使用Quartz 2D仿射變換的順序

Question

我試圖用iOS中的UIAlertView在OS X中模擬不正確的密碼輸入動畫。本質上，我希望它能夠翻譯左側的警報然後右側翻譯。這是我在做什麼：

[UIView animateWithDuration:0.5 
       animations:^{ 
        alertView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, 200, 0); 
        alertView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, -200, 0); 
       }]; 

但是，這並沒有預期的效果。該警報立即向右拍攝，然後順利地轉換到左側。我怎樣才能讓這兩種翻譯在彼此之後順利進行？

Answer 1

試試這個：

[UIView animateWithDuration:0.5 animations:^{ 

     alertView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, 200, 0); 

    } completion:^(BOOL finished) { 

     [UIView animateWithDuration:0.5 animations:^{ 
      alertView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, -200, 0); 
     }]; 
    }]; 

但我會做動畫是這樣的：

[UIView animateWithDuration:0.1 animations:^{ 

     alertView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, 20, 0); 

    } completion:^(BOOL finished) { 

     [UIView animateWithDuration:0.1 animations:^{ 

      alertView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, -20, 0); 

     } completion:^(BOOL finished) { 

      [UIView animateWithDuration:0.1 animations:^{ 
       alertView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, 0, 0); 
      }]; 

     }]; 
    }]; 

你了！ ;-)