UIView transistionWithAnimation不起作用

所以我想學習塊的過渡動畫。所以我去了蘋果文檔，並使用old method (without blocks)舉了一個動畫的例子。我已經採取了代碼片段（稍作修改）並對其進行了測試。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; 
}

現在下面的代碼是我嘗試將代碼轉換在上面的代碼塊

[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; 
     } 
}];

從我所瞭解的是，下面的代碼應該工作。我在支持塊的iOS 4.2上測試這個。然而，它似乎沒有動畫，我不明白這是爲什麼。它改變了觀點，只是不動畫。請幫忙。

來源

2011-12-26 fzaziz

嘗試用transitionToView替換transitionWithView：fromView

來源

2012-01-03 19:32:14 Rich86man

UIView transistionWithAnimation不起作用

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