模拟按Home键退出应用的简单方法(分享)

实例如下： func exitApplication() { let app = UIApplication.sharedApplication().delegate as! AppDelegate let window = app.window dispatch_async(dispatch_get_main_queue(), { UIView.animateWithDuration(0.5, animations: { window!.alpha = 0 window?.frame = CGRectMake((windo