Question

我有两个UIImageView - leftSide和rightSide，我希望淡入其中，然后逐个淡出，循环播放。

我如何在Xcode中执行此操作？我试过了CABasicAnimation，但这不起作用（我不确定为什么，根本没有错误，图片也不会褪色）。

谢谢！

编辑：这是我正在使用的代码：

-(void)leftSideFade{
    CABasicAnimation *blink;
    blink = [CABasicAnimation animationWithKeyPath:@"opacity"];
    blink.duration = 1.0;
    blink.repeatCount = 5;
    blink.autoreverses = YES;
    blink.fromValue = [NSNumber numberWithFloat:1.0];
    blink.toValue = [NSNumber numberWithFloat:0.0];
    [leftSideStart.layer addAnimation:blink forKey:@"animateOpacity"];
    [self rightSideFade];
}

-(void)rightSideFade{
    CABasicAnimation *blink;
    blink = [CABasicAnimation animationWithKeyPath:@"opacity"];
    blink.duration = 1.0;
    blink.repeatCount = 5;
    blink.autoreverses = YES;
    blink.fromValue = [NSNumber numberWithFloat:1.0];
    blink.toValue = [NSNumber numberWithFloat:0.0];
    [rightSideStart.layer addAnimation:blink forKey:@"animateOpacity"];
    [self leftSideFade];
}

Answer 1

- (void)fadeIn 
{
  [UIView beginAnimations:@"fadeIn Animation" context:nil];
  [UIView setAnimationDuration:1.0];
  imageView.alpha = 1.0;
  [UIView commitAnimations];
}

试试这个。

Answer 2

使用UIView animateWithDuration更简单的方法：动画：完成：？在那里你只需改变你的观点的alpha，它们就会淡入/淡出以下是示例代码：

[UIView animateWithDuration:duration
                 animations:^
{
    //Here you set values you want to see in the end of animation
    leftView.alpha = 0.0f;
    rightView.alpha = 1.0f;
}
                 completion:^(BOOL finished)
{
    //something to do after animation finished
}

Answer 3

尝试使用以下内容：

- (void) fadeinRightFadwOutLeft {
    [UIView beginAnimations:@"start" context:nil];
    [UIView setAnimationDuration:1.0];
    rightSide.alpha = 0.0;
    leftSide.alpha = 1.0;
    [UIView commitAnimations];

}

- (void) fadeinLeftFadwOutRight {
    [UIView beginAnimations:@"start" context:nil];
    [UIView setAnimationDuration:1.0];
    leftSide.alpha = 0.0;
    rightSide.alpha = 1.0;
    [UIView commitAnimations];

}

UIImageViews的淡入淡出动画？

3 个答案: