设置系统的viewController modal动画样式

controller.modalTransitionStyle =UIModalTransitionStyleCoverVertical;//设置动画样式
[self presentModalViewController:controller animated:YES];
[self dismissModalViewController Animated:YES];

- (void)transitionFromViewController:(UIViewController *)fromViewController 
                    toViewController:(UIViewController *)toViewController 
                            duration:(NSTimeInterval)duration 
                             options:(UIViewAnimationOptions)options 
                          animations:(void (^)(void))animations 
                          completion:(void (^)(BOOL))completion{
    //在此处可以重写ViewController的动画样式
}