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可能的重复：
在无缝循环中动画无限滚动图像

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，图像停止动画并且完全消失

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：在无缝循环中动画无限滚动图像的 可能副本

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1 回答 1

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查看UIApplicationDelegate协议参考。在调用方法的讨论部分中，applicationDidEnterBackground:您可以找到有关您问题的答案。

您可以在重新打开应用程序时尝试重新启动动画

于 2012-11-05T15:28:17.303 回答