Ios4 iOS 4.2：使用块动画翻转图像

我在我的应用程序中有一段代码：

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:imgView cache:YES];
    imgView.image = img2;
[UIView commitAnimations];

但在iOS 4.0及更高版本中不鼓励使用这种方法，我应该使用

transitionWithView:duration:options:animations:completion:

我不能让它正常工作。有人能帮我吗？

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谢谢

我根据您的代码创建了此函数：

- (void)flipCurrentView:(UIView*)oldView withNewView:(UIView*)newView reverse:(BOOL)reverse
{
    newView.alpha = 0;
    [UIView transitionWithView:newView
                      duration:1      
                       options:UIViewAnimationOptionTransitionFlipFromLeft 
                    animations:^{        
                        oldView.alpha = 0;
                        newView.alpha = 1;
                    }
                    completion:^(BOOL finished){
                        if(reverse){
                            [self flipCurrentView:newView withNewView:oldView reverse:NO];
                        }
                        finished = YES;
                    }];   
}

---

谢谢！就像一个符咒。@KennyTM:你能用它来澄清吗？

- (void)flipCurrentView:(UIView*)oldView withNewView:(UIView*)newView reverse:(BOOL)reverse
{
    newView.alpha = 0;
    [UIView transitionWithView:newView
                      duration:1      
                       options:UIViewAnimationOptionTransitionFlipFromLeft 
                    animations:^{        
                        oldView.alpha = 0;
                        newView.alpha = 1;
                    }
                    completion:^(BOOL finished){
                        if(reverse){
                            [self flipCurrentView:newView withNewView:oldView reverse:NO];
                        }
                        finished = YES;
                    }];   
}