通知

创建一个发通知的对象

import UIKit

class People: NSObject {

    var title ="title"

    

    overrideinit() {

        ／／发送通知

        NotificationCenter.default.post(name:Notification.Name(rawValue:"gameOverNotification"), object: title)

    }

    

}

／／ViewController

import UIKit

class ViewController: UIViewController {

    overridefunc viewDidLoad() {

        super.viewDidLoad()

        

        ／／注册通知

        NotificationCenter.default.addObserver(self, selector: #selector(ViewController.makeSomething(_:)), name:NSNotification.Name(rawValue:"gameOverNotification"), object: nil)

／／创建People对象时会调用init方法发送通知，注意注册与发送通知名要一致

        _ =People()

        

    }

    

／／接收到通知后执行的方法

    func makeSomething(_ title:Notification){

    

        let str = title.objectas! String

        print(str)

    }

//当视图消失时调用deinit方法移除通知

deinit {

        

        NotificationCenter.default.removeObserver(self)

    }

    overridefunc didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        

        

    }

}