ios4 - iOS 4.2 : Flip image using block animations

Question

我的应用程序中有这段代码:

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

但是在 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:
我无法让它正常工作。谁能帮我？
谢谢!

Answer 1

[UIView transitionWithView:imgView    // use the forView: argument
                  duration:1          // use the setAnimationDuration: argument
                   options:UIViewAnimationOptionTransitionFlipFromLeft 
                          // check UIViewAnimationOptions for what options you can use
                animations:^{         // put the animation block here
                              imgView.image = img2;
                           }
                completion:NULL];     // nothing to do after animation ends.