如何在按下主页按钮后在后台为CABasicAnimation设置动画？ [英] How to animate the CABasicAnimation in background after the home button is pressed?

问题描述

我是ios开发的新手。我正在我的项目中使用轮子图像。动画在前景模式下工作正常。之后，我按下主页按钮。现在我重新启动应用程序轮子动画不起作用。这是我的代码：

I'm new in ios development. I'm using wheel images in my project.The animation is working fine in foreground mode. After that I pressed the home button.now i relaunch the app the wheel animation is not working. this is my code:

CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; animation.fromValue = [NSNumber numberWithFloat:0.0f];
animation.toValue = [NSNumber numberWithFloat: 2*M_PI];
animation.duration = 1.0f;
animation.repeatCount = INFINITY;
[imageLeft.layer addAnimation:animation forKey:@"SpinAnimation"];

推荐答案

试试这个，

- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(addAnimation:) name:UIApplicationWillEnterForegroundNotification object:nil];

}

- (void)addAnimation:(NSNotification *)notificaiton
 {
 CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
 animation.fromValue = [NSNumber numberWithFloat: 2*M_PI];
 animation.toValue = [NSNumber numberWithFloat:0.0f];
 animation.duration = 4.0f;
 animation.repeatCount = INFINITY;
 [imageLeft.layer addAnimation:animation forKey:@"SpinAnimation"];
 [imageRight.layer addAnimation:animation forKey:@"SpinAnimation"];
 }

这篇关于如何在按下主页按钮后在后台为CABasicAnimation设置动画？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！