嘗試堆疊到UIView註釋

Question

我試圖堆疊兩個動畫。我在兩張圖片的代碼中使用相同的UIImage。 我首先確定（第一行）要加載的圖像。

NSString *imageName = (self._handleToSectionModel.calculatorState == CALCULATOR_OPENED)? 
[NSString stringWithString:@"1_dg_please_see_warning_2lines.png"] : 
[NSString stringWithString:@"1_dg_warnings_landing_page.png"]; 

我想淡出當前圖像，並加載新的圖像和消除它。顯然，當我 執行這一點，只有真正動畫第二個。將動畫 堆疊到相同視圖的正確方法是什麼，以便它們都完全運行？

UIImage *image = [UIImage imageNamed:imageName]; 
[UIView beginAnimations:nil context:NULL]; 
[UIView setAnimationDuration:1.0f]; 

self.warningImage.alpha = 0.0f; 

[UIView commitAnimations]; 

[UIView beginAnimations:nil context:NULL]; 
[UIView setAnimationDuration:1.0f]; 

self.warningImage.alpha = 1.0f; 
self.warningImage.image = image; 

[UIView commitAnimations]; 

編輯/ UPDATE： 解決：

[UIView animateWithDuration:1.0 animations:^{ self.warningImage.alpha = 0.0f; } completion:^(BOOL finished){ 
     [UIView animateWithDuration:1.0 animations:^{ self.warningImage.alpha = 1.0f; self.warningImage.image = image; } completion:^(BOOL finished){}]; 
    }]; 

由於鏈接在我的評論！

Answer 1

[UIView animateWithDuration:1.0 animations:^{ self.warningImage.alpha = 0.0f; } completion:^(BOOL finished){ 
    [UIView animateWithDuration:1.0 animations:^{ self.warningImage.alpha = 1.0f; self.warningImage.image = image; } completion:^(BOOL finished){}]; 
}];