我可以在 UIView 动画块中使用 setAnimationRepeatCount: 吗？

Posted 2023-03-12

【中文标题】我可以在 UIView 动画块中使用 setAnimationRepeatCount: 吗？

【英文标题】：Can I use setAnimationRepeatCount: within a UIView animation block?

【发布时间】：2011-12-21 20:25:32

【问题描述】：

我想使用 UIAnimation 的块样式方法使按钮闪烁，特别是：

animateWithDuration:delay:options:animations:completion

我认为我需要设置的一件事是“AnimationRepeatCount”属性 - 可以像这样在动画块代码中设置吗？

- (void)animateItemWithBlinking:(BOOL)blinking 

    __block BOOL isInBlinkState = blinking;

    if (!isBlinking)
           
        // Start blinking                
        [UIView animateWithDuration:0.50f 
            delay:0 
            options:UIViewAnimationCurveLinear
            animations:^
                // Can I call the AnimationRepeat setter here or 
                // should it be elsewhere outside this block?
                [UIView setAnimationRepeatCount:1000];
                [UIView setAnimationRepeatAutoreverses:YES];

                [button setAlpha:0.0f];        
             completion:^(BOOL finished) 
                // eventually, this is a value that I want the method to return
                isInBlinkState = !isInBlinkState;        
        ];         
    
    else
    
        // Stop blinking
        [UIView animateWithDuration:0.30f 
            delay:0 
            options:UIViewAnimationOptionAllowUserInteraction
            animations:^
                // Stop blinking - reset everything
                [UIView setAnimationBeginsFromCurrentState:YES];
                [UIView setAnimationRepeatCount:1];

                [button setAlpha:1.0f];        
         completion:^(BOOL finished) 
            // eventually, this is a value that I want the method to return
            isInBlinkState = !isInBlinkState;        
        ];
    

在基于块的调用之前，我原来的方法是这样的：

- (void)animateItemWithBlinking:(BOOL) blinking 
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.50f];
    [UIView setAnimationCurve:UIViewAnimationCurveLinear];

    if( !blinking )        
        // Start it
        [UIView setAnimationRepeatCount:1000];
        [UIView setAnimationRepeatAutoreverses:YES];

        [button setAlpha:0.0f];                
     else 
        // Stop it
        [UIView setAnimationBeginsFromCurrentState:YES];
        [UIView setAnimationRepeatCount:1];

        [button setAlpha:1.0f];        
    
    blinking = !blinking;
    [UIView commitAnimations];

【问题讨论】：

你可以看看这个和你类似的问题。 ***.com/questions/4069758/…

【参考方案1】：

是的，您可以将它设置在块内，它会按照您的预期进行。