swift Notification通知

==========================
//class TasksCell
 func push(){
        

          let sizeString = "123132312"
         NotificationCenter.default.post(name: NSNotification.Name(rawValue: "checkDetail"), object: self, userInfo: ["key": sizeString])
    }
 

==========================
//class TasksViewController

 override func viewDidLoad() {
        super.viewDidLoad()
        setupTableVie()
        setRefresh()
        setupNavBar()
        
        
    

        
        NotificationCenter.default.addObserver(self, selector: #selector(checkDetail(notification:)), name: NSNotification.Name(rawValue: "checkDetail"), object: nil)
    }
    /// 点击了加号按钮
  @objc  func checkDetail(notification: Notification) {
    
    let titles  = notification.userInfo!["key"] as! NSString
   
     print(titles)
    }

  deinit {
        NotificationCenter.default.removeObserver(self)
    }