UIViewController新方法的使用(transitionFromViewController:toViewController:duration:options:animations:completion:)

iOS5中，UIViewController新添加了几个方法：

- (void)addChildViewController:(UIViewController *)childController NS_AVAILABLE_IOS(5_0);
- (void) removeFromParentViewController NS_AVAILABLE_IOS(5_0);

- (void)transitionFromViewController:(UIViewController *)fromViewController toViewController:(UIViewController *)toViewController duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(5_0);

- (void)willMoveToParentViewController:(UIViewController *)parent NS_AVAILABLE_IOS(5_0);
- (void)didMoveToParentViewController:(UIViewController *)parent NS_AVAILABLE_IOS(5_0);

代码示例：

代码结构：



其中，MainViewController添加为window的rootViewController，FirstViewController、SecondViewController、ThirdViewController就是三个简单的controller，设置不同的背景色即可,MainViewController的xib文件如下图：



MainViewController的viewDidLoad方法实现如下：

- (void)viewDidLoad
{
[super viewDidLoad];

FirstViewController * firstController = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
[self addChildViewController:firstController];

SecondViewController * secondController = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
[self addChildViewController:secondController];

ThirdViewController * thirdController = [[ThirdViewController alloc] initWithNibName:@"ThirdViewController" bundle:nil];
[self addChildViewController:thirdController];

[contentView addSubview:firstController.view];//用于显示其它controller的view
currentController = firstController;
}

三个button的响应方法如下：

- (IBAction)onButtonClick:(id)sender {
FirstViewController * firstController = self.childViewControllers[0];
SecondViewController * secondController = self.childViewControllers[1];
ThirdViewController * thirdController = self.childViewControllers[2];
NSInteger tag = ((UIButton *) sender).tag;
if ((currentController == firstController && tag == 1) || (currentController == secondController && tag == 2) || (currentController == thirdController && tag == 3)) {
return;
}

UIViewController * oldController = currentController;

switch (tag) {
case 1:{

[self transitionFromViewController:currentController toViewController:firstController duration:1 options:UIViewAnimationOptionTransitionFlipFromLeft animations:^{} completion:^(BOOL finished) {
if (finished) {
currentController = firstController;
}
else {
currentController = oldController;
}
}];
break;
}

case 2: {
[self transitionFromViewController:currentController toViewController:secondController duration:1 options:UIViewAnimationOptionTransitionFlipFromTop animations:^{} completion:^(BOOL finished) {
if (finished) {
currentController = secondController;
}
else {
currentController = oldController;
}
}];
break;
}

case 3:{
[self transitionFromViewController:currentController toViewController:thirdController duration:1 options:UIViewAnimationOptionTransitionFlipFromBottom animations:^{} completion:^(BOOL finished) {
if (finished) {
currentController = thirdController;
}
else {
currentController = oldController;
}
}];
break;
}
default:
break;
}
}

效果图：