iOS CAlayer 动画进入后台或者 调用viewWillDisappear viewDidDisappear后动画暂停问题的解决办法

iOS CAlayer 动画进入后台或者 调用viewWillDisappear
viewDidDisappear后动画暂停问题的解决办法

.When my application is entering background, because the user push the home button, the animations correctly set in pause, but when i re-open my app, the animations have disappeard.How could i fix it please ?

当我的应用进入了后台,因为用户按了home键,动画被设置成了暂停,但当我重新打开应用时,动画都消失了,我如何修复它?

This is correct and built-in behavior. When you leave the app, all animations are removed from their layers: the system calls removeAllAnimations on every layer.

你的情况是系统默认的行为.当你离开了应用后(比如进入了后台),所有的动画都从他们的layer上移除了:因为系统调用了removeAllAnimations,针对所有的layer.

CABasicAnimation添加动画离开屏幕就动画停止的问题

设置animation动画终了，不返回初始状态

animation.removedOnCompletion = NO;
animation.fillMode = kCAFillModeForwards;

- (void)layoutSublayers{

    [superlayoutSublayers];

    [selfsetupColorAnimation];

     NSLog(@"layoutSublayers");

}

http://www.cnblogs.com/YouXianMing/p/3670846.html

附录:

UIViewController中的view显示步骤

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进入UIViewController时的情况:

viewDidLoad
viewWillLayoutSubviews
viewDidLayoutSubviews
viewWillAppear
viewWillLayoutSubviews
viewDidLayoutSubviews
viewDidAppear

切换了Controller后的情况(比如你在TabbarController中切换了):

viewWillDisappear
viewDidDisappear

再次切换回来后的情况:
viewWillLayoutSubviews
viewDidLayoutSubviews
viewWillAppear
viewWillLayoutSubviews
viewDidLayoutSubviews
viewDidAppear

退入到后台后的情况:

无

从后台进入程序时的情况:

viewWillLayoutSubviews
viewDidLayoutSubviews

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为了解决从后台切换回来或者从TabbarController切换回来动画还能继续动画效果,需要如下的解决方案:

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
 
    // 添加通知(处理从后台进来后的情况)
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(addAnimation:)
                                                 name:UIApplicationWillEnterForegroundNotification
                                               object:nil];
    
    // 添加动画的代码
}

- (void)addAnimation:(NSNotification *)notificaiton
{
　 　// 添加动画的代码
}