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((window?.bounds.size.width)!/2.0, (window?.bounds.size.height)!/2.0, 0, 0) 
      }) { (finish) in
 exit(0) 
      } 
    }) 
  } 

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