swift中通知的使用

來源:互聯網
上載者:User

標籤:swift   nsnotification   nsnotificationcenter   通知   swift通知   

1.發通知。(以這條通知為例,通知名字:gameOverNotification。通知參數:title)

NSNotificationCenter.defaultCenter().postNotificationName("gameOverNotification", object: title)


2.在要監聽這則通知的viewDidload方法裡面添加觀察者,以便監聽這則通知

      NSNotificationCenter.defaultCenter().addObserver(self, selector: "gameOver:", name: "gameOverNotification", object: nil)

3.實現2中的selector,監聽到通知調用的方法

 func gameOver(title:NSNotification)    {      var str = title.object as String        self.titleLable.text = str    }

提醒:此處的通知調用方法中的參數必須為NSNotification,因為我們發的就是1條通知。


友情提示:在swift中,如果對項目的邏輯結構不是很清楚一般用通知。

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