(xxx_viewWillAppear:);
Method originalMethod = class_getInstanceMethod(aClass, originalSelector);
Method swizzledMethod = class_getInstanceMethod(aClass, swizzledSelector);
BOOL didAddMethod =
class_addMethod(aClass,
originalSelector,
method_getImplementation(swizzledMethod),
method_getTypeEncoding(swizzledMethod));
if
(didAddMethod) {
class_replaceMethod(aClass,
swizzledSelector,
method_getImplementation(originalMethod),
method_getTypeEncoding(originalMethod));
}
else
{
method_exchangeImplementations(originalMethod, swizzledMethod);
}
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46、打印百分号和引号
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NSLog(@
"%%"
);
NSLog(@
"\""
);
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47、几个常用权限判断
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if
([CLLocationManager authorizationStatus] ==kCLAuthorizationStatusDenied) {
NSLog(@
"没有定位权限"
);
}
AVAuthorizationStatus statusVideo = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
if
(statusVideo == AVAuthorizationStatusDenied) {
NSLog(@
"没有摄像头权限"
);
}
//是否有麦克风权限
AVAuthorizationStatus statusAudio = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];
if
(statusAudio == AVAuthorizationStatusDenied) {
NSLog(@
"没有录音权限"
);
}
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
if
(status == PHAuthorizationStatusDenied) {
NSLog(@
"没有相册权限"
);
}
}];
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48、获取手机型号
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+ (NSString *)getDeviceInfo {
struct utsname systemInfo;
uname(&systemInfo);
NSString *platform = [NSString stringWithCString:systemInfo.machine encoding:NSASCIIStringEncoding];
if
([platform isEqualToString:@
"iPhone1,1"
])
return
@
"iPhone 2G"
;
if
([platform isEqualToString:@
"iPhone1,2"
])
return
@
"iPhone 3G"
;
if
([platform isEqualToString:@
"iPhone2,1"
])
return
@
"iPhone 3GS"
;
if
([platform isEqualToString:@
"iPhone3,1"
])
return
@
"iPhone 4"
;
if
([platform isEqualToString:@
"iPhone3,2"
])
return
@
"iPhone 4"
;
if
([platform isEqualToString:@
"iPhone3,3"
])
return
@
"iPhone 4"
;
if
([platform isEqualToString:@
"iPhone4,1"
])
return
@
"iPhone 4S"
;
if
([platform isEqualToString:@
"iPhone5,1"
])
return
@
"iPhone 5"
;
if
([platform isEqualToString:@
"iPhone5,2"
])
return
@
"iPhone 5"
;
if
([platform isEqualToString:@
"iPhone5,3"
])
return
@
"iPhone 5c"
;
if
([platform isEqualToString:@
"iPhone5,4"
])
return
@
"iPhone 5c"
;
if
([platform isEqualToString:@
"iPhone6,1"
])
return
@
"iPhone 5s"
;
if
([platform isEqualToString:@
"iPhone6,2"
])
return
@
"iPhone 5s"
;
if
([platform isEqualToString:@
"iPhone7,1"
])
return
@
"iPhone 6 Plus"
;
if
([platform isEqualToString:@
"iPhone7,2"
])
return
@
"iPhone 6"
;
if
([platform isEqualToString:@
"iPhone8,1"
])
return
@
"iPhone 6s"
;
if
([platform isEqualToString:@
"iPhone8,2"
])
return
@
"iPhone 6s Plus"
;
// 日行两款手机型号均为日本独占，可能使用索尼FeliCa支付方案而不是苹果支付
if
([platform isEqualToString:@
"iPhone9,1"
])
return
@
"国行、日版、港行iPhone 7"
;
if
([platform isEqualToString:@
"iPhone9,2"
])
return
@
"港行、国行iPhone 7 Plus"
;
if
([platform isEqualToString:@
"iPhone9,3"
])
return
@
"美版、台版iPhone 7"
;
if
([platform isEqualToString:@
"iPhone9,4"
])
return
@
"美版、台版iPhone 7 Plus"
;
if
([platform isEqualToString:@
"iPhone8,4"
])
return
@
"iPhone SE"
;
if
([platform isEqualToString:@
"iPod1,1"
])
return
@
"iPod Touch 1G"
;
if
([platform isEqualToString:@
"iPod2,1"
])
return
@
"iPod Touch 2G"
;
if
([platform isEqualToString:@
"iPod3,1"
])
return
@
"iPod Touch 3G"
;
if
([platform isEqualToString:@
"iPod4,1"
])
return
@
"iPod Touch 4G"
;
if
([platform isEqualToString:@
"iPod5,1"
])
return
@
"iPod Touch 5G"
;
if
([platform isEqualToString:@
"iPad1,1"
])
return
@
"iPad 1G"
;
if
([platform isEqualToString:@
"iPad2,1"
])
return
@
"iPad 2"
;
if
([platform isEqualToString:@
"iPad2,2"
])
return
@
"iPad 2"
;
if
([platform isEqualToString:@
"iPad2,3"
])
return
@
"iPad 2"
;
if
([platform isEqualToString:@
"iPad2,4"
])
return
@
"iPad 2"
;
if
([platform isEqualToString:@
"iPad2,5"
])
return
@
"iPad Mini 1G"
;
if
([platform isEqualToString:@
"iPad2,6"
])
return
@
"iPad Mini 1G"
;
if
([platform isEqualToString:@
"iPad2,7"
])
return
@
"iPad Mini 1G"
;
if
([platform isEqualToString:@
"iPad3,1"
])
return
@
"iPad 3"
;
if
([platform isEqualToString:@
"iPad3,2"
])
return
@
"iPad 3"
;
if
([platform isEqualToString:@
"iPad3,3"
])
return
@
"iPad 3"
;
if
([platform isEqualToString:@
"iPad3,4"
])
return
@
"iPad 4"
;
if
([platform isEqualToString:@
"iPad3,5"
])
return
@
"iPad 4"
;
if
([platform isEqualToString:@
"iPad3,6"
])
return
@
"iPad 4"
;
if
([platform isEqualToString:@
"iPad4,1"
])
return
@
"iPad Air"
;
if
([platform isEqualToString:@
"iPad4,2"
])
return
@
"iPad Air"
;
if
([platform isEqualToString:@
"iPad4,3"
])
return
@
"iPad Air"
;
if
([platform isEqualToString:@
"iPad4,4"
])
return
@
"iPad Mini 2G"
;
if
([platform isEqualToString:@
"iPad4,5"
])
return
@
"iPad Mini 2G"
;
if
([platform isEqualToString:@
"iPad4,6"
])
return
@
"iPad Mini 2G"
;
if
([platform isEqualToString:@
"i386"
])
return
@
"iPhone Simulator"
;
if
([platform isEqualToString:@
"x86_64"
])
return
@
"iPhone Simulator"
;
return
platform;
}
|
49、长按复制功能
|
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- (void)viewDidLoad
{
[self.view addGestureRecognizer:[[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(pasteBoard:)]];
}
- (void)pasteBoard:(UILongPressGestureRecognizer *)longPress {
if
(longPress.state == UIGestureRecognizerStateBegan) {
UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
pasteboard.string = @
"需要复制的文本"
;
}
}
|
50、cocoapods升级
在终端执行 sudo gem install -n / usr / local / bin cocoapods --pre
51、设置启动页后，依然显示之前的
删除app，手机重启，重新安装
52、判断图片类型
|
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//通过图片Data数据第一个字节 来获取图片扩展名
- (NSString *)contentTypeForImageData:(NSData *)data
{
uint8_t c;
[data getBytes:&c length:1];
switch
(c)
{
case
0xFF:
return
@
"jpeg"
;
case
0x89:
return
@
"png"
;
case
0x47:
return
@
"gif"
;
case
0x49:
case
0x4D:
return
@
"tiff"
;
case
0x52:
if
([data length] < 12) {
return
nil;
}
NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(0, 12)] encoding:NSASCIIStringEncoding];
if
([testString hasPrefix:@
"RIFF"
]
&& [testString hasSuffix:@
"WEBP"
])
{
return
@
"webp"
;
}
return
nil;
}
return
nil;
}
|
53、获取手机和app信息
|
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NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
CFShow(infoDictionary);
// app名称
NSString *app_Name = [infoDictionary objectForKey:@
"CFBundleDisplayName"
];
// app版本
NSString *app_Version = [infoDictionary objectForKey:@
"CFBundleShortVersionString"
];
// app build版本
NSString *app_build = [infoDictionary objectForKey:@
"CFBundleVersion"
];
//手机序列号
NSString* identifierNumber = [[UIDevice currentDevice] uniqueIdentifier];
NSLog(@
"手机序列号: %@"
,identifierNumber);
//手机别名： 用户定义的名称
NSString* userPhoneName = [[UIDevice currentDevice] name];
NSLog(@
"手机别名: %@"
, userPhoneName);
//设备名称
NSString* deviceName = [[UIDevice currentDevice] systemName];
NSLog(@
"设备名称: %@"
,deviceName );
//手机系统版本
NSString* phoneVersion = [[UIDevice currentDevice] systemVersion];
NSLog(@
"手机系统版本: %@"
, phoneVersion);
//手机型号
NSString* phoneModel = [[UIDevice currentDevice] model];
NSLog(@
"手机型号: %@"
,phoneModel );
//地方型号 （国际化区域名称）
NSString* localPhoneModel = [[UIDevice currentDevice] localizedModel];
NSLog(@
"国际化区域名称: %@"
,localPhoneModel );
NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
// 当前应用名称
NSString *appCurName = [infoDictionary objectForKey:@
"CFBundleDisplayName"
];
NSLog(@
"当前应用名称：%@"
,appCurName);
// 当前应用软件版本 比如：1.0.1
NSString *appCurVersion = [infoDictionary objectForKey:@
"CFBundleShortVersionString"
];
NSLog(@
"当前应用软件版本:%@"
,appCurVersion);
// 当前应用版本号码 int类型
NSString *appCurVersionNum = [infoDictionary objectForKey:@
"CFBundleVersion"
];
NSLog(@
"当前应用版本号码：%@"
,appCurVersionNum);
|
54、获取一个类的所有属性
|
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3
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7
|
id LenderClass = objc_getClass(
"Lender"
);
unsigned int outCount, i;
objc_property_t *properties = class_copyPropertyList(LenderClass, &outCount);
for
(i = 0; i < outCount; i++) {
objc_property_t property = properties[i];
fprintf(stdout,
"%s %s\n"
, property_getName(property), property_getAttributes(property));
}
|
55、image圆角
|
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|
- (UIImage *)circleImage
{
// NO代表透明
UIGraphicsBeginImageContextWithOptions(self.size, NO, 1);
// 获得上下文
CGContextRef ctx = UIGraphicsGetCurrentContext();
// 添加一个圆
CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
// 方形变圆形
CGContextAddEllipseInRect(ctx, rect);
// 裁剪
CGContextClip(ctx);
// 将图片画上去
[self drawInRect:rect];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return
image;
}
|
56、image拉伸
|
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2
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5
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7
|
+ (UIImage *)resizableImage:(NSString *)imageName
{
UIImage *image = [UIImage imageNamed:imageName];
CGFloat imageW = image.size.width;
CGFloat imageH = image.size.height;
return
[image resizableImageWithCapInsets:UIEdgeInsetsMake(imageH * 0.5, imageW * 0.5, imageH * 0.5, imageW * 0.5) resizingMode:UIImageResizingModeStretch];
}
|
57、JSON字符串转字典
|
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2
3
4
5
|
+ (NSDictionary *)parseJSONStringToNSDictionary:(NSString *)JSONString {
NSData *JSONData = [JSONString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *responseJSON = [NSJSONSerialization JSONObjectWithData:JSONData options:NSJSONReadingMutableLeaves error:nil];
return
responseJSON;
}
|
58、身份证号验证
|
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10
|
- (BOOL)validateIdentityCard {
BOOL flag;
if
(self.length <= 0) {
flag = NO;
return
flag;
}
NSString *regex2 = @
"^(\\d{14}|\\d{17})(\\d|[xX])$"
;
NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@
"SELF MATCHES %@"
,regex2];
return
[identityCardPredicate evaluateWithObject:self];
}
|
59、获取设备mac地址
|
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|
+ (NSString *)macAddress {
int mib[6];
size_t len;
char *buf;
unsigned char *ptr;
struct if_msghdr *ifm;
struct sockaddr_dl *sdl;
mib[0] = CTL_NET;
mib[1] = AF_ROUTE;
mib[2] = 0;
mib[3] = AF_LINK;
mib[4] = NET_RT_IFLIST;
if
((mib[5] = if_nametoindex(
"en0"
)) == 0) {
printf(
"Error: if_nametoindex error\n"
);
return
NULL;
}
if
(sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
printf(
"Error: sysctl, take 1\n"
);
return
NULL;
}
if
((buf = malloc(len)) == NULL) {
printf(
"Could not allocate memory. Rrror!\n"
);
return
NULL;
}
if
(sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
printf(
"Error: sysctl, take 2"
);
return
NULL;
}
ifm = (struct if_msghdr *)buf;
sdl = (struct sockaddr_dl *)(ifm + 1);
ptr = (unsigned char *)LLADDR(sdl);
NSString *outstring = [NSString stringWithFormat:@
"X:X:X:X:X:X"
,
*ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];
free(buf);
return
outstring;
}
|
60、导入自定义字体库
-
1、找到你想用的字体的 ttf 格式，拖入工程
-
2、在工程的plist中增加一行数组，“Fonts provided by application”
-
3、为这个key添加一个item，value为你刚才导入的ttf文件名
-
4、直接使用即可：label.font = [UIFont fontWithName:@"你刚才导入的ttf文件名" size:20.0]；
61、拿到当前正在显示的控制器，不管是push进去的，还是present进去的都能拿到
|
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13
|
- (UIViewController *)getVisibleViewControllerFrom:(UIViewController*)vc {
if
([vc isKindOfClass:[UINavigationController class]]) {
return
[self getVisibleViewControllerFrom:[((UINavigationController*) vc) visibleViewController]];
}
else
if
([vc isKindOfClass:[UITabBarController class]]){
return
[self getVisibleViewControllerFrom:[((UITabBarController*) vc) selectedViewController]];
}
else
{
if
(vc.presentedViewController) {
return
[self getVisibleViewControllerFrom:vc.presentedViewController];
}
else
{
return
vc;
}
}
}
|
62、runtime为一个类动态添加属性
|
1
2
|
// 动态添加属性的本质是: 让对象的某个属性与值产生关联
objc_setAssociatedObject(self, WZBPlaceholderViewKey, placeholderView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
|
63、获取runtime为一个类动态添加的属性
|
1
|
objc_getAssociatedObject(self, WZBPlaceholderViewKey);
|
64、KVO监听某个对象的属性
|
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|
// 添加监听者
[self addObserver:self forKeyPath:property options:NSKeyValueObservingOptionNew context:nil];
// 当监听的属性值变化的时候会来到这个方法
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if
([keyPath isEqualToString:@
"property"
]) {
[self textViewTextChange];
}
else
{
}
}
|
65、Reachability判断网络状态
|
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10
|
NetworkStatus status = [[Reachability reachabilityForInternetConnection] currentReachabilityStatus];
if
(status == NotReachable) {
NSLog(@
"当前设备无网络"
);
}
if
(status == ReachableViaWiFi) {
NSLog(@
"当前wifi网络"
);
}
if
(status == NotReachable) {
NSLog(@
"当前蜂窝移动网络"
);
}
|
66、AFNetworking监听网络状态
|
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|
// 监听网络状况
AFNetworkReachabilityManager *mgr = [AFNetworkReachabilityManager sharedManager];
[mgr setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
switch
(status) {
case
AFNetworkReachabilityStatusUnknown:
break
;
case
AFNetworkReachabilityStatusNotReachable: {
[SVProgressHUD showInfoWithStatus:@
"当前设备无网络"
];
}
break
;
case
AFNetworkReachabilityStatusReachableViaWiFi:
[SVProgressHUD showInfoWithStatus:@
"当前Wi-Fi网络"
];
break
;
case
AFNetworkReachabilityStatusReachableViaWWAN:
[SVProgressHUD showInfoWithStatus:@
"当前蜂窝移动网络"
];
break
;
default
:
break
;
}
}];
[mgr startMonitoring];
|
67、透明颜色不影响子视图透明度
|
1
|
[UIColor colorWithRed: green: blue: alpha:];
|
68、取图片某一点的颜色
|
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|
if
(point.x < 0 || point.y < 0)
return
nil;
CGImageRef imageRef = self.CGImage;
NSUInteger width = CGImageGetWidth(imageRef);
NSUInteger height = CGImageGetHeight(imageRef);
if
(point.x >= width || point.y >= height)
return
nil;
unsigned char *rawData = malloc(height * width * 4);
if
(!rawData)
return
nil;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
NSUInteger bytesPerPixel = 4;
NSUInteger bytesPerRow = bytesPerPixel * width;
NSUInteger bitsPerComponent = 8;
CGContextRef context = CGBitmapContextCreate(rawData,
width,
height,
bitsPerComponent,
bytesPerRow,
colorSpace,
kCGImageAlphaPremultipliedLast
| kCGBitmapByteOrder32Big);
if
(!context) {
free(rawData);
return
nil;
}
CGColorSpaceRelease(colorSpace);
CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);
CGContextRelease(context);
int byteIndex = (bytesPerRow * point.y) + point.x * bytesPerPixel;
CGFloat red = (rawData[byteIndex] * 1.0) / 255.0;
CGFloat green = (rawData[byteIndex + 1] * 1.0) / 255.0;
CGFloat blue = (rawData[byteIndex + 2] * 1.0) / 255.0;
CGFloat alpha = (rawData[byteIndex + 3] * 1.0) / 255.0;
UIColor *result = nil;
result = [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
free(rawData);
return
result;
|
69、判断该图片是否有透明度通道
|
1
2
3
4
5
6
7
8
|
- (BOOL)hasAlphaChannel
{
CGImageAlphaInfo alpha = CGImageGetAlphaInfo(self.CGImage);
return
(alpha == kCGImageAlphaFirst ||
alpha == kCGImageAlphaLast ||
alpha == kCGImageAlphaPremultipliedFirst ||
alpha == kCGImageAlphaPremultipliedLast);
}
|
70、获得灰度图
|
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9
10
11
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14
15
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20
21
|
+ (UIImage*)covertToGrayImageFromImage:(UIImage*)sourceImage
{
int width = sourceImage.size.width;
int height = sourceImage.size.height;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();
CGContextRef context = CGBitmapContextCreate (nil,width,height,8,0,colorSpace,kCGImageAlphaNone);
CGColorSpaceRelease(colorSpace);
if
(context == NULL) {
return
nil;
}
CGContextDrawImage(context,CGRectMake(0, 0, width, height), sourceImage.CGImage);
CGImageRef contextRef = CGBitmapContextCreateImage(context);
UIImage *grayImage = [UIImage imageWithCGImage:contextRef];
CGContextRelease(context);
CGImageRelease(contextRef);
return
grayImage;
}
|
71、根据bundle中的文件名读取图片
|
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35
36
37
|
+ (UIImage *)imageWithFileName:(NSString *)name {
NSString *extension = @
"png"
;
NSArray *components = [name componentsSeparatedByString:@
"."
];
if
([components count] >= 2) {
NSUInteger lastIndex = components.count - 1;
extension = [components objectAtIndex:lastIndex];
name = [name substringToIndex:(name.length-(extension.length+1))];
}
// 如果为Retina屏幕且存在对应图片，则返回Retina图片，否则查找普通图片
if
([UIScreen mainScreen].scale == 2.0) {
name = [name stringByAppendingString:@
"@2x"
];
NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:extension];
if
(path != nil) {
return
[UIImage imageWithContentsOfFile:path];
}
}
if
([UIScreen mainScreen].scale == 3.0) {
name = [name stringByAppendingString:@
"@3x"
];
NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:extension];
if
(path != nil) {
return
[UIImage imageWithContentsOfFile:path];
}
}
NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:extension];
if
(path) {
return
[UIImage imageWithContentsOfFile:path];
}
return
nil;
}
|
72、合并两个图片
|
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8
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11
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13
14
15
|
+ (UIImage*)mergeImage:(UIImage*)firstImage withImage:(UIImage*)secondImage {
CGImageRef firstImageRef = firstImage.CGImage;
CGFloat firstWidth = CGImageGetWidth(firstImageRef);
CGFloat firstHeight = CGImageGetHeight(firstImageRef);
CGImageRef secondImageRef = secondImage.CGImage;
CGFloat secondWidth = CGImageGetWidth(secondImageRef);
CGFloat secondHeight = CGImageGetHeight(secondImageRef);
CGSize mergedSize = CGSizeMake(MAX(firstWidth, secondWidth), MAX(firstHeight, secondHeight));
UIGraphicsBeginImageContext(mergedSize);
[firstImage drawInRect:CGRectMake(0, 0, firstWidth, firstHeight)];
[secondImage drawInRect:CGRectMake(0, 0, secondWidth, secondHeight)];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return
image;
}
|
73、根据bundle中的图片名创建imageview
|
1
2
3
4
|
+ (id)imageViewWithImageNamed:(NSString*)imageName
{
return
[[UIImageView alloc] initWithImage:[UIImage imageNamed:imageName]];
}
|
74、为imageView添加倒影
|
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23
|
CGRect frame = self.frame;
frame.origin.y += (frame.size.height + 1);
UIImageView *reflectionImageView = [[UIImageView alloc] initWithFrame:frame];
self.clipsToBounds = TRUE;
reflectionImageView.contentMode = self.contentMode;
[reflectionImageView setImage:self.image];
reflectionImageView.transform = CGAffineTransformMakeScale(1.0, -1.0);
CALayer *reflectionLayer = [reflectionImageView layer];
CAGradientLayer *gradientLayer = [CAGradientLayer layer];
gradientLayer.bounds = reflectionLayer.bounds;
gradientLayer.position = CGPointMake(reflectionLayer.bounds.size.width / 2, reflectionLayer.bounds.size.height * 0.5);
gradientLayer.colors = [NSArray arrayWithObjects:
(id)[[UIColor clearColor] CGColor],
(id)[[UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:0.3] CGColor], nil];
gradientLayer.startPoint = CGPointMake(0.5,0.5);
gradientLayer.endPoint = CGPointMake(0.5,1.0);
reflectionLayer.mask = gradientLayer;
[self.superview addSubview:reflectionImageView];
|
75、画水印
|
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10
11
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15
|
// 画水印
- (void) setImage:(UIImage *)image withWaterMark:(UIImage *)mark inRect:(CGRect)rect
{
if
([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0)
{
UIGraphicsBeginImageContextWithOptions(self.frame.size, NO, 0.0);
}
//原图
[image drawInRect:self.bounds];
//水印图
[mark drawInRect:rect];
UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.image = newPic;
}
|
76、让label的文字内容显示在左上／右上／左下／右下／中心顶／中心底部
|
1
2
3
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9
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31
32
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34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
自定义UILabel
// 重写label的textRectForBounds方法
- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines {
CGRect rect = [
super
textRectForBounds:bounds limitedToNumberOfLines:numberOfLines];
switch
(self.textAlignmentType) {
case
WZBTextAlignmentTypeLeftTop: {
rect.origin = bounds.origin;
}
break
;
case
WZBTextAlignmentTypeRightTop: {
rect.origin = CGPointMake(CGRectGetMaxX(bounds) - rect.size.width, bounds.origin.y);
}
break
;
case
WZBTextAlignmentTypeLeftBottom: {
rect.origin = CGPointMake(bounds.origin.x, CGRectGetMaxY(bounds) - rect.size.height);
}
break
;
case
WZBTextAlignmentTypeRightBottom: {
rect.origin = CGPointMake(CGRectGetMaxX(bounds) - rect.size.width, CGRectGetMaxY(bounds) - rect.size.height);
}
break
;
case
WZBTextAlignmentTypeTopCenter: {
rect.origin = CGPointMake((CGRectGetWidth(bounds) - CGRectGetWidth(rect)) / 2, CGRectGetMaxY(bounds) - rect.origin.y);
}
break
;
case
WZBTextAlignmentTypeBottomCenter: {
rect.origin = CGPointMake((CGRectGetWidth(bounds) - CGRectGetWidth(rect)) / 2, CGRectGetMaxY(bounds) - CGRectGetMaxY(bounds) - rect.size.height);
}
break
;
case
WZBTextAlignmentTypeLeft: {
rect.origin = CGPointMake(0, rect.origin.y);
}
break
;
case
WZBTextAlignmentTypeRight: {
rect.origin = CGPointMake(rect.origin.x, 0);
}
break
;
case
WZBTextAlignmentTypeCenter: {
rect.origin = CGPointMake((CGRectGetWidth(bounds) - CGRectGetWidth(rect)) / 2, (CGRectGetHeight(bounds) - CGRectGetHeight(rect)) / 2);
}
break
;
default
:
break
;
}
return
rect;
}
- (void)drawTextInRect:(CGRect)rect {
CGRect textRect = [self textRectForBounds:rect limitedToNumberOfLines:self.numberOfLines];
[
super
drawTextInRect:textRect];
}
|
77、scrollView上的输入框，键盘挡住的问题
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推荐用IQKeyboardManager这个框架！
手动解决如下
1、监听键盘弹出／消失的通知
2、在通知中加入代码：
NSDictionary* info = [aNotification userInfo];
CGRect keyPadFrame=[[UIApplication sharedApplication].keyWindow convertRect:[[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue] fromView:self.view];
CGSize kbSize =keyPadFrame.size;
CGRect activeRect=[self.view convertRect:activeField.frame fromView:activeField.superview];
CGRect aRect = self.view.bounds;
aRect.size.height -= (kbSize.height);
CGPoint origin = activeRect.origin;
origin.y -= backScrollView.contentOffset.y;
if
(!CGRectContainsPoint(aRect, origin)) {
CGPoint scrollPoint = CGPointMake(0.0,CGRectGetMaxY(activeRect)-(aRect.size.height));
[backScrollView setContentOffset:scrollPoint animated:YES];
}
|
78、frame布局的cell动态高度
这种通常在你的模型中添加一个辅助属性cellHeight，在模型中重写这个属性的get方法，根据你的布局和模型中的其他属性值计算出总高度。最后在tableView：heightForRow方法中，根据indexPath找出对应的模型，返回这个高度即可。
79、AutoLayout布局的cell动态高度
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// 1、设置tableView的属性
self.tableView.rowHeight = UITableViewAutomaticDimension;
self.tableView.estimatedRowHeight = 44.0;
// 这个属性非0，估计cell高度
// 2、至上而下设置cell的约束，注意，上下左右最好都要顶到cell的四周
|
cell
80、使用performSelector:调用函数，内存泄漏问题
当我们在开发中使用[obj performSelector:NSSelectorFromString(@"aMethod")];这类方法时可能会收到一个警告"performSelector may cause a leak because its selector is unknown".
是因为编译器不清楚这个对象能不能相应这个方法，如果不能，则是不安全的，而且编译器也不清楚该怎么处理这个方法的返回值！
|
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使用以下代码调用即可：
if
(! obj) {
return
; }
SEL selector = NSSelectorFromString(@
"aMethod"
);
IMP imp = [obj methodForSelector:selector];
void (*func)(id, SEL) = (void *)imp;
func(obj, selector);
或者：
SEL selector = NSSelectorFromString(@
"aMethod"
);
((void (*)(id, SEL))[obj methodForSelector:selector])(obj, selector);
|
81、一个字符串是否包含另一个字符串
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// 方法1
if
([str1 containsString:str2]) {
NSLog(@
"str1包含str2"
);
}
else
{
NSLog(@
"str1不包含str2"
);
}
// 方法2
if
([str1 rangeOfString: str2].location == NSNotFound) {
NSLog(@
"str1包含str2"
);
}
else
{
NSLog(@
"str1不包含str2"
);
}
|
82、cell去除选中效果
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1
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cell.selectionStyle = UITableViewCellSelectionStyleNone;
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83、cell点按效果
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3
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- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
|
84、当删除一个从xib拖出来的属性时，一定记得把xib中对应的线也删掉，不然会报类似[setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key的crash
点击这个叉号删除
85、真机测试的时候报错：Could not launch "你的 App"，process launch failed: Security
因为你的app没有上线，iOS9开始，需要手动信任Xcode生成的描述文件，打开手机设置->通用->描述文件->点击你的app的描述文件->点击信任
86、真机测试的时候报错：Could not find Developer Disk Image
这是因为你的设备系统版本大于Xcode能兼容的系统版本，比如你的设备是iOS10.3，而Xcode版本是8.2（Xcode8.2最大兼容iOS10.2），就会报这个错误。解决办法就是升级Xcode！
87、UITextView没有placeholder的问题？
网上有很多此类自定义控件，也可以参考下我写的一个UITextView分类 UITextView-WZB
88、移除字符串中的空格和换行
|
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+ (NSString *)removeSpaceAndNewline:(NSString *)str {
NSString *temp = [str stringByReplacingOccurrencesOfString:@
" "
withString:@
""
];
temp = [temp stringByReplacingOccurrencesOfString:@
"\r"
withString:@
""
];
temp = [temp stringByReplacingOccurrencesOfString:@
"\n"
withString:@
""
];
return
temp;
}
|
89、判断字符串中是否有空格
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10
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+ (BOOL)isBlank:(NSString *)str {
NSRange _range = [str rangeOfString:@
" "
];
if
(_range.location != NSNotFound) {
//有空格
return
YES;
}
else
{
//没有空格
return
NO;
}
}
|
90、获取一个视频的第一帧图片
|
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10
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NSURL *url = [NSURL URLWithString:filepath];
AVURLAsset *asset1 = [[AVURLAsset alloc] initWithURL:url options:nil];
AVAssetImageGenerator *generate1 = [[AVAssetImageGenerator alloc] initWithAsset:asset1];
generate1.appliesPreferredTrackTransform = YES;
NSError *err = NULL;
CMTime time = CMTimeMake(1, 2);
CGImageRef oneRef = [generate1 copyCGImageAtTime:time actualTime:NULL error:&err];
UIImage *one = [[UIImage alloc] initWithCGImage:oneRef];
return
one;
|
91、获取视频的时长
|
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3
4
5
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7
|
+ (NSInteger)getVideoTimeByUrlString:(NSString *)urlString {
NSURL *videoUrl = [NSURL URLWithString:urlString];
AVURLAsset *avUrl = [AVURLAsset assetWithURL:videoUrl];
CMTime time = [avUrl duration];
int seconds = ceil(time.value/time.timescale);
return
seconds;
}
|
92、字符串是否为空
|
1
2
3
|
+ (BOOL)isEqualToNil:(NSString *)str {
return
str.length <= 0 || [str isEqualToString:@
""
] || !str;
}
|
93、将app上传到App Store的时候通常会遇到这个问题
try again
很多人说这事苹果爸爸服务器问题，重复尝试几次，总会成功的！
但是经过尝试发现如果使用Application Loader上传成功率就非常高，所以还是推荐把ipa文件导出直接用Application Loader上传。
如果Application Loader也不行，需要检查下自己的网络，有时候也会提高速度。
94、当tableView占不满一屏时，去除下边多余的单元格
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1
2
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self.tableView.tableHeaderView = [UIView
new
];
self.tableView.tableFooterView = [UIView
new
];
|
95、isKindOfClass和isMemberOfClass的区别
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2
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isKindOfClass可以判断某个对象是否属于某个类，或者这个类的子类。
isMemberOfClass更加精准，它只能判断这个对象类型是否为这个类(不能判断子类)
|
96、__block
当一个局部变量需要在block里改变时，需要在定义时加上__block修饰，具体请看官方文档 http://developer.apple.com/library/ios/documentation/cocoa/Conceptual/Blocks/Articles/bxVariables.html#//apple_ref/doc/uid/TP40007502-CH6-SW6
97、-[ViewController aMethod:]: unrecognized selector sent to instance 0x7fe91e607fb0
这是一个经典错误，ViewController不能响应aMethod这个方法，错误原因可能viewController文件中没有实现aMethod这个方法
98、UITableView () failed to obtain a cell from its dataSource ()
这个错误原因是tableView的代理方法-tableView:cellForRowAtIndexPath:需要返回一个UITableViewCell,而你返回了一个nil。另外这个地方返回值不是UITableViewCell类型也会导致崩溃
99、约束如何做UIView动画？
-
1、把需要改的约束Constraint拖条线出来，成为属性
-
2、在需要动画的地方加入代码，改变此属性的constant属性
-
3、开始做UIView动画，动画里边调用layoutIfNeeded方法
|
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@property (weak, nonatomic) IBOutlet NSLayoutConstraint *buttonTopConstraint;
self.buttonTopConstraint.constant = 100;
[UIView animateWithDuration:.5 animations:^{
[self.view layoutIfNeeded];
}];
|
100、从NSURL中拿到链接字符串
|
1
|
NSString *urlString = myURL.absoluteString;
|
101、将tableView滚动到顶部
|
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2
3
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[tableView setContentOffset:CGPointZero animated:YES];
或者
[tableView scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];
|
102、如果用addTarget:action:forControlEvents:方法为一个button添加了很多点击事件，在某个时刻想一次删除怎么办？只需要调用下边这句代码
|
1
|
[youButton removeTarget:nil action:nil forControlEvents:UIControlEventAllEvents];
|
103、某个字体的高度
|
1
|
font.lineHeight;
|
104、删除某个view所有的子视图
|
1
2
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[[someView subviews]
makeObjectsPerformSelector:@selector(removeFromSuperview)];
|
105、删除NSUserDefaults所有记录
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14
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//方法一
NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];
//方法二
- (void)resetDefaults {
NSUserDefaults * defs = [NSUserDefaults standardUserDefaults];
NSDictionary * dict = [defs dictionaryRepresentation];
for
(id key
in
dict) {
[defs removeObjectForKey:key];
}
[defs synchronize];
}
// 方法三
[[NSUserDefaults standardUserDefaults] setPersistentDomain:[NSDictionary dictionary] forName:[[NSBundle mainBundle] bundleIdentifier]];
|
106、禁用系统滑动返回功能
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16
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- (void)viewDidAppear:(BOOL)animated
{
[
super
viewDidAppear:animated];
if
([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {self.navigationController.interactivePopGestureRecognizer.delegate = self;
}
}
- (void)viewWillDisappear:(BOOL)animated {
[
super
viewWillDisappear:animated];
if
([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {self.navigationController.interactivePopGestureRecognizer.delegate = nil;
}
}
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
return
NO;
}
|
107、模拟器报错
模拟器报错
解决办法：
打开模拟器->Simulator->Reset Content and Settings...
如果不行，就重启试试！
108、自定义cell选中背景颜色
|
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3
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UIView *bgColorView = [[UIView alloc] init];
bgColorView.backgroundColor = [UIColor redColor];
[cell setSelectedBackgroundView:bgColorView];
|
109、UILabel设置内边距
|
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2
3
4
5
6
|
子类化UILabel，重写drawTextInRect方法
- (void)drawTextInRect:(CGRect)rect {
// 边距，上左下右
UIEdgeInsets insets = {0, 5, 0, 5};
[
super
drawTextInRect:UIEdgeInsetsInsetRect(rect, insets)];
}
|
110、UILabel设置文字描边
|
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3
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5
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8
9
10
11
12
13
14
15
16
|
子类化UILabel，重写drawTextInRect方法
- (void)drawTextInRect:(CGRect)rect
{
CGContextRef c = UIGraphicsGetCurrentContext();
// 设置描边宽度
CGContextSetLineWidth(c, 1);
CGContextSetLineJoin(c, kCGLineJoinRound);
CGContextSetTextDrawingMode(c, kCGTextStroke);
// 描边颜色
self.textColor = [UIColor redColor];
[
super
drawTextInRect:rect];
// 文本颜色
self.textColor = [UIColor yellowColor];
CGContextSetTextDrawingMode(c, kCGTextFill);
[
super
drawTextInRect:rect];
}
|
111、使用模拟器截图
|
1
2
|
快捷键command + s
或者File->Save Screen Shot
|
112、scrollView滚动到最下边
|
1
2
|
CGPoint bottomOffset = CGPointMake(0, scrollView.contentSize.height - scrollView.bounds.size.height);
[scrollView setContentOffset:bottomOffset animated:YES];
|
113、UIView背景颜色渐变
|
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2
3
4
5
6
|
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 100)];
[self.view addSubview:view];
CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = view.bounds;
gradient.colors = [NSArray arrayWithObjects:(id)[[UIColor blackColor] CGColor], (id)[[UIColor whiteColor] CGColor], nil];
[view.layer insertSublayer:gradient atIndex:0];
|
114、停止UIView动画
|
1
|
[yourView.layer removeAllAnimations]
|
115、为UIView某个角添加圆角
|
1
2
3
4
5
6
|
// 左上角和右下角添加圆角
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:(UIRectCornerTopLeft | UIRectCornerBottomRight) cornerRadii:CGSizeMake(20, 20)];
CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.frame = view.bounds;
maskLayer.path = maskPath.CGPath;
view.layer.mask = maskLayer;
|
116、删除Xcode Derived data缓存数据
依次点击Xcode -> Preferences -> location，然后点击 Derived data路径后到小箭头，删除这个文件夹下的数据就可以了，如图
Xcode Derived data
117、将一个view放置在其兄弟视图的最上面
|
1
|
[parentView bringSubviewToFront:yourView]
|
118、将一个view放置在其兄弟视图的最下面
|
1
|
[parentView sendSubviewToBack:yourView]
|
119、让手机震动一下
|
1
2
3
4
5
|
倒入框架
#import
AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);
或者
AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
|
120、layoutSubviews方法什么时候调用？
-
1、init方法不会调用
-
2、addSubview方法等时候会调用
-
3、bounds改变的时候调用
-
4、scrollView滚动的时候会调用scrollView的layoutSubviews方法(所以不建议在scrollView的layoutSubviews方法中做复杂逻辑)
-
5、旋转设备的时候调用
-
6、子视图被移除的时候调用
参考请看：http://blog.logichigh.com/2011/03/16/when-does-layoutsubviews-get-called/
121、让UILabel在指定的地方换行
|
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3
|
// 换行符为\n,在需要换行的地方加上这个符号即可，如
label.numberOfLines = 0;
label.text = @
"此处\n换行"
;
|
122、摇一摇功能
|
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3
4
5
6
7
8
9
10
11
12
|
1、打开摇一摇功能
[UIApplication sharedApplication].applicationSupportsShakeToEdit = YES;
2、让需要摇动的控制器成为第一响应者
[self becomeFirstResponder];
3、实现以下方法
// 开始摇动
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
// 取消摇动
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event
// 摇动结束
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
|
123、获取图片大小
|
1
2
|
CGFloat imageWidth = image.size.width;
CGFloat imageHeight = imageWidth * image.scale;
|
124、获取view的坐标在整个window上的位置
|
1
2
3
4
|
// v上的(0, 0)点在toView上的位置
CGPoint point = [v convertPoint:CGPointMake(0, 0) toView:[UIApplication sharedApplication].windows.lastObject];
或者
CGPoint point = [v.superview convertPoint:v.frame.origin toView:[UIApplication sharedApplication].windows.lastObject];
|
125、提交App Store审核程序限制
您的应用程序的未压缩大小必须小于4GB。每个Mach-O可执行文件（例如app_name.app/app_name）不能超过这些限制：
对于MinimumOSVersion小于7.0的应用程序：TEXT二进制文件中所有部分的总数最多为80 MB 。
对于MinimumOSVersion7.x到8.x的应用程序：TEXT对于二进制文件中每个体系结构片段的每个片段，最大为60 MB 。
对于MinimumOSVersion9.0或更高版本的应用程序：__TEXT二进制文件中所有部分的总数最多为500 MB 。参阅：iTunes Connect开发者指南
126、修改UISegmentedControl的字体大小
|
1
|
[segment setTitleTextAttributes:@{NSFontAttributeName : [UIFont systemFontOfSize:15.0f]} forState:UIControlStateNormal];
|
127、在非ViewController的地方弹出UIAlertController对话框
|
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2
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5
6
7
8
9
10
11
12
13
|
// 最好抽成一个分类
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@
"Title"
message:@
"message"
preferredStyle:UIAlertControllerStyleAlert];
//...
id rootViewController = [UIApplication sharedApplication].delegate.window.rootViewController;
if
([rootViewController isKindOfClass:[UINavigationController class]])
{
rootViewController = ((UINavigationController *)rootViewController).viewControllers.firstObject;
}
if
([rootViewController isKindOfClass:[UITabBarController class]])
{
rootViewController = ((UITabBarController *)rootViewController).selectedViewController;
}
[rootViewController presentViewController:alertController animated:YES completion:nil];
|
128、获取一个view所属的控制器
|
1
2
3
4
5
6
7
8
9
10
|
// view分类方法
- (UIViewController *)belongViewController {
for
(UIView *next = [self superview]; next; next = next.superview) {
UIResponder* nextResponder = [next nextResponder];
if
([nextResponder isKindOfClass:[UIViewController class]]) {
return
(UIViewController *)nextResponder;
}
}
return
nil;
}
|
129、UIImage和base64互转
|
1
2
3
4
5
6
7
8
9
|
// view分类方法
- (NSString *)encodeToBase64String:(UIImage *)image {
return
[UIImagePNGRepresentation(image) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
}
- (UIImage *)decodeBase64ToImage:(NSString *)strEncodeData {
NSData *data = [[NSData alloc]initWithBase64EncodedString:strEncodeData options:NSDataBase64DecodingIgnoreUnknownCharacters];
return
[UIImage imageWithData:data];
}
|
130、UIWebView设置背景透明
|
1
2
|
[webView setBackgroundColor:[UIColor clearColor]];
[webView setOpaque:NO];
|
131、判断NSDate是不是今天
|
1
2
3
4
5
6
7
8
|
NSDateComponents *otherDay = [[NSCalendar currentCalendar] components:NSCalendarUnitEra | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:aDate];
NSDateComponents *today = [[NSCalendar currentCalendar] components:NSCalendarUnitEra | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:[NSDate date]];
if
([today day] == [otherDay day] &&
[today month] == [otherDay month] &&
[today year] == [otherDay year] &&
[today era] == [otherDay era]) {
// 是今天
}
|
132、设置tableView分割线颜色
|
1
|
[self.tableView setSeparatorColor:[UIColor myColor]];
|
133、设置屏幕方向
|
1
|
[[UIDevice currentDevice] setValue:@(UIInterfaceOrientationLandscapeLeft) forKey:@
"orientation"
];
|
134、比较两个颜色是否相等
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
|
- (BOOL)isEqualToColor:(UIColor *)otherColor {
CGColorSpaceRef colorSpaceRGB = CGColorSpaceCreateDeviceRGB();
6
UIColor *(^convertColorToRGBSpace)(UIColor*) = ^(UIColor *color) {
if
(CGColorSpaceGetModel(CGColorGetColorSpace(color.CGColor)) == kCGColorSpaceModelMonochrome) {
const CGFloat *oldComponents = CGColorGetComponents(color.CGColor);
CGFloat components[4] = {oldComponents[0], oldComponents[0], oldComponents[0], oldComponents[1]};
CGColorRef colorRef = CGColorCreate( colorSpaceRGB, components );
6
UIColor *color = [UIColor colorWithCGColor:colorRef];
CGColorRelease(colorRef);
return
color;
}
else
return
color;
};
6
UIColor *selfColor = convertColorToRGBSpace(self);
otherColor = convertColorToRGBSpace(otherColor);
CGColorSpaceRelease(colorSpaceRGB);
return
[selfColor isEqual:otherColor];
}
|
135、tableViewCell分割线顶到头
|
1
2
3
4
5
6
7
8
9
10
|
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
[cell setSeparatorInset:UIEdgeInsetsZero];
[cell setLayoutMargins:UIEdgeInsetsZero];
cell.preservesSuperviewLayoutMargins = NO;
}
- (void)viewDidLayoutSubviews {
[self.tableView setSeparatorInset:UIEdgeInsetsZero];
[self.tableView setLayoutMargins:UIEdgeInsetsZero];
}
|
136、不让控制器的view随着控制器的xib拉伸或压缩
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1
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self.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
|
137、cocoaPods报错 : [!] Unable to add a source with url https://github.com/CocoaPods/Specs.git named master-1.
You can try adding it manually in ~/.cocoapods/repos or via pod repo add.
解决方法：这是因为电脑里安装了另外一个Xcode导致cocoapods找不到路径了
在终端执行 sudo xcode-select -switch /Applications/Xcode.app 即可
138、安装cocoapods的时候出现 ERROR: While executing gem ... (Errno::EPERM)
|
1
|
Operation not permitted - /usr/bin/pod
|
解决办法：直接在终端执行 sudo gem install -n /usr/local/bin cocoapods
139、在状态栏增加网络请求的菊花，类似safari加载网页的时候状态栏菊花
|
1
|
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
|
140、检查一个rect是否包含一个point
|
1
2
|
// point是否在rect内
BOOL isContains = CGRectContainsPoint(rect, point);
|
141、在指定的宽度下，让UILabel自动设置最佳font
|
1
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label.adjustsFontSizeToFitWidth = YES;
|
142、将一个image保存在相册中
|
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14
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UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
或者
#import
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
PHAssetChangeRequest *changeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];
changeRequest.creationDate = [NSDate date];
} completionHandler:^(BOOL success, NSError *error) {
if
(success) {
NSLog(@
"successfully saved"
);
}
else
{
NSLog(@
"error saving to photos: %@"
, error);
}
}];
|
143、修改cell.imageView的大小
|
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7
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UIImage *icon = [UIImage imageNamed:@
""
];
CGSize itemSize = CGSizeMake(30, 30);
UIGraphicsBeginImageContextWithOptions(itemSize, NO ,0.0);
CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
[icon drawInRect:imageRect];
cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
|
144、为一个view添加虚线边框
|
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CAShapeLayer *border = [CAShapeLayer layer];
border.strokeColor = [UIColor colorWithRed:67/255.0f green:37/255.0f blue:83/255.0f alpha:1].CGColor;
border.fillColor = nil;
border.lineDashPattern = @[@4, @2];
border.path = [UIBezierPath bezierPathWithRect:view.bounds].CGPath;
border.frame = view.bounds;
[view.layer addSublayer:border];
|
145、UITextView中打开或禁用复制，剪切，选择，全选等功能
|
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// 继承UITextView重写这个方法
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
// 返回NO为禁用，YES为开启
// 粘贴
if
(action == @selector(paste:))
return
NO;
// 剪切
if
(action == @selector(cut:))
return
NO;
// 复制
if
(action == @selector(copy:))
return
NO;
// 选择
if
(action == @selector(select:))
return
NO;
// 选中全部
if
(action == @selector(selectAll:))
return
NO;
// 删除
if
(action == @selector(
delete
:))
return
NO;
// 分享
if
(action == @selector(share))
return
NO;
return
[
super
canPerformAction:action withSender:sender];
}
|
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