swift程序进入后台

class ViewController: UIViewController {
    
    @IBOutlet weak var message: UILabel!
    @IBOutlet weak var myNotification: UILabel!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        NSNotificationCenter.defaultCenter().addObserver(self,selector: #selector(ViewController.updateInterface(_:)),name: UIApplicationWillEnterForegroundNotification,object: nil)
    }
    
    func updateInterface (notification: NSNotification){
        myNotification.text = "Back to background with notification"
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    
}

（编辑：李大同）

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