使uibutton脉动。

Question

我试图通过在视图加载后来回更改alpha级别来制作一个有图像的uibutton缓慢脉动...

目前我正在这样做，但它什么也没做......

-(void)loopdyloop
{
    while ( myCount < 1000 )
    {

        [UIView animateWithDuration:3.0
                              delay:0.0f
                            options:UIViewAnimationCurveEaseOut
                         animations:^{


                             iconButton.alpha = 0.0;


                         } completion:^(BOOL finished) {
                             if (finished) {

                                 NSLog(@"animated");
                             }
                         }];


        [UIView animateWithDuration:3.0
                              delay:0.0f
                            options:UIViewAnimationCurveEaseOut
                         animations:^{


                             iconButton.alpha = 1.0;


                         } completion:^(BOOL finished) {
                             if (finished) {

                                 NSLog(@"animated");
                             }
                         }];




        myCount++;
    }

}

从viewdidload方法

调用此方法

非常原始我知道，但这是我最好的尝试，如果你对如何实现这一点有任何想法，我将不胜感激。

Answer 1

如何在viewDidLoad中的按钮图层中应用它：

CABasicAnimation *pulseAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
pulseAnimation.duration = .5;
pulseAnimation.toValue = [NSNumber numberWithFloat:1.1];
pulseAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
pulseAnimation.autoreverses = YES;
pulseAnimation.repeatCount = FLT_MAX;
[YOURButton.layer addAnimation:pulseAnimation forKey:nil];

你可以尝试一下。

Answer 2

如果你想让它永远重复，你可以将动画选项添加到自动反转和重复，如下所示：

[UIView animateWithDuration:3.0
                      delay:0.0f
                    options:UIViewAnimationCurveEaseOut | 
                            UIViewAnimationOptionRepeat | 
                            UIViewAnimationOptionAutoreverse
                 animations:^{
                     iconButton.alpha = 0.0;
                 } 
                 completion:^(BOOL finished) {
                     // You could do something here
                 }];

它会使alpha首先动画为0.0，然后回到原始（1.0）然后反复做这两件事......