swift通知快速创建

相关链接

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• Swift - 使用NotificationCenter发送通知，接收通知
  

直接监控系统方法

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var backgroundObserver :NSObjectProtocol?
// object必须是nil，否则貌似没反应
backgroundObserver = NoticeCenter.addObserver(forName: NSNotification.Name.UIApplicationDidEnterBackground, object: nil, queue: OperationQueue.main) { (notification) in
  print("******** 程序进入后台")
}

deinit {
  // 移除通知
  NoticeCenter.removeObserver(backgroundObserver!)
}

自定义方法

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获取全局通知方法

let NoticeCenter = NotificationCenter.default // 获取NotificationCenter

发送通知

NoticeCenter.post(name: NSNotification.Name(rawValue: "WebMusicState"), object: self, userInfo: ["appState":"applicationWillEnterForeground"])

注册通知

使用block方法

var WebMusicStateObserver :NSObjectProtocol?

// 注册通知
WebMusicStateObserver = NoticeCenter.addObserver(forName: NSNotification.Name(rawValue: "WebMusicState"), object: nil, queue: OperationQueue.main) { (notification) in

  print("********** notification \(String(describing: notification.userInfo!["appState"]!))")
}

deinit {
  // 移除通知
  NoticeCenter.removeObserver(WebMusicStateObserver!)
}

使用selector方法

// 注册通知
NoticeCenter.addObserver(self, selector: #selector(appStateChange(_:)), name: NSNotification.Name(rawValue: "WebMusicState"), object: nil)

// 调取的方法
@objc func appStateChange(_ notification: Notification) {
  print("********** notification \(String(describing: notification.userInfo!["appState"]!))")
}

deinit {
  //移除通知监听
  NotificationCenter.default.removeObserver(self)
}