ViewController

override func viewDidLoad() {
        super.viewDidLoad()
        
        //通知
        NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(didNotif(_:)), name: "notifName", object: nil)
    }
    
    func didNotif(sender: NSNotification) {
        print(sender.name)  //通知名称
        print(sender.userInfo) //附加的信息
        print(sender.object) //发送者
        
        label.text = sender.userInfo!["info"] as! String
    }

OtherViewController

NSNotificationCenter.defaultCenter().postNotificationName("notifName", object: nil, userInfo: ["info":"xxx"])