近期想做一个跑马灯的效果，于是写出了如下的跑马灯效果的代码。。。但是调试发现，在iOS6下动画是可以执行的，但是在iOS7下动画并不执行，没有达到预期的效果。
[_scrollLabel sizeToFit];
CGRect frame = _scrollLabel.frame;
frame.origin.x = 320;
_scrollLabel.frame = frame;
[UIView setAnimationsEnabled:YES];
[UIView beginAnimations:@"testAnimation" context:NULL];
[UIView setAnimationDuration:10.f];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
[UIView setAnimationDelegate:self];
[UIView setAnimationRepeatAutoreverses:NO];
[UIView setAnimationRepeatCount:999999];
frame = _scrollLabel.frame;
frame.origin.x = -frame.size.width;
NSLog(@"frame orgin:%f",frame.origin.x);
_scrollLabel.frame = frame;
[UIView commitAnimations];
然后在网上查了各种资料，都没有解决。。。最终发现，我的这个视图控制器是present模态化视图，在iOS7下模态化出来的视图UIView就出现问题了。。。果断把present换成了push。。。但是push又达不到prensent的效果，于是又模仿present，在push视图中实现present动画。代码如下：
一、push
MCLotteryListViewController *list = [[MCLotteryListViewController alloc]init];
//list.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
// [self presentViewController:list animated:YES completion:^{
//
// }];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:0.75];
[self.navigationController pushViewController:list animated:NO];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.navigationController.view cache:NO];
[UIView commitAnimations];
二、pop
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:0.75];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:self.navigationController.view cache:NO];
[UIView commitAnimations];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDelay:0.375];
[self.navigationController popViewControllerAnimated:NO];
[UIView commitAnimations];
转载请注明，错误请指正！