【IOS】iPhone开发技巧&cocos2d(更新中...)
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开发技巧
1、 如果在程序中想对某张图片进行处理的话（得到某张图片的一部分）可一用以下代码：
UIImage *image = [UIImage imageNamed:filename]; CGImageRef imageRef = image.CGImage; CGRect rect = CGRectMake(origin.x, origin.y ,size.width, size.height); CGImageRef imageRefRect = CGImageCreateWithImageInRect(imageRef, rect); UIImage *imageRect = [[UIImage alloc] initWithCGImage:imageRefRect];
2、判断设备是iphone还是iphone4的代码：
#define isRetina ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) : NO)
3、判断邮箱输入的是否正确：
- (BOOL) validateEmail: (NSString *) candidate {
NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
return [emailTest evaluateWithObject:candidate];
}
4、如何把当前的视图作为照片保存到相册中去：
#import <QuartzCore/QuartzCore.h> UIGraphicsBeginImageContext(currentView.bounds.size); //currentView 当前的view [currentView.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);
5、本地通知（类似于push通知）按home键到后台 十秒后触发：
UILocalNotification *notification=[[UILocalNotification alloc] init];
if (notification!=nil) {
NSLog(@">> support local notification");
NSDate *now=[NSDate new];
notification.fireDate=[now addTimeInterval:10];
notification.timeZone=[NSTimeZone defaultTimeZone];
notification.alertBody=@"该去吃晚饭了！";
[[UIApplication sharedApplication].scheduleLocalNotification:notification];
6、捕获iphone通话事件：
CTCallCenter *center = [[CTCallCenter alloc] init];
center.callEventHandler = ^(CTCall *call)
{
NSLog(@"call:%@", call.callState);
}
7、iOS 4 引入了多任务支持，所以用户按下 “Home” 键以后程序可能并没有退出而是转入了后台运行。如果您想让应用直接退出，最简单的方法是：在 info－plist 里面找到 Application does not run in background 一项，勾选即可。
8、使UIimageView的图像旋转：
float rotateAngle = M_PI; CGAffineTransform transform=CGAffineTransformMakeRotation(rotateAngle); imageView.transform = transform;
9、设置旋转的原点：
#import <QuartzCore/QuartzCore.h> UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bg.png"]]; imageView.layer.anchorPoint = CGPointMake(0.5, 1.0);
10、实现自定义的状态栏（遮盖状态栏）：
CGRect frame = {{0, 0}, {320, 20}};
UIWindow* wd = [[UIWindow alloc] initWithFrame:frame];
[wd setBackgroundColor:[UIColor clearColor]];
[wd setWindowLevel:UIWindowLevelStatusBar];
frame = CGRectMake(100, 0, 30, 20);
UIImageView* img = [[UIImageView alloc] initWithFrame:frame];
[img setContentMode:UIViewContentModeCenter];
[img setImage:[UIImage imageNamed:@"00_0103.png"]];
[wd addSubview:img];
[wd makeKeyAndVisible];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:2];
frame.origin.x += 150;
[img setFrame:frame];
[UIView commitAnimations];
11、在程序中实现电话的拨打：
//添加电话图标按钮
UIButton *btnPhone = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
btnPhone.frame = CGRectMake(280,10,30,30);
UIImage *image = [UIImage imageNamed:@"phone.png"];
[btnPhone setBackgroundImage:image forState:UIControlStateNormal];
//点击拨号按钮直接拨号
[btnPhone addTarget:self action:@selector(callAction:event:)forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:btnPhone]; //cell是一个UITableViewCell
//定义点击拨号按钮时的操作
- (void)callAction:(id)sender event:(id)event{
NSSet *touches = [event allTouches];
UITouch *touch = [touches anyObject];
CGPoint currentTouchPosition = [touch locationInView:self.listTable];
NSIndexPath *indexPath = [self.listTable indexPathForRowAtPoint: currentTouchPosition];
if (indexPath == nil) {
return;
}
NSInteger section = [indexPath section];
NSUInteger row = [indexPath row];
NSDictionary *rowData = [datas objectAtIndex:row];
NSString *num = [[NSString alloc] initWithFormat:@"tel://%@",number]; //number为号码字符串
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:num]]; //拨号
}
12、更改iphone的键盘颜色：
1.只有这2种数字键盘才有效果。UIKeyboardTypeNumberPad，UIKeyboardTypePhonePad
2. keyboardAppearance ＝ UIKeyboardAppearanceAlert
- (void)textViewDidBeginEditing:(UITextView *)textView{
NSArray *ws = [[UIApplication sharedApplication] windows];
for(UIView *w in ws){
NSArray *vs = [w subviews];
for(UIView *v in vs)
{
if([[NSString stringWithUTF8String:object_getClassName(v)] isEqualToString:@"UIKeyboard"])
{
v.backgroundColor = [UIColor redColor];
}
}
}
13、设置时区
NSTimeZone *defaultTimeZone = [NSTimeZone defaultTimeZone]; NSTimeZone *tzGMT = [NSTimeZone timeZoneWithName:@"GMT"]; [NSTimeZone setDefaultTimeZone:tzGMT];
上面两个时区任意用一个。
14、Ipad隐藏键盘的同时触发方法。
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil]; - (IBAction)keyboardWillHide:(NSNotification *)note
15、在一个程序中打开另一个程序的方法。
http://www.cocoachina.com/iphonedev/sdk/2010/0322/768.html
16、计算字符串的字数
-(int)calculateTextNumber:(NSString *)text
{
float number = 0.0;
int index = 0;
for (index; index < [text length]; index++)
{
NSString *protoText = [text substringToIndex:[text length] - index];
NSString *toChangetext = [text substringToIndex:[text length] -1 -index];
NSString *charater;
if ([toChangetext length]==0)
{
charater = protoText;
}
else{
NSRange range = [text rangeOfString:toChangetext];
charater = [protoText stringByReplacingCharactersInRange:range withString:@""];
}
NSLog(charater);
if ([charater lengthOfBytesUsingEncoding:NSUTF8StringEncoding] == 3)
{
number++;
}
else
{
number = number+0.5;
}
}
return ceil(number);
}
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cocos2d-iphone（v2.1，xcode5.0）
1.添加cocos2d-iphone模板到xcode中
在终端用下述命令添加模板到xcode中： sudo path/install-templates.sh -f
说明1：其中，sudo 为获取root权限，path为cocos2d路径+解压后的文件名，-f表示覆盖已经存在的cocos2d模板。
说明2：如果已经或去过root权限，再次添加模板不用添加 sudo。添加也无所谓，终端会有错误提示，再改就是，嘿嘿！~
2.利用cocos2d-iphone模板创建应用之后，编译成功但无法运行
问题描述：用最基础的cocos2d模板创建项目之后，编译成功，但是无法运行，提示“choose a destination with a supported architecture in order to run on this device. xcode 5”。
网上也有类似错误，解决方法包括：检查项目文件名是否有空格；检查app所需系统版本是否高于Xcode能运行的版本；但是这些问题在楼主的新建项目中都不存在。
问题解决：最后决定，先跳过运行这一步，直接“convert project to ARC”。然后，提示有19个错误，检查之后发现都是，创建自动释放池，id前加*，或者使用了被弃用的方法。
转换之后，再点击运行，终于看到helloword界面。虽然对着mac本本有四个月，而第一次使用xcode也是一年前的事了，但是始终都对mac和xoce心存畏惧，唉，要抓紧时间了。
3.新建项目，按照书上对Cocos2d项目支持ARC的步骤进行，最后编译时报错
问题描述：
Ld /Users/marong/Library/Developer/Xcode/DerivedData/HelloWord2-ddijqbonjxfttwbhiexrtaphvgfq/Build/Products/Debug-iphonesimulator/HelloWord2.app/HelloWord2 normal i386 cd /Users/marong/project/Cocos2d/HelloWord2 setenv IPHONEOS_DEPLOYMENT_TARGET 6.1 setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.0.sdk -L/Users/marong/Library/Developer/Xcode/DerivedData/HelloWord2-ddijqbonjxfttwbhiexrtaphvgfq/Build/Products/Debug-iphonesimulator -F/Users/marong/Library/Developer/Xcode/DerivedData/HelloWord2-ddijqbonjxfttwbhiexrtaphvgfq/Build/Products/Debug-iphonesimulator -filelist /Users/marong/Library/Developer/Xcode/DerivedData/HelloWord2-ddijqbonjxfttwbhiexrtaphvgfq/Build/Intermediates/HelloWord2.build/Debug-iphonesimulator/HelloWord2.build/Objects-normal/i386/HelloWord2.LinkFileList -Xlinker -objc_abi_version -Xlinker 2 -lz -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=6.1 -lcocos2d-library -framework OpenAL -framework UIKit -framework QuartzCore -framework AVFoundation -framework CoreGraphics -framework OpenGLES -framework Foundation -framework AudioToolbox -Xlinker -dependency_info -Xlinker /Users/marong/Library/Developer/Xcode/DerivedData/HelloWord2-ddijqbonjxfttwbhiexrtaphvgfq/Build/Intermediates/HelloWord2.build/Debug-iphonesimulator/HelloWord2.build/Objects-normal/i386/HelloWord2_dependency_info.dat -o /Users/marong/Library/Developer/Xcode/DerivedData/HelloWord2-ddijqbonjxfttwbhiexrtaphvgfq/Build/Products/Debug-iphonesimulator/HelloWord2.app/HelloWord2 ld: library not found for -lcocos2d-library clang: error: linker command failed with exit code 1 (use -v to see invocation)
感觉应该是sdk的版本不对。运行在模拟器中给定的是7.0的版本，但是项目要求的是6.1。到网上搜了一下 添加旧sdk版本到xcode中的方法。
copy the iPhoneOS5.1.sdk to the directory /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk and iPhoneSimulator5.1.sdk to /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk
问题解决：明天早上继续。。。
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