UIView transistionWithAnimation不起作用

所以我想学习块的过渡动画。所以我去了苹果文档，并使用old method (without blocks)举了一个动画的例子。我已经采取了代码片段（稍作修改）并对其进行了测试。它完美UIView transistionWithAnimation不起作用

[UIView setAnimationDelegate:nil]; 
[UIView beginAnimations:nil context:nil]; 
[UIView setAnimationDuration:kTransitionDuration]; 
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight 
           forView:self.view 
           cache:YES]; 

if ([self.instructionsView superview]) { 
    [self.instructionsView removeFromSuperview]; 
    [self.view addSubview:contentView]; 
} else { 
    [self.contentView removeFromSuperview]; 
    [self.view addSubview:instructionsView]; 
} 

[UIView commitAnimations]; 

// adjust our done/info buttons accordingly 
if ([instructionsView superview]) { 
    self.navigationItem.rightBarButtonItem = doneButton; 
} else { 
    self.navigationItem.rightBarButtonItem = flipButton; 
}

现在下面的代码是我尝试将代码转换在上面的代码块

[UIView transitionWithView:self.view duration:kTransitionDuration options:UIViewAnimationTransitionFlipFromRight animations:^{ 
     if ([self.instructionsView superview]) { 
      [self.instructionsView removeFromSuperview]; 
      [self.view addSubview:contentView]; 
     } else { 
      [self.contentView removeFromSuperview]; 
      [self.view addSubview:instructionsView]; 
     } 
} completion:^(BOOL finished){ 

     if ([instructionsView superview]) { 
      self.navigationItem.rightBarButtonItem = doneButton; 
     } else { 
      self.navigationItem.rightBarButtonItem = flipButton; 
     } 
}];

从我所了解的是，下面的代码应该工作。我在支持块的iOS 4.2上测试这个。然而，它似乎没有动画，我不明白这是为什么。它改变了观点，只是不动画。请帮忙。

来源

2011-12-26 fzaziz

尝试用transitionToView替换transitionWithView：fromView

来源

2012-01-03 19:32:14 Rich86man

UIView transistionWithAnimation不起作用

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