从背景返回时，在无缝循环中动画无限滚动图像不起作用[重复]

Question

可能重复：
Animate infinite scrolling of an image in a seamless loop

我有以下代码运行同一图像的无限循环

问题是当用户最小化应用程序并返回它时，图像停止动画并完全消失

这是我的代码：

-(void)cloudScroll
{
UIImage *cloudsImage = [UIImage imageNamed:@"TitleClouds.png"];
UIColor *cloudPattern = [UIColor colorWithPatternImage:cloudsImage];
CALayer *cloud = [CALayer layer];
cloud.backgroundColor = cloudPattern.CGColor;
cloud.transform = CATransform3DMakeScale(1, -1, 1);
cloud.anchorPoint = CGPointMake(0, 1);
CGSize viewSize = self.cloudsImageView.bounds.size;
cloud.frame = CGRectMake(0, 0, cloudsImage.size.width + viewSize.width, viewSize.height);
[self.cloudsImageView.layer addSublayer:cloud];

CGPoint startPoint = CGPointZero;
CGPoint endPoint = CGPointMake(-cloudsImage.size.width, 0);
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"position"];
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
animation.fromValue = [NSValue valueWithCGPoint:startPoint];
animation.toValue = [NSValue valueWithCGPoint:endPoint];
animation.repeatCount = HUGE_VALF;
animation.duration = 3.0;
[cloud addAnimation:animation forKey:@"position"];
}

编辑： Animate infinite scrolling of an image in a seamless loop的可能重复

Answer 1

查看UIApplicationDelegate 协议参考。在名为applicationDidEnterBackground: 的方法的讨论部分中，您可以找到问题的答案。

您可以尝试在重新打开应用程序时重新触发动画