视图控制器之间的切换

两个UIView之间的翻转可以用动画效果翻转(上下，左右)

    UIViewController之间的切换除了UINavigationController里面的pushViewController和popViewController与UITalbarController在viewControllers之间的切换外， 我们还可以在其他地方自由的进行ViewController切换：

MyViewController *_myViewController = [[MyViewController alloc] init];

_myViewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;

[self presentModalViewController: _myViewController Animated: YES];

[_myViewController release];

 

有四种切换形式（modalTransitionStyle）：    

 UIModalTransitionStyleFlipHorizontal  

 UIModalTransitionStyleCoverVertical (default)   

 UIModalTransitionStyleCrossDissolve    

 UIModalTransitionStylePartialCurl
退回方法：[self dismissModalViewControllerAnimated:YES];

与此对应的是播放视频时：

 [self presentMediaPlayerViewController:moviePlayer Animated:YES];

 [self dismissMediaPlayerViewControllerAnimated:YES];