我想在iPad上刷一个UIImageview，我该怎么做？ [英] I want to flash an UIImageview on the iPad, how do I do that?

问题描述

我想让 UIImageView 闪过几次。

目前我不知道该怎么做。

Currently I don't know how to do that.

-(void)arrowsAnimate{
    [UIView animateWithDuration:1.0 animations:^{
        arrow1.alpha = 1.0;
        arrow2.alpha = 1.0;
        arrow3.alpha = 1.0;
        NSLog(@"alpha 1");
    } completion:^(BOOL finished){        

        [self arrowsAnimate2];

    }];
}

-(void)arrowsAnimate2{
    [UIView animateWithDuration:1.0 animations:^{
         arrow1.alpha = 0.0;
         arrow2.alpha = 0.0;
         arrow3.alpha = 0.0;
         NSLog(@"alpha 0");
    } completion:^(BOOL finished){;}];
}

稍后我称之为：

for (int i = 0;i < 10; i++){
[self arrowsAnimate]; }

这给了我10x alpha 1，然后是10x alpha 0.中间我们只看到一个动画。
有什么建议吗？

This gives me 10x alpha 1, and then 10x alpha 0. In the middle we see only one animation. Any suggestions?

谢谢。

推荐答案

那里是一种使用1个动画块实现闪动动画的简单方法：

There is a simpler way to achieve a flashing animation using only 1 animation block:

aview.alpha = 1.0f;
[UIView animateWithDuration:0.5f
                      delay:0.0f 
                    options:UIViewAnimationOptionAutoreverse
                 animations:^ {
       [UIView setAnimationRepeatCount:10.0f/2.0f];
       aview.alpha = 0.0f;
} completion:^(BOOL finished) { 
       [aview removeFromSuperview]; 
}];    

诀窍是使用 [UIView setAnimationRepeatCount：NTIMES / 2]; * _inside_ *您的动画块。
无需额外功能或额外循环。

The trick is to use [UIView setAnimationRepeatCount:NTIMES/2]; *_inside_* your animation block. No need for extra functions or extra loops.

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