本文原始地址:IOS 5新增API介绍及使用
1.UIStepper
UIStepper *stepper = [[UIStepper alloc] initWithFrame:CGRectMake(200, 100, 0, 0)]; [stepper sizeToFit]; stepper.value = 0; stepper.minimumValue = 0; stepper.maximumValue = 1; stepper.stepValue = 0.1; [stepper addTarget:self action:@selector(stepperAction:) forControlEvents:UIControlEventValueChanged]; [self.view addSubview:stepper]; [stepper release];
- (void)stepperAction:(UIStepper *)stepper { NSLog(@"stepper value:%f",stepper.value); }
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Hello" message:@"Hello World" delegate:nil cancelButtonTitle:nil otherButtonTitles:nil, nil]; //第一张图 alert.alertViewStyle = UIAlertViewStylePlainTextInput; //第二张图 alert.alertViewStyle = UIAlertViewStyleLoginAndPasswordInput; //第三张图 alert.alertViewStyle = UIAlertViewStyleSecureTextInput; [alert show]; [alert release];
//返回指定索引值的TextField ,这个API仅存在于IOS5.0以上 - (UITextField *)textFieldAtIndex:(NSInteger)textFieldIndex { return textField; }
UIScreen *mainScreen = [UIScreen mainScreen]; //设置屏幕亮度为50% mainScreen.brightness = 0.5; //默认是NO。如果YES,可以通过wantsSoftwareDimming属性来声明此应用需要将屏幕亮度调整到比中等亮度偏暗的级别。(需要注意的是,打开wantsSoftwareDimming可能会对性能有影响,因为这种昏暗是通过软件来实现的。) mainScreen.wantsSoftwareDimming = YES;4 UIReferenceLibraryViewController显示词语解释
NSString *key = @"hello"; //判断任何已经安装的字典里有key的定义 if ([UIReferenceLibraryViewController dictionaryHasDefinitionForTerm:key]) { UIReferenceLibraryViewController *controller = [[UIReferenceLibraryViewController alloc] initWithTerm:key]; //只是切换方式 [controller setModalTransitionStyle:UIModalTransitionStyleCrossDissolve]; [self presentModalViewController:controller animated:YES]; [controller release]; }5.UISplitViewController delegate,显示隐藏时delegate
//这个delegate方法是被发送到你的delegate询问在特定方向下你想要左侧做什么,因此它把自己传递给你,还有左侧,它会问在这个方向你想要我对左侧做什么。要隐藏就返回YES,要保留在屏幕上就返回NO - (BOOL)splitViewController:(UISplitViewController *)svc shouldHideViewController:(UIViewController *)vc inOrientation:(UIInterfaceOrientation)orientation { return YES; }6.从xib文件中获取cell
//为tableview注册一个nib UINib *nib = [UINib nibWithNibName:@"MyCell" bundle:nil]; [self.tableView registerNib:nib forCellReuseIdentifier:@"identifier"];
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { //重用前面注册过的cell UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"identifier"]; //other code return cell; }7 UIImage,image动画
//程序中所有slider改为红色 [[UISlider appearance] setMinimumTrackTintColor:[UIColor redColor]];9 UIPageViewController
self.view.backgroundColor = [UIColor whiteColor]; self.assetsLibrary = [[ALAssetsLibrary alloc] init]; dispatch_queue_t dispatchQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); dispatch_async(dispatchQueue, ^(void) { // 遍历所有相册 [self.assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) { // 遍历每个相册中的项ALAsset [group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index,BOOL *stop) { __block BOOL foundThePhoto = NO; if (foundThePhoto) { *stop = YES; } // ALAsset的类型 NSString *assetType = [result valueForProperty:ALAssetPropertyType]; //如果是照片的话 //ALAssetTypeVideo //ALAssetTypeUnknown if ([assetType isEqualToString:ALAssetTypePhoto]) { foundThePhoto = YES; *stop = YES; //封装了ALAsset,包含了一个资源文件中的很多属性。(可以说是ALAsset的不同的表示方式,本质上都表示同一个资源文件) ALAssetRepresentation *assetRepresentation = [result defaultRepresentation]; CGFloat imageScale = [assetRepresentation scale]; UIImageOrientation imageOrientation = (UIImageOrientation)[assetRepresentation orientation]; dispatch_async(dispatch_get_main_queue(), ^(void) { CGImageRef imageReference = [assetRepresentation fullResolutionImage]; // 对找到的图片进行操作 UIImage *image = [[UIImage alloc] initWithCGImage:imageReference scale:imageScale orientation:imageOrientation]; if (image != nil) { //呈现 self.imageView = [[UIImageView alloc] initWithFrame:self.view.bounds]; self.imageView.contentMode = UIViewContentModeScaleAspectFit; self.imageView.image = image; [self.view addSubview:self.imageView]; } else { NSLog(@"Failed to create the image."); } }); } }]; } failureBlock:^(NSError *error) { //读取失败的处理 }]; });