1、去掉UITableView没有内容显示的cell
self.tableView.tableFooterView = [UIView new];
2、修改UITableView自带的线条（颜色和位置）
//ios8 设置UITableViewCell左侧默认15像素的空白
if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)]) {
[self.tableView setSeparatorInset:UIEdgeInsetsMake(0, 0, 0, 0)];
[self.tableView setSeparatorColor:SC_TABLEVIE_LINELIGTHT];
}
if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) {
[self.tableView setLayoutMargins:UIEdgeInsetsZero];
}
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{
if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {
[cell setSeparatorInset:UIEdgeInsetsMake(0, 0, 0, 0)];
}
if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
[cell setLayoutMargins:UIEdgeInsetsZero];
}
}
3、约束动画实现
self.shareBtnBgTopConstraint.constant = -102;
// 告诉约束需要更新
[self.shareBtnBgView setNeedsUpdateConstraints];
// 调用此方法告诉检测是否需要更新约束，若需要则更新，下面添加动画效果才起作用
[self.shareBtnBgView updateConstraintsIfNeeded];
[UIView animateWithDuration:0.5 animations:^{
self.shareView.alpha = 0.6;
[self.view layoutIfNeeded];
}];
4、单例实现方法
+ (HttpRequestEngine *)shareInstance{
static HttpRequestEngine *httpEngine = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
httpEngine = [[HttpRequestEngine alloc] init];
});
return httpEngine;
}
5、AFNetWorking监听网络变化
#pragma mark - 监听网络变化
- (void)buggedNetWorkChange{
AFNetworkReachabilityManager *afNetworkReachabilityManager = [AFNetworkReachabilityManager sharedManager];
[afNetworkReachabilityManager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
switch (status) {
case AFNetworkReachabilityStatusNotReachable:{
NSLog(@"无网络");
break;
}
case AFNetworkReachabilityStatusReachableViaWiFi:{
NSLog(@"WiFi网络");
break;
}
case AFNetworkReachabilityStatusReachableViaWWAN:{
NSLog(@"2G/3G/4G网络");
break;
}
default:
break;
}
}];
[afNetworkReachabilityManager startMonitoring];
}
【6】UITextField占位文字的颜色的修改（.h和.m文件实现）
@interface UITextField (PHColor)
/**
* 占位文字颜色
*/
@property (strong, nonatomic) UIColor *placeholderColor;
@end
@implementation UITextField (PHColor)
- (void)setPlaceholderColor:(UIColor *)placeholderColor{
BOOL change = NO;
if (self.placeholder == nil) {
self.placeholder = @" ";
change = YES;
}
[self setValue:placeholderColor forKeyPath:@"placeholderLabel.textColor"];
if (change) {
self.placeholderColor = nil;
}
}
- (UIColor *)placeholderColor{
return [self valueForKey:@"placeholderLabel.textColor"];
}
@end
【7】iOS导航栏NavigationBar设置透明，以及添加变色的动画
透明只需设置NavigationBar的背景图片为一张空图片即可
[self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
NavigationBar下边有一个ShadowImage，也可以通过设置空的UIImage设置透明
[self.navigationController.navigationBar setShadowImage:[UIImage new]];
变色动画，在NavigationBar下插入一个view，执行动画改变这个view的透明度即可。
CGRect frame = self.navigationController.navigationBar.frame;
_alphaView = [[UIView alloc] initWithFrame:CGRectMake(0, -20, frame.size.width, frame.size.height+20)];
_alphaView.backgroundColor = [UIColor greenColor];
_alphaView.userInteractionEnabled = NO;
[self.navigationController.navigationBar insertSubview:_alphaView atIndex:0];
【8】iOS 实现ScrollView 上滑隐藏Navigationbar,下滑显示
#pragma mark 滑动隐藏导航栏
-(void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset{
if (velocity.y>0) {
[self.navigationController setNavigationBarHidden:YES animated:YES];
}else {
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
}
【9】去掉UIWebView中弹框的alertView的title
Js中有Alert、confirm和promopt三种类似iOS本地的UIAlertView 样子，但是在iOS的app中弹出alertView的title是url地址,不怎么美观，可以用以下方法解决：
///新建一个UIWebView的扩展类，然后在用到webView的类里引用头文件就OK了
@interface UIWebView (JavaScripAlert)
- (void)webView:(UIWebView *)sender runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(id)frame;
- (BOOL)webView:(UIWebView *)sender runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(id)frame;
@end
@implementation UIWebView (JavaScripAlert)
static BOOL status = NO;
static BOOL isEnd =NO;
- (void)webView:(UIWebView *)sender runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(id)frame {
UIAlertView* customAlert = [[UIAlertView alloc] initWithTitle:@"提示"
message:message
delegate:nil
cancelButtonTitle:@"确定"
otherButtonTitles:nil];
[customAlert show];
}
- (NSString *) webView:(UIWebView *)view runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(NSString *)text initiatedByFrame:(id)frame {
return @"";
}
- (BOOL)webView:(UIWebView *)sender runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(id)frame {
UIAlertView *confirmDiag = [[UIAlertView alloc] initWithTitle:@"提示"
message:message
delegate:self
cancelButtonTitle:@"取消"
otherButtonTitles:@"确定",nil];
[confirmDiag show];
CGFloat version = [[[UIDevice currentDevice] systemVersion]floatValue];
if (version >= 7.) {
while (isEnd == NO) {
[[NSRunLoop mainRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.01f]];
}
}else {
while (isEnd ==NO && confirmDiag.superview !=nil) {
[[NSRunLoop mainRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.01f]];
}
}
isEnd = NO;
return status;
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
status = buttonIndex;
isEnd = YES;
}
@end
【10】获取磁盘总空间大小
+ (CGFloat)diskOfAllSizeMBytes {
CGFloat size = 0.0;
NSError *error;
NSDictionary *dic = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
if (error) {
#ifdef DEBUG
NSLog(@"error: %@", error.localizedDescription);
#endif
}else{
NSNumber *number = [dic objectForKey:NSFileSystemSize];
size = [number floatValue]/1024/1024;
}
return size;
}
获取磁盘可用空间大小
+ (CGFloat)diskOfFreeSizeMBytes{
CGFloat size = 0.0;
NSError *error;
NSDictionary *dic = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
if (error) {
#ifdef DEBUG
NSLog(@"error: %@", error.localizedDescription);
#endif
}else{
NSNumber *number = [dic objectForKey:NSFileSystemFreeSize];
size = [number floatValue]/1024/1024;
}
return size;
}
【11】判断字符串中是否含有中文
+ (BOOL)isHaveChineseInString:(NSString *)string {
for(NSInteger i = 0; i < [string length]; i++){
int a = [string characterAtIndex:i];
if (a >= 0x4e00 && a < 0x9fff) {
return YES;
}
}
return NO;
}
【12】Xcode调试：
a、快速定位约束冲突方法：
添加UIViewAlertForUnsatisfiableConstraints的断点
b、常用调试断点
[NSException raise]
objc_exception_throw
【13】当遇到一些老古董设备的时候，程序运行出现以下错误：
dyld: Library not loaded: /System/Library/Frameworks/Contacts.framework/Contacts
Referenced from: /private/var/mobile/Containers/Bundle/Application/90A475A5-8EC4-416A-A354-0401D1CF5152/Butler.app/Butler
Reason: image not found
解决办法：
Project-> Targets-> Build Phases-> Link Binary with Libraries
设置 Contacts.framework 的 status 为 Optional 搞定！
【14】UITableViewCell处于选中状态下，UIView的背景颜色消失的解决办法：
/// 在cell的以下两个方法里重新设置view的背景颜色
- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];
self.pointView.backgroundColor = SC_TEXT_GREEN_COLOR;
}
- (void)setHighlighted:(BOOL)highlighted animated:(BOOL)animated {
[super setHighlighted:highlighted animated:animated];
self.pointView.backgroundColor = SC_TEXT_GREEN_COLOR;
}
待续，持续完善...