Question

我有两种动画方法，基本上只是重复...如何防止它们重叠和闪烁，有没有一种方便的方法呢？

谢谢，

-(void) doPowerChangeAnimUp
{
    powerIconChange .alpha    = 0;
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDidStopSelector:@selector(animationDidStop:)];
    [UIView setAnimationDelegate:self] ;
    [UIView setAnimationDuration:2];
    [powerIconChange  setAlpha:1];
    [UIView commitAnimations];
}

-(void)animationDidStop:(NSString *)animationID 
{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDelegate:self] ;
    [UIView setAnimationDidStopSelector:@selector(doPowerChangeAnimUp)];
    [UIView setAnimationDuration:2];
    [powerIconChange  setAlpha:0];
    [UIView commitAnimations];
}

Answer 1

您可以尝试将动画设置为自动反转，而不是创建新动画，这可能会产生更平滑的“反弹”：

-(void) doPowerChangeAnimUp
{
    powerIconChange .alpha    = 0;
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationRepeatAutoreverses:YES];
    [UIView setAnimationRepeatCount:2];
    [UIView setAnimationDidStopSelector:@selector(animationDidStop:)];
    [UIView setAnimationDelegate:self] ;
    [UIView setAnimationDuration:2];
    [powerIconChange  setAlpha:1];
    [UIView commitAnimations];
}

更多的是，您可以将animationRepeatCount增加到更高的值，而不是调用停止选择器，这样它就可以用一个beginAnimations块覆盖所有动画。

如何在iPhone上控制重叠Alpha淡入淡出

1 个答案: