addSubview动画作品只有第二次

Question

后，我试图让我的标签显示动画：

- (void)handleSingleTap:(UIGestureRecognizer *)gestureRecognizer { 
    if (isShowingRectangleLabel == NO) { 
    [UIView transitionWithView:rectangleLabel duration:0.5 
         options:UIViewAnimationOptionTransitionCrossDissolve 
        animations:^ { [self.view addSubview:rectangleLabel]; } 
        completion:nil]; 
     NSLog(@"action"); 
     isShowingRectangleLabel = YES; 
    } else { 
     [UIView transitionWithView:rectangleLabel duration:0.5 
         options:UIViewAnimationOptionTransitionFlipFromBottom 
        animations:^ { [rectangleLabel removeFromSuperview]; } 
        completion:nil]; 
     isShowingRectangleLabel = NO; 
    } 

} 

但这仅动画后第二次增加了子视图的工作。我该如何解决它？

编辑澄清，addSubview工程，但没有动画。

Answer 1

这样做：

- (void)handleSingleTap:(UIGestureRecognizer *)gestureRecognizer { 
    if (isShowingRectangleLabel == NO) { 
    [UIView transitionWithView:self.view duration:0.5 
         options:UIViewAnimationOptionTransitionCrossDissolve 
        animations:^ { [self.view addSubview:rectangleLabel]; } 
        completion:nil]; 
     NSLog(@"action"); 
     isShowingRectangleLabel = YES; 
    } else { 
     [UIView transitionWithView:self.view duration:0.5 
         options:UIViewAnimationOptionTransitionFlipFromBottom 
        animations:^ { [rectangleLabel removeFromSuperview]; } 
        completion:nil]; 
     isShowingRectangleLabel = NO; 
    } 

}