UIViewController切换动画效果设置

MyViewController *_myViewController = [[MyViewController alloc] init];
_myViewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController: _myViewController Animated: YES];
[_myViewController release];
 
有四种切换形式（modalTransitionStyle）：    
 UIModalTransitionStyleFlipHorizontal  //水平翻转
 UIModalTransitionStyleCoverVertical (default)  //从下到上 
 UIModalTransitionStyleCrossDissolve     //淡出
 UIModalTransitionStylePartialCurl //翻书
退回方法：[self dismissModalViewControllerAnimated:YES];