IOS 6 UIView动画完成

Question

知道为什么下面的代码在IOS 6下不起作用,虽然它在IOS 5下运行完美但在IOS 6上运行但在IOS 6上(在模拟器和iPad中)NSLog根本没有执行!

[UIView animateWithDuration: 2.0f animations:^{ [self.view setAlpha:0.7f];}
                 completion:^(BOOL finished){ if(finished)  NSLog(@"Finished !!!!!!");}];

Answer 1

这里是守则

  [UIView animateWithDuration:2.0
                      delay:0.0
                    options: UIViewAnimationOptionCurveEaseInOut
                 animations:^{
                    [self.view setAlpha:0.7f];

                 }
                 completion:^(BOOL finished){
                     if(finished)  NSLog(@"Finished !!!!!");
                     // do any stuff here if you want
                 }];