view隐藏和显示的动画效果
有个view，平时是隐藏的，点击一个按钮后，在当前view中把那个隐藏的view显示出来，再点击隐藏起来，如何加入动画效果？

[解决办法]
加入动画不会。。。

[self presentModalViewController:<#(UIViewController *)modalViewController#> animated:<#(BOOL)animated#>]


实现页面跳转，把那个页面跳出来

再通过【self dismiss、。。】的方法把页面跳回去 可以进行系统自带动画
[解决办法]

C/C++ code

    #import <QuartzCore/QuartzCore.h>            ViewController *controller = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];            controller.modalTransitionStyle=kCALayerRightEdge;               //controller.modalTransitionStyle=kCALayerRightEdge;            //controller.modalTransitionStyle=kCALayerLeftEdge;            //controller.modalTransitionStyle=kCALayerBottomEdge;            //controller.modalTransitionStyle=kCALayerTopEdge;            //controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;            //controller.modalTransitionStyle=UIModalTransitionStyleCrossDissolve;            //controller.modalTransitionStyle=UIModalTransitionStyleCoverVertical;            //controller.modalTransitionStyle=UIModalTransitionStylePartialCurl;            //controller.modalTransitionStyle=kCATransitionPush;            //controller.modalPresentationStyle = UIModalPresentationCurrentContext;            //controller.modalInPopover=UIPopoverArrowDirectionRight;            //controller.modalInPopover=UIPopoverArrowDirectionLeft;            ///controller.modalTransitionStyle=UIViewAnimationOptionTransitionCurlUp;            //controller.modalPresentationStyle = UIModalPresentationFormSheet;            [self presentModalViewController:controller animated:YES];
[解决办法]
[UIView beginAnimations:nil context:nil];
button.alpha = 1.0;
[UIView commitAnimations];