1.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.

附录:

UIViewController中的view显示步骤

--------------------------------------------------------------------------------------------------------

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:

从后台进入程序时的情况:

viewWillLayoutSubviews
viewDidLayoutSubviews

--------------------------------------------------------------------------------------------------------

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
}

2.基本动画类型

旋转动画

    /* 旋转 */
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; // 一次完整的动画所持续的时间
animation.duration = .f; // 重复次数
animation.repeatCount = HUGE_VALF; // 起始角度
animation.fromValue = [NSNumber numberWithFloat:0.0]; // 终止角度
animation.toValue = [NSNumber numberWithFloat:- * M_PI]; // 添加动画
[_showView.layer addAnimation:animation
forKey:@"rotate-layer"];

透明度

    // 透明度动画
CABasicAnimation* fadeAnim = [CABasicAnimation animationWithKeyPath:@"opacity"]; // 初始值
fadeAnim.fromValue = [NSNumber numberWithFloat:1.0]; // 结束值
fadeAnim.toValue = [NSNumber numberWithFloat:0.0]; // 动画持续一次的时间
fadeAnim.duration = 1.0; // 开始动画
[_showView.layer addAnimation:fadeAnim forKey:@"opacity"]; // 无论动画是否被中断,其最终的值还是被设置过了
_showView.layer.opacity = 0.0;

borderWidth动画

    // borderWidth动画
CABasicAnimation *borderWidthAnimation = \
[CABasicAnimation animationWithKeyPath:@"borderWidth"]; // 初始值
borderWidthAnimation.fromValue = [NSNumber numberWithFloat:0.0]; // 结束值
borderWidthAnimation.toValue = [NSNumber numberWithFloat:3.0]; // 动画持续一次的时间
borderWidthAnimation.duration = .f; // 开始动画
[_showView.layer addAnimation:borderWidthAnimation forKey:@"borderWidth"]; // 无论动画是否被中断,其最终的值还是被设置过了
_showView.layer.borderWidth = 3.0f;

backgroundColor动画

    // backgroundColor动画
CABasicAnimation *borderWidthAnimation = \
[CABasicAnimation animationWithKeyPath:@"backgroundColor"]; // 初始值
borderWidthAnimation.fromValue = (id)[[UIColor redColor] CGColor]; // 结束值
borderWidthAnimation.toValue = (id)[[UIColor greenColor] CGColor]; // 动画持续一次的时间
borderWidthAnimation.duration = .f; // 开始动画
[_showView.layer addAnimation:borderWidthAnimation forKey:@"borderWidth"]; // 无论动画是否被中断,其最终的值还是被设置过了
_showView.layer.backgroundColor = [[UIColor greenColor] CGColor];

borderColor动画

    // borderColor动画
CABasicAnimation *borderWidthAnimation = \
[CABasicAnimation animationWithKeyPath:@"borderColor"]; // 初始值
borderWidthAnimation.fromValue = (id)[[UIColor redColor] CGColor]; // 结束值
borderWidthAnimation.toValue = (id)[[UIColor greenColor] CGColor]; // 动画持续一次的时间
borderWidthAnimation.duration = .f; // 开始动画
[_showView.layer addAnimation:borderWidthAnimation forKey:@"borderWidth"]; // 无论动画是否被中断,其最终的值还是被设置过了
_showView.layer.backgroundColor = [[UIColor greenColor] CGColor];

bounds.size.height动画

    // bounds.size.height动画
CABasicAnimation *borderWidthAnimation = \
[CABasicAnimation animationWithKeyPath:@"bounds.size.height"]; // 初始值
borderWidthAnimation.fromValue = [NSNumber numberWithFloat:100.0f]; // 结束值
borderWidthAnimation.toValue = [NSNumber numberWithFloat:.f]; // 动画持续一次的时间
borderWidthAnimation.duration = 0.5f; // 选择一种动画的时间轴方式
borderWidthAnimation.timingFunction = \
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut]; // ??
borderWidthAnimation.fillMode = kCAFillModeForwards; // 开始动画
[_showView.layer addAnimation:borderWidthAnimation forKey:@"bounds.size.height"]; // 无论动画是否被中断,其最终的值还是被设置过了
_showView.layer.bounds = CGRectMake(self.view.center.x, self.view.center.y, , .f);

contents动画

    // 初始化一张图片
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(, , , )];
imageView.image = [UIImage imageNamed:@""]; // 添加进view中
[self.view addSubview:imageView]; // contents动画
CABasicAnimation *crossFade = [CABasicAnimation animationWithKeyPath:@"contents"]; crossFade.duration = 2.0;
crossFade.fromValue = (id)([UIImage imageNamed:@""].CGImage);
crossFade.toValue = (id)([UIImage imageNamed:@""].CGImage); [imageView.layer addAnimation:crossFade forKey:@"animateContents"]; // 进行最后的设置
imageView.image = [UIImage imageNamed:@""];

圆角动画

    // 初始化一张图片
UIView *showView = [[UIView alloc] initWithFrame:CGRectMake(, , , )];
showView.backgroundColor = [UIColor redColor];
[self.view addSubview:showView]; // 圆角动画
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"cornerRadius"]; animation.fromValue = [NSNumber numberWithFloat:.f];
animation.toValue = [NSNumber numberWithFloat:.f];
animation.duration = 1.0;
[showView.layer setCornerRadius:.f]; // 最后设置
[showView.layer addAnimation:animation forKey:@"cornerRadius"];

支持的动画太多了,以下是苹果的官方文档中提出的支持的动画:

Property

Default animation

anchorPoint

Uses the default implied CABasicAnimation object, described in Table B-2.

backgroundColor

Uses the default implied CABasicAnimation object, described in Table B-2.

backgroundFilters

Uses the default implied CATransition object, described in Table B-3. Sub-properties of the filters are animated using the default implied CABasicAnimation object, described in Table B-2.

borderColor

Uses the default implied CABasicAnimation object, described in Table B-2.

borderWidth

Uses the default implied CABasicAnimation object, described in Table B-2.

bounds

Uses the default implied CABasicAnimation object, described in Table B-2.

compositingFilter

Uses the default implied CATransition object, described in Table B-3. Sub-properties of the filters are animated using the default implied CABasicAnimation object, described in Table B-2.

contents

Uses the default implied CABasicAnimation object, described in Table B-2.

contentsRect

Uses the default implied CABasicAnimation object, described in Table B-2.

cornerRadius

Uses the default implied CABasicAnimation object, described in Table B-2.

doubleSided

There is no default implied animation.

filters

Uses the default implied CABasicAnimation object, described in Table B-2. Sub-properties of the filters are animated using the default implied CABasicAnimation object, described in Table B-2.

frame

This property is not animatable. You can achieve the same results by animating the bounds and position properties.

hidden

Uses the default implied CABasicAnimation object, described in Table B-2.

mask

Uses the default implied CABasicAnimation object, described in Table B-2.

masksToBounds

Uses the default implied CABasicAnimation object, described in Table B-2.

opacity

Uses the default implied CABasicAnimation object, described in Table B-2.

position

Uses the default implied CABasicAnimation object, described in Table B-2.

shadowColor

Uses the default implied CABasicAnimation object, described in Table B-2.

shadowOffset

Uses the default implied CABasicAnimation object, described in Table B-2.

shadowOpacity

Uses the default implied CABasicAnimation object, described in Table B-2.

shadowPath

Uses the default implied CABasicAnimation object, described in Table B-2.

shadowRadius

Uses the default implied CABasicAnimation object, described in Table B-2.

sublayers

Uses the default implied CABasicAnimation object, described in Table B-2.

sublayerTransform

Uses the default implied CABasicAnimation object, described in Table B-2.

transform

Uses the default implied CABasicAnimation object, described in Table B-2.

zPosition

Uses the default implied CABasicAnimation object, described in Table B-2.

http://www.cnblogs.com/pengyingh/articles/2379631.html

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