iPhone开发中的技巧整理
1、NSCalendar用法 -(NSString *) getWeek:(NSDate *)d{NSCalendar *calendar = [[NSCalendar alloc]initWithCalendarIdentifier:NSGregorianCalendar];unsigned units = NSYearCalendarUnit | NSMonthCalendarUnit |NSDayCalendarUnit | NSWeekCalendarUnit;NSDateComponents *components = [calendar components:unitsfromDate:d];[calendar release];switch ([components weekday]) {case1:return @"Monday"; break;case2:return @"Tuesday"; break;case3:return @"Wednesday"; break;case4:return @"Thursday"; break;case5:return @"Friday"; break;case6:return @"Saturday"; break;case7:return @"Sunday"; break;default:return @"NO Week"; break;}NSLog(@"%@",components); } 2、将网络数据读取为字符串-(NSString *)getDataByURL:(NSString *)url {return [[NSString alloc] initWithData:[NSData dataWithContentsOfURL: [NSURL URLWithString:[url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]] encoding:NSUTF8StringEncoding];} 3、读取?络图?-(UIImage *)getImageByURL:(NSString *)url {return [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL: [NSURL URLWithString:[url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]];} 4、多线程(这种方式,只管建立线程,不管回收线程)[NSThread detachNewThreadSelector:@selector(scheduleTask) toTarget:self withObject:nil];-(void)scheduleTask{NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];[pool release]; } 如果有参数,则这么?[NSThread detachNewThreadSelector:@selector(scheduleTask:) toTarget:self withObject:[NSDate date]];-(void)scheduleTask:(NSDate *)mdate{NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];[pool release]; } 在线程?运?主线程?的?法[self performSelectorOnMainThread:@selector(moveToMain) withObject:nil waitUntilDone:FALSE]; 5、?户缺省值NSUserDefaults读取:NSUserDefaults *df = [NSUserDefaults standardUserDefaults];NSArray *languages = [df objectForKey:@"AppleLanguages"]; NSLog(@"all language is %@",languages);NSLog(@"index is %@",[languages objectAtIndex:0]);NSLocale *currentLocale = [NSLocale currentLocale];NSLog(@"language Code is %@",[currentLocale objectForKey:NSLocaleLanguageCode]); NSLog(@"Country Code is %@",[currentLocale objectForKey:NSLocaleCountryCode]); 6、view之间转换的动态效果设置SecondViewController *secondViewController = [[SecondViewController alloc] init];secondViewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;//?水平翻转[self.navigationController presentModalViewController:secondViewController animated:YES];[secondViewController release]; 7、UIScrollView 滑动用法: -(void)scrollViewDidScroll:(UIScrollView *)scrollView{NSLog(@"正在滑动中。。")}//?户直接滑动UIScrollView,可以看到滑动条-(void)scrollViewDidEndDelerating:(UIScrollView *)scrollView {}//通过其他控件触发UIScrollView滑动,看不到滑动条-(void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {}//UIScrollView 设置滑动不超出本?身范围[scrollView setBounces:NO]; 8、iphone的系统目录://得到Document:目录NSArray *paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);NSString *documentsDirectory = [paths objectAtIndex:0];//得到temp临时目录NSString *temPath = NSTemporaryDirectory();//得到目录上的文件地址NSString *address = [paths stringByAppendingPathComponent:@"1.rtf"]; 9、状态栏显?示indicator[UIApplication sharedApplication].networkActivityIndicatorVisible = YES; 10、app Icon显示数字:- (void)applicationDidEnterBackground:(UIApplication *)application{ [[UIApplication sharedApplication] setApplicationIconBadgeNumber:5];}11、sqlite保存地址:NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectoryNSUserDomainMask, YES);NSString *thePath = [paths objectAtIndex:0];NSString *filePath = [thePath stringByAppendingPathComponent:@"kilometer.sqlite"];NSString *dbPath = [[[NSBundle mainBundle] resourcePathstringByAppendingPathComponent:@"kilometer2.sqlite"]; 12、键盘弹出隐藏,textfield变位置_tspasswordTF = [[UITextField alloc] initWithFrame: CGRectMake(100,150, 260, 30)];_tspasswordTF.backgroundColor = [UIColor redColor];_tspasswordTF.tag = 2;/*Use this method to release shared resources, save user data,_tspasswordTF.delegate = self;[self.window addSubview: _tspasswordTF]; - (void)textFieldDidBeginEditing:(UITextField *)textField {[self animateTextField: textField up: YES]; } - (BOOL)textFieldShouldReturn:(UITextField *)textField {[self animateTextField: textField up: NO]; [textField resignFirstResponder];return YES;}- (void) animateTextField: (UITextField*) textField up: (BOOL) up {const int movementDistance = 80; // tweak as needed const float movementDuration = 0.3f; // tweak as neededint movement = (up ? -movementDistance : movementDistance);[UIView beginAnimations: nil context: nil]; [UIView setAnimationBeginsFromCurrentState: YES]; [UIView setAnimationDuration: movementDuration];self.window.frame = CGRectOffset(self.window.frame, 0, movement);[UIView commitAnimations]; } 13、获取图片的尺?CGImageRef img = [imageView.image CGImage]; NSLog(@"%d",CGImageGetWidth(img)); NSLog(@"%d",CGImageGetHeight(img)); 14、AlertView,ActionSheet的cancelButton点击事件:- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex: (NSInteger)buttonIndex; // before animation and hiding view{ NSLog(@"cancel alertView... buttonindex = %d",buttonIndex); //当?用户按下Cancel按钮 if (buttonIndex == [alertView cancelButtonIndex]){ exit(0); }}- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex{NSLog(@"%s %d button = %d cancel actionSheet.....",__FUNCTION__,__LINE__, buttonIndex);//当?用户按下Cancel按钮 if (buttonIndex == [actionSheet cancelButtonIndex]) { exit(0); } }15、给window设置全局背景图片self.window.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@""]]; 16、tabcontroller随意切换tabbar-(void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController 或者-(BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController或者_tabBarController.selectedIndex = tabIndex; 17、计算字符串?度:CGFloat w = [title sizeWithFont:[UIFont fontWithName:@"Arial" size: 18]].width; 18、计算点到线段的最短距离根据结果坐标使?用CLLocation类的函数计算实际距离。 doublex1, y1, x2, y2, x3, y3;double px =x2 -x1;double py = y2 -y1;double som = px *px + py *py;double u =((x3 - x1)*px +(y3 - y1)*py)/som; if(u > 1){ u=1; }if (u < 0) { u =0;}//the closest pointdouble x = x1 + u *px; double y = y1 + u * py; double dx = x - x3; double dy = y - y3;double dist = sqrt(dx*dx + dy*dy); 19、UISearchBar背景透明 在使用UISearchBar时,将背景?设定为clearColor,或者将translucent设为YES,都不能使背景透明,经过一番研究,发现了一种超级简单和实用的?法:[[searchbar.subviews objectAtIndex:0] removeFromSuperview];背景完全消除了,只剩下搜索框本身了。 20、图像与缓存 :UIImageView *wallpaper = [[UIImageView alloc] initWithImage: [UIImage imageNamed:@"icon.png"]]; // 会缓存图片UIImageView *wallpaper = [[UIImageView alloc] initWithImage: [UIImage imageWithContentsOfFile:@"icon.png"]]; // 不会缓存图?片 21、iphone对视图层的操作// 将textView的边框设置为圆角_textView.layer.cornerRadius = 8;_textView.layer.masksToBounds = YES;//给textView添加一个有色边框_textView.layer.borderWidth = 5;_textView.layer.borderColor = [[UIColor colorWithRed:0.52 green:0.09blue:0.07 alpha:1] CGColor]; //textView添加背景图片_textView.layer.contents = (id)[UIImage imageNamed:@"31"].CGImage; 22、关闭当前应用[[UIApplication sharedApplication] performSelector:@selector(terminateWithSuccess)]; 23、给iPhone程序添加欢迎界面1、将你需要的欢迎界面的图片,存成Default.png [NSThread sleepForTimeInterval:10.0]; 这样欢迎页面就停留10秒后消失了。 24、NSString NSDate转换NSString* myString= @"testing";NSData* data=[myString dataUsingEncoding: [NSString defaultCStringEncodi ng]];NSString* aStr =[[NSString alloc] initWithData:aData encoding:NSASCIIStringEncoding]; 25、UIWebView中的dataDetectorTypes 如果你希望在浏览页面时,页面上的电话号码显示成链接形式,点击电话号码就拨打电话,这时你就需要用到dataDetectorTypes了。 NSURL *url = [NSURL URLWithString:@"http://2015.iteye.com"]; NSURLRequest *requestObj = [NSURLRequest requestWithURL:url]; webView.dataDetectorTypes = UIDataDetectorTypePhoneNumber; [webView loadRequest:requestObj]; 26、打开苹果电脑浏览器的代码如您想在 Mac 软件中集成一键打开浏览器功能,可以使用以下代码 [[NSWorkspace sharedWorkspace] openURLs: urls withAppBundleIdentifier:@"com.apple.Safari"options: NSWorkspaceLaunchDefault additionalEventParamDescriptor: NULL launchIdentifiers: NULL]; 27、设置StatusBar以及NavigationBar的样式[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleBlackOpaque; self.navigationController.navigationBar.barStyle = UIBarStyleBlack; 28、隐藏Status Bar 你可能知道一个简易的方法,那就是在程序的viewDidLoad中加入以下代码: [UIApplication sharedApplication].statusBarHidden = YES; 此法可以隐藏状态条,但问题在于,状态条所占空间依然无法为程序所用。本篇介绍的方法依然简单,但更为奏效。通过简单的3个步骤,在plist中加入一 个键值来实现。1. 点击程序的Info.plist2. 右键点击任意一处,选择Add Row3. 加入的新键值,命名为UIStatusBarHidden或者Status bar is initially hidden,然后选上这一项。 29、产生随机数的最佳方案arc4random()会返回一个整型数,因此,返回1至100的随机数可以这样写: arc4random()%100 + 1; 30、string 和char转换 NSString *cocoaString = [[NSString alloc] initWithString:@"MyString"];const char *myCstring = [cocoaString cString];const char *cString = "Hello";NSString *cocoString = [[NSString alloc] initWithCString:cString]; 31、用UIWebView在当前程序中打开网页 如果URL中带中文的话,必须将URL中的中文转成URL形式的才行。NSString *query = [NSString stringWithFormat:@"http://www.baidu.com?q=苹 果"];NSString *strUrl = [query stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];NSURL *url = [NSURL URLWithString:strUrl];NSURLRequest *requestObj = [NSURLRequest requestWithURL:url]; [webView loadRequest:requestObj]; 32、阻止ios设备锁屏 [[UIApplication sharedApplication] setIdleTimerDisabled:YES];或 [UIApplication sharedApplication].idleTimerDisabled = YES; 33、一条命令卸载Xcode和 iPhone SDKsudo /Developer/Library/uninstall-devtools --mode=all 34、获取按钮的title-(void)btnPressed:(id)sender {NSString *title = [sender titleForState:UIControlStateNormal]; NSString *newText = [[NSString alloc] initWithFormat:@"%@",title]; label.text = newText;[newText release]; } 35、NSDate to NSStringNSString *dateStr = [[NSString alloc] initWithFormat:@"%@", date];或者NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];NSString *strDate = [dateFormatter stringFromDate:[NSDate date]];NSLog(@"%@", strDate); [dateFormatter release]; 36、图片由小到大缓慢显示的效果UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];[imageView setImage:[UIImage imageNamed:@"4.jpg"]]; self.ANImageView = imageView;[self.view addSubview:imageView];[imageView release];CGContextRef context = UIGraphicsGetCurrentContext(); [UIView beginAnimations:nil context:context];[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; [UIView setAnimationDuration:2.5];CGImageRef img = [self.ANImageView.image CGImage];[ANImageView setFrame:CGRectMake(0, 0, CGImageGetWidth(img), CGImageGetHeight(img))];[UIView commitAnimations]; NSLog(@"%lu",CGImageGetWidth(img));NSLog(@"%lu",CGImageGetHeight(img)); 37、数字转字符串NSString *newText = [[NSString alloc] initWithFormat:@"%d",number]; numberlabel.text = newText;[newText release]; 38、随机函数arc4random() 的使用.在iPhone中,RAND_MAX是0x7fffffff (2147483647),而arc4random()返回的 最大值则是 0x100000000 (4294967296),从而有更好的精度。使用 arc4random()还不需要生成随机种子,因为第一次调用的时候就会自动生成。如:arc4random() 来获取0到100之间浮点数#define ARC4RANDOM_MAX 0x100000000double val = floorf(((double)arc4random() / ARC4RANDOM_MAX) * 100.0f);1. self.view.backgroundColor = [UIColor colorWithHue: arc4random() % 2 55 / 2552. 3. 4.saturation: arc4random() % 2 brightness: arc4random() % 2alpha: 1.0]; 39、改变键盘颜色的实现iPhone和iPod touch的键盘颜色其实是可以通过代码更改的,这样能更匹配 App的界面风格,下面是改变iPhone键盘颜?色的代码。-(void)textFieldDidBeginEditing:(UITextField *)textField {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:@"UIPeripheralHostView"]){v.backgroundColor = [UIColor blueColor];} }} }55 / 255 55 / 255_textField.keyboardAppearance = UIKeyboardAppearanceAlert;//有这个设置属性 才起作用 40、iPhone上实现Default.png动画 添加一张和Default.png?一样的图片,对这个图片进行动画,从而实现Default动画的渐变消 失的效果。UIImageView *splashView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];splashView.image = [UIImage imageNamed:@"Default.png"];[self.window addSubview:splashView];[self.window bringSubviewToFront:splashView];[UIView beginAnimations:nil context:nil];[UIView setAnimationDuration:2.0];[UIView setAnimationTransition:UIViewAnimationTransitionNone forView:self.window cache:YES];[UIView setAnimationDelegate:self];[UIView setAnimationDidStopSelector:@selector(startupAnimationDone:finished:cont ext:)];splashView.alpha = 0.0;splashView.frame = CGRectMake(-60, -85, 440, 635); [UIView commitAnimations]; 41、将EGO主题色添加到xcode中 打开终端,执行以下命令Shell代码1. mkdir -p ~/Library/Application\ Support/Xcode/Color\ Themes; 2. cd ~/Library/Application\ Support/Xcode/Color\ Themes;3. curl -O http://developers.enormego.com/assets/egotheme/EGO.xccolortheme然后,重启Xcode,选择Preferences > Fonts & Colors,最后从Color Theme 中选择EGO即可。 42、将图片保存到图片库中-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {UITouch *touch = [touches anyObject]; if ([touch tapCount]== 1){UIImageWriteToSavedPhotosAlbum([ANImageView image], nil, nil, nil);UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"存储照?片 message:@"您已将照?存于图片库中,打开照片程序即可查" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show];[alert release];} } 43、读取plist文件//取得文件路径NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"文件名" ofType:@"plist"];//读取到一个字典NSDictionary *dictionary = [[NSDictionary alloc] initWithContentsOfFile:plistPath];//读取到一个数组NSArray *array = [[NSArray alloc] initWithContentsOfFile:plistPath]; 44、使用#pragma mark 加上这样的标识后,在导航条上会显示源文件上方法列表,这样就可对功能相关的方法进行分隔,方便查看了。设置UITabBarController默认的启动Item //a tabBarUITabBarController *tabBarController = [[UITabBarController alloc] init];NSArray *controllers = [NSArray arrayWithObjects: nav1, nav2, nav3, nav4, nil];tabBarController.viewControllers = controllers; tabBarController.selectedViewController = nav2; 45、NSUserDefaults的使用NSUserDefaults *store = [NSUserDefaults standardUserDefaults]; NSUInteger selectedIndex = 1;[store setInteger:selectedIndex forKey:@"selectedIndex"];if ([store valueForKey:@"selectedIndex"] != nil) {NSInteger index = [store integerForKey:@"selectedIndex"]; NSLog(@"?用户已经设置的selectedIndex的值是:%d", index);} else { NSLog(@"请设置默认的值");} 46、更改Xcode的缺省公司名 在终端中执行以下命令:defaults write com.apple.Xcode PBXCustomTemplateMacroDefiniti ons '{"ORGANIZATIONNAME" = "COMPANY";}' 47、设置uiView,成圆角矩形 画个圆角的矩形没啥难的,有两种方法:1 。直接修改view的样式,系统提供好的了:view.layer.cornerRadius = 6;view.layer.masksToBounds = YES; 用layer做就可以了,十分简单。这个需要倒库 QuartzCore.framework;2. 在view 里面画圆角矩形 CGFloat radius = 20.0;CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1);CGFloat minx = CGRectGetMinX(rect), midx = CGRectGetMidX(rect), maxx =CGRectGetMaxX(rect);CGFloat miny = CGRectGetMinY(rect), midy = CGRectGetMidY(rect), maxy =CGRectGetMaxY(rect);CGContextMoveToPoint(context, minx, midy); CGContextAddArcToPoint(context, minx, miny, midx, miny, radius); CGContextAddArcToPoint(context, maxx, miny, maxx, midy, radius); CGContextAddArcToPoint(context, maxx, maxy, midx, maxy, radius); CGContextAddArcToPoint(context, minx, maxy, minx, midy, radius); CGContextClosePath(context);CGContextDrawPath(context, kCGPathFill);用画笔的方法,在drawRect里面做。 48、画图时图片倒转解决方法CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSaveGState(context);CGContextTranslateCTM(context, 0, self.bounds.size.height); CGContextScaleCTM(context, 1, -1);drawImage = [UIImage imageNamed:@"12.jpg"];CGImageRef image = CGImageRetain(drawImage.CGImage);CGContextDrawImage(context, CGRectMake(30.0, 200, 450, 695), image); CGContextRestoreGState(context); 49、Nsstring 自适应文本宽高度CGSize feelSize = [feeling sizeWithFont:[UIFont systemFontOfSize:12]constrainedToSize:CGSizeMake(190, 200)];float feelHeight = feelSize.height; 50、用HTTP协议,获取www.baidu.com网站的HTML数据:[NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://www.baidu.com"]]; 51、viewDidLoad中设置按钮图案UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];button.frame = CGRectMake(0, 0, 60, 30);[button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:button]; UIImage *buttonImageNormal = [UIImage imageNamed:@"huifu-001.png"];UIImage *stretchableButtonImageNormal = [buttonImageNormalstretchableImageWithLeftCapWidth:12 topCapHeight:0]; [button setBackgroundImage:stretchableButtonImageNormal forState:UIControlStateNormal]; UIImage *buttonImagePressed = [UIImage imageNamed:@"qyanbuhuifu-001.png"];UIImage *stretchableButtonImagePressed = [buttonImagePressed stretchableImageWithLeftCapWidth:12 topCapHeight:0]; [button setBackgroundImage:stretchableButtonImagePressed forState:UIControlStateHighlighted];52、键盘上的return键改成Done: textField.returnKeyType = UIReturnKeyDone; 53、textfield设置成为密码框: [textField_pwd setSecureTextEntry:YES]; 54、收回键盘: [textField resignFirstResponder]; 或者 [textfield addTarget:self action:@selector(textFieldDone:) forControlEvents:UIControlEventEditin gDidEndOnExit];55、振动:#import<AudioToolbox/AudioToolbox.h> //需加头文件方法一: AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);方法二: AudioServicesPlaySystemSound(kSystemSoundID_Vibrate); 当设备不支持方法一函数时,起蜂鸣作用, 而方法二支持所有设备 56、用Cocoa删除文件:NSFileManager *defaultManager = [NSFileManager defaultManager]; [defaultManager removeFileAtPath: tildeFilename handler: nil]; 57、UIView透明渐变与移动效果://动画配制开始[UIView beginAnimations:@"animation" context:nil]; [UIView setAnimationDuration:2.5];//图片上升动画CGRect rect = imgView.frame ;rect.origin.y = 30;imgView.frame = rect;//半透明度渐变动画imgView.alpha = 0;//提交动画[UIView commitAnimations]; 58、在UIView的drawRect方法内,用Quartz2D API绘制一个像素宽的水平直线: -(void)drawRect:(CGRect)rect{//获取图形上下文CGContextRef context = UIGraphicsGetCurrentContext(); //设置图形上下文的路径绘制颜色 CGContextSetStrokeColorWithColor(context, [UIColorwhiteColor].CGColor); //取消防锯齿CGContextSetAllowsAntialiasing(context, NO); //添加线CGContextMoveToPoint(context, 50, 50); CGContextAddLineToPoint(context, 100, 50); //绘制CGContextDrawPath(context, kCGPathStroke); } 59、用UIWebView加载: www.baidu.comUIWebView *web = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];[web loadRequest:[NSURLRequest requestWithURL: [NSURL URLWithString:@"http://www.baidu.com"]]];[self.view addSubview:web]; [web release]; 60、利用UIImageView实现动画:- (void)viewDidLoad {[super viewDidLoad];UIImageView *fishAni=[[UIImageView alloc] initWithFrame: [[UIScreen mainScreen] bounds]];[self.view addSubview:fishAni]; [fishAni release];//设置动画帧fishAni.animationImages=[NSArray arrayWithObjects: [UIImage imageNamed:@"1.jpg"],[UIImage imageNamed:@"2.jpg"],[UIImage imageNamed:@"3.jpg"],[UIImage imageNamed:@"4.jpg"],[UIImage imageNamed:@"5.jpg"],nil ];//设置动画总时间 fishAni.animationDuration=1.0;//设置重复次数,0表示不重复 fishAni.animationRepeatCount=0;//开始动画[fishAni startAnimating]; } 61、用NSTimer做一个定时器,每隔1秒执行一次 pressedDone; -(IBAction)clickBtn:(id)sender{NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(printHello) userInfo:nil repeats:YES]; [timer fire]; } 62、利用苹果机里的相机进行录像:-(void) choosePhotoBySourceType: (UIImagePickerControllerCameraCaptureMode) sourceType {m_imagePickerController = [[[UIImagePickerController alloc] init] autorelease];m_imagePickerController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;m_imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera; m_imagePickerController.cameraDevice =UIImagePickerControllerCameraDeviceFront; //m_imagePickerController.cameraCaptureMode =UIImagePickerControllerCameraCaptureModeVideo;NSArray *sourceTypes = [UIImagePickerController availableMediaTypesForSourceType:m_imagePickerController.sourceType];if ([sourceTypes containsObject:(NSString *)kUTTypeMovie ]) {m_imagePickerController.mediaTypes= [NSArray arrayWithObjects: (NSString *)kUTTypeMovie,(NSString *)kUTTypeImage,nil];}// m_imagePickerController.cameraCaptureMode = sourceType; //m_imagePickerController.mediaTypes //imagePickerController.allowsEditing = YES;[self presentModalViewController: m_imagePickerController animated:YES]; } -(void) takePhoto {if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){[self choosePhotoBySourceType:nil];} }// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.- (void)viewDidLoad {[super viewDidLoad];UIButton *takePhoto = [UIButtonbuttonWithType:UIButtonTypeRoundedRect];[takePhoto setTitle:@"录像" forState:UIControlStateNormal]; [takePhoto addTarget:self action:@selector(takePhoto) forControlEvents:UIControlEventTouchUpInside]; takePhoto.frame = CGRectMake(50,100,100,30); [self.view addSubview:takePhoto];}63、App中调用 iPhone的home + 电源键截屏功能 // 前置声明是消除警告CGImageRef UIGetScreenImage();CGImageRef img = UIGetScreenImage();UIImage* scImage=[UIImage imageWithCGImage:img]; UIImageWriteToSavedPhotosAlbum(scImage, nil, nil, nil); 64、切割图片的方法//切割图片UIImage *image = [UIImage imageNamed:@"7.jpg"];//设置需要截取的?大?小CGRect rect = CGRectMake(20, 50, 280, 200);//转换CGImageRef imageRef = image.CGImage;//截取函数CGImageRef imageRefs = CGImageCreateWithImageInRect(imageRef, rect); //生成uIImageUIImage *newImage = [[UIImage alloc] initWithCGImage:imageRefs]; //添加到imageView中imageView = [[UIImageView alloc] initWithImage:newImage]; imageView.frame = rect; 65、如何屏蔽父view的touch事件-(UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{CGMutablePathRef path = CGPathCreateMutable(); CGPathMoveToPoint(path,NULL,0,0);CGRect rect = CGRectMake(0, 100, 320, 40); CGPathAddRect(path, NULL, rect); if(CGPathContainsPoint(path, NULL, point, NO)) {[self.superview touchesBegan:nil withEvent:nil]; }CGPathRelease(path);return self; } 66、用户按home键推送通知UIApplication *app = [UIApplication sharedApplication]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(pressHome:) name:UIApplicationDidEnterBackgroundNotification object:app];-(void)pressHome:(NSNotification *)notification {NSLog(@"pressHome..."); } 67、在UIImageView中旋转图像:float rotateAngle = M_PI; //M_PI为一角度CGAffineTransform transform =CGAffineTransformMakeRotation(rotateA ngle);imageView.transform = transform; 68、隐藏状态栏:方法一, [UIApplication sharedApplication] setStatusBarHidden:YES animated:NO]; 方法二, 在应用程序的Info.plist 文件中将 UIStatusBarHidden 设置为YES; 69、构建多个可拖动视图:@interface DragView: UIImageView{CGPoint startLocation;NSString *whichFlower; }@property (nonatomic ,retain)NSString *whichFlower; @end@implementation DragView@synthesize whichFlower; - (void) touchesBegan:(NSSet *)touches withEvent: (UIEvent *)event{ CGPoint pt = [[touhes anyObject ] locationInView:self]; startLocation = pt;[[self superview] bringSubviewToFront:self];}- (void) touchesMoved:(NSSet *)touches withEvent:( UIEvent *)event{CGPoint pt = [[touches anyObject] locatonInView:self]; CGRect frame = [self frame];frame.origin.x += pt.x – startLocation.x;frame.origin.y += pt.y - startLocation.y;[self setFrame:frame]; }@end@interface TestController :UIViewController{UIView *contentView;}@end@implementation TestController#define MAXFLOWERS 16CGPoint randomPoint(){ return CGPointMake(random()%6 , random()96);}- (void)loadView{CGRect apprect = [[UIScreen mainScreen] applicationFrame]; contentView = [[UIView alloc] initWithFrame :apprect]; contentView.backgroundColor = [UIColor blackColor]; self.view = contentView;[contentView release];for(int i=0 ; i<MAXFLOWERS; i++){CGRect dragRect = CGRectMake(0.0f ,0.0f, 64.0f ,64.0f); dragRect.origin = randomPoint();DragView *dragger = [[DragView alloc] initWithFrame:dragRect]; [dragger setUserInteractionEnabled: YES];NSString *whichFlower = [[NSArray arrayWithObjects:@”blueFlower.png”,@”pinkFlower.png”,nil] objectAtIndex: ( random() %2)];[dragger setImage:[UIImage imageNamed:whichFlower]]; [contentView addSubview :dragger];[dragger release];} }- (void)dealloc{ [contentView release];[super dealloc]; }@end 70、iPhone中加入dylib库加入dylib库时,必须在info中加入头文件路径。/usr/include/库名(不要后缀) 71、iPhone iPad 中App名字如何支持多语言和显示自定义名字建立InfoPlist.strings,本地化此文件,然后在文件内添加: CFBundleDisplayName = "xxxxxxxxxxx"; //这样应?用程序就能显示成设置的名字“xxxxxxxxxxx”. 72、在数字键盘上添加button://定义一个消息中心[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil]; //addObserver:注册一个观察员 name:消息名称- (void)keyboardWillShow:(NSNotification *)note {// create custom buttonUIButton *doneButton = [UIButton buttonWithType:UIButtonTypeCustom]; doneButton.frame = CGRectMake(0, 163, 106, 53);[doneButton setImage:[UIImage imageNamed:@"5.png"]forState:UIControlStateNormal];[doneButton addTarget:self action:@selector(addRadixPoint) forControlEvents:UIControlEventTouchUpInside];// locate keyboard viewUIWindow* tempWindow = [[[UIApplication sharedApplication] windows] objectAtIndex:1];//返回应用程序windowUIView* keyboard;for(int i=0; i<[tempWindow.subviews count]; i++) //遍历window上的所有 subview{keyboard = [tempWindow.subviews objectAtIndex:i];// keyboard view found; add the custom button to it if([[keyboard description] hasPrefix:@"<UIKeyboard"] == YES) [keyboard addSubview:doneButton];} }73、去掉iPhone应用图标上的弧形高光 有时候我们的应用程序不需要在图标上加上默认的高光,可以在你的应用的 Info.plist中加入:Icon already includes gloss effects YES 74、实现修改navigation的back按钮 self.navigationItem.backBarButtonItem =[[[UIBarButtonItem alloc] initWithTitle: NSLocalizedStringFromTable (@"返回", @"System", nil) style:UIBarButtonItemStyleBordered target:nil action:nil] autorelease]; 75、给图片加上阴影UIImageView*pageContenterImageView = [[UIImageView alloc]initWithImage: [UIImage imageNamed:@"onePageApple.png"]];//添加边框CALayer*layer = [pageContenterImageView layer];layer.borderColor= [[UIColor whiteColor]CGColor];layer.borderWidth=0.0f;//添加四个边阴影pageContenterImageView.layer.shadowColor= [UIColor blackColor].CGColor;pageContenterImageView.layer.shadowOffset=CGSizeMake(0,0); pageContenterImageView.layer.shadowOpacity=0.5; pageContenterImageView.layer.shadowRadius=5.0; 阴影渲染会严重消耗内存 ,导致程序咔叽./*阴影效果*///添加边框CALayer*layer = [self.pageContenter layer];layer.borderColor= [[UIColorwhiteColor]CGColor];layer.borderWidth=0.0f;//添加四个边阴影self.pageContenter.layer.shadowColor= [UIColorblackColor].CGColor;//阴影颜色self.pageContenter.layer.shadowOffset=CGSizeMake(0,0);//阴影偏移 self.pageContenter.layer.shadowOpacity=0.5;//阴影不透明度 self.pageContenter.layer.shadowRadius=5.0;//阴影半径?二、给视图加上阴影UIView * content=[[UIView alloc] initWithFrame:CGRectMake(100, 250, 503, 500)];content.backgroundColor=[UIColor orangeColor];//content.layer.shadowOffset=10;content.layer.shadowOffset = CGSizeMake(5, 3); content.layer.shadowOpacity = 0.6; content.layer.shadowColor = [UIColor blackColor].CGColor;[self.window addSubview:content]; 76、UIView有一个属性,clipsTobounds 默认情况下是NO, 如果,我们想要view2把超出的那部份隐藏起来的话,就得改变它的父视图也 就view1的clipsTobounds属性值。view1.clipsTobounds = YES;使用objective-c 建立UUID UUID是128位的值,它可以保证唯一性。通常,它是由机器本身网卡的MAC地址和当前系统时间来生成的。 UUID是由中划线连接而成的字符串。例如:0A326293-BCDD-4788-8F2D-C4D8E53C108B在声明文件中声明一个方法:#import <UIKit/UIKit.h>@interface UUIDViewController : UIViewController { }- (NSString *) createUUID;@end对应的实现文件中实现该方法:- (NSString *) createUUID {CFUUIDRef uuidObject = CFUUIDCreate(kCFAllocatorDefault);NSString *uuidStr = (NSString *)CFUUIDCreateString(kCFAllocatorDefault, uuidObject);CFRelease(uuidObject);return uuidStr; } 77、iPhone iPad中横屏显示代码 1、强制横屏[application setStatusBarOrientation:UIInterfaceOrientationLandscapeRight animated:NO];2、在infolist?里?面加了Supported interface orientations这?一项,增加之后添加四个item就是 ipad的四个?方向item0 UIInterfaceOrientationLandscapeLeftitem1 UIInterfaceOrientationLandscapeRight 这表明只?支持横屏显?示 经常让人混淆迷惑的问题 - 数组和其他集合类 78、当一个对象被添加到一个array, dictionary, 或者 set等这样的集合类型中的时候,集合会retain它。 对应 的,当集合类被release的时候,它会发送对应的release消息给包含在其中的对象。 因此,如果你想建立一 个包含一堆number的数组,你可以像下面示例中的几个方法来做NSMutableArray *array; int i;// ...for (i = 0; i < 10; i++) {NSNumber *n = [NSNumber numberWithInt: i];[array addObject: n]; }在这种情况下, 我们不需要retain这些number,因为array将替我们这么做。 NSMutableArray *array;int i;// ...for (i = 0; i < 10; i++) {NSNumber *n = [[NSNumber alloc] initWithInt: i]; [array addObject: n];[n release];}在这个例子中,因为你使用了-alloc去建立了一个number,所以你必须显式的-release它,以保证retain count的平衡。因为将number加入数组的时候,已经retain它了,所以数组中的number变量不会被release 79、UIView动画停止调用方法遇到的问题在实现UIView的动画的时候,并且使?用UIView来重复调?用它结束的回调时候要 注意以下?方法中的finished参数-(void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context{if([finishied boolValue] == YES)//一定要判断这句话,要不在程序中当多个View刷新的时候,就可能出现动画异常的现象 {//执行想要的动作 }} 80、判断在UIViewController中,viewWillDisappear的时候是push还是 pop出来- (void)viewWillDisappear:(BOOL)animated {NSArray *viewControllers = self.navigationController.viewControllers; if (viewControllers.count > 1 && [viewControllersobjectAtIndex:viewControllers.count-2] == self) {// View is disappearing because a new view controller was pushed onto thestackNSLog(@"New view controller was pushed");} else if ([viewControllers indexOfObject:self] == NSNotFound) { // View is disappearing because it was popped from the stack NSLog(@"View controller was popped");} } 81、连接字符串小技巧NSString *string1 = @"abc / cde";NSString *string2 = @"abc" @"cde";NSString *string3 = @"abc" "cde";NSLog( @"string1 is %@" , string1 ); NSLog( @"string2 is %@" , string2 ); NSLog( @"string3 is %@" , string3 ); 打印结果如下:string1 is abc cde string2 is abccde 82、随文字大小label自适应label=[[UILabel alloc] initWithFrame:CGRectMake(50, 23, 175, 33)];label.backgroundColor = [UIColor purpleColor];[label setFont:[UIFont fontWithName:@"Helvetica" size:30.0]]; [label setNumberOfLines:0];//[myLable setBackgroundColor:[UIColor clearColor]]; [self.window addSubview:label];NSString *text = @"this is ok";UIFont *font = [UIFont fontWithName:@"Helvetica" size:30.0];CGSize size = [text sizeWithFont: font constrainedToSize: CGSizeMake(175.0f, 2000.0f) lineBreakMode: UILineBreakModeWordWrap];CGRect rect= label.frame; rect.size = size;[label setFrame: rect]; [label setText: text]; 83、UILabel字体加粗//加粗lb.font = [UIFont fontWithName:@"Helvetica-Bold" size:20]; //加粗并且倾斜lb.font = [UIFont fontWithName:@"Helvetica-BoldOblique" size:20]; 84、为IOS应用组件添加圆角的方法 具体的实现是使用QuartzCore库,下面我具体的描述一下实现过程:? 首先创建一个项目,名字叫:ipad_webwiew? 利?用Interface Builder添加?一个UIWebView,然后和相应的代码相关联 ? 添加QuartzCore.framework代码实现: 头?文件:#import <UIKit/UIKit.h>#import <QuartzCore/QuartzCore.h>@interface ipad_webwiewViewController : UIViewController {IBOutlet UIWebView *myWebView; UIView *myView;}@property (nonatomic,retain) UIWebView *myWebView; @end代码实现:- (void)viewDidLoad {[super viewDidLoad]; //给图层添加背景图?片: //myView.layer.contents = (id)[UIImageimageNamed:@"view_BG.png"].CGImage; //将图层的边框设置为圆脚myWebView.layer.cornerRadius = 8; myWebView.layer.masksToBounds = YES; //给图层添加?一个有?色边框myWebView.layer.borderWidth = 5; myWebView.layer.borderColor = [[UIColor colorWithRed:0.52green:0.09 blue:0.07 alpha:1] CGColor]; } 85、实现UIToolBar的自动消失 -(void)showBar{! [UIView beginAnimations:nil context:nil];! [UIView setAnimationDuration:0.40];! (_toolBar.alpha == 0.0) ? (_toolBar.alpha = 1.0) : (_toolBar.alpha = 0.0);! [UIView commitAnimations];}- (void)viewDidAppear:(BOOL)animated {[NSObject cancelPreviousPerformRequestsWithTarget: self];[self performSelector: @selector(delayHideBars) withObject: nil afterDelay: 3.0];}- (void)delayHideBars { [self showBar];} 86、自定义UINavigationItem.rightBarButtonItemUISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:@"remote",@"mouse",@"text",nil]];[segmentedControl insertSegmentWithImage:[UIImage imageNamed:@"home_a.png"] atIndex:0 animated:YES];[segmentedControl insertSegmentWithImage:[UIImage imageNamed:@"myletv_a.png"] atIndex:1 animated:YES];segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar; segmentedControl.frame = CGRectMake(0, 0, 200, 30); [segmentedControl setMomentary:YES];[segmentedControl addTarget:self action:@selector(segmentAction:)forControlEvents:UIControlEventValueChanged];UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl];self.navigationItem.rightBarButtonItem = barButtonItem; [segmentedControl release];UINavigationController直接返回到根viewController [self.navigationController popToRootViewControllerAnimated:YES];想要从第五层直接返回到第二层或第三层,用索引的形式[self.navigationController popToViewController: [self.navigationController.viewControllers objectAtIndex: ([self.navigationController.viewControllers count] - 2)] animated:YES]; 87、键盘监听事件#ifdef __IPHONE_5_0float version = [[[UIDevice currentDevice] systemVersion] floatValue];if (version >= 5.0){[[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(keyboardWillShow:) name:UIKeyboardWillChangeFrameNotification object:nil];}#endif[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];-(void)keyboardWillShow:(NSNotification *)notification {NSValue *value = [[notification userInfo] objectForKey:@"UIKeyboardFrameEndUserInfoKey"];CGRect keyboardRect = [value CGRectValue]; NSLog(@"value %@ %f",value,keyboardRect.size.height); [UIView beginAnimations:nil context:nil];[UIView setAnimationDuration:0.25];keyboardHeight = keyboardRect.size.height; self.view.frame = CGRectMake(0, -(251 - (480 - 64 -keyboardHeight)), self.view.frame.size.width, self.view.frame.size.height);[UIView commitAnimations]; } 88、 ios6.0强制横屏的方法:在appDelegate里调用if (!UIDeviceOrientationIsLandscape([[UIDevice currentDevice] orientation])) { [[UIApplication sharedApplication]setStatusBarOrientation:UIInterfaceOrientationLandscapeRight animated:NO]; }
