UIViewAnimation翻轉不工作

Question

在UIView子類我有這樣的：

self.frontImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"front"]]; 
self.backImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"back"]]; 
[self addSubview:self.backImageView]; 


[UIView animateWithDuration:0.5 
          delay:0.0 
         options:UIViewAnimationOptionTransitionFlipFromLeft 
        animations:^{ 
         [self.backImageView removeFromSuperview]; 
         [self addSubview:self.frontImageView];} 

        completion:^(BOOL finished){ 
         //nothing 
        }]; 

但我不明白的翻轉動畫。正面圖像視圖立即出現。我究竟做錯了什麼？

Answer 1

您正在使用的

transitionFromView:toView:duration:options:completion: 

animateWithDuration:delay:options:animations:completion: 

而不是一個愚蠢的錯誤代碼應爲：

[UIView transitionFromView:backImageView 
        toView:frontImageView 
        duration:0.5 
        options:UIViewAnimationOptionTransitionFlipFromLeft 
       completion:^(BOOL finished) { 
        // animation completed 
       }];