我想在iPad上刷一个UIImageview,我该怎么做？

Question

我想UIImageView多次闪光.

目前我不知道该怎么做.

实际代码:

-(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){;}];
}

后来我称之为:

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

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

谢谢.

Answer 1

有一种更简单的方法可以仅使用1个动画块来实现闪烁动画:

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_* your animation block.无需额外功能或额外循环.