swift

• 订阅通知

NotificationCenter.default.addObserver(self, selector: #selector(disconnect), name: Notification.Name("disconnect"), object: nil)

@objc func disconnect(){
        isConnected = false
    }   

• 发通知

 NotificationCenter.default.post(name: Notification.Name("disconnect"), object: nil)

• 移除通知

    deinit {
       NotificationCenter.default.removeObserver(self)
   }

参考博客：
Swift 通知实现

通知传值，userInfo

• 发通知

    func peripheral(_ peripheral: CBPeripheral, didReadRSSI RSSI: NSNumber, error: Error?) {

        NotificationCenter.default.post(name: Notification.Name("rssi"), object: self, userInfo: ["rssi":RSSI])

    }
    

• 订阅通知

    override func viewDidLoad() {
        super.viewDidLoad()
        
        NotificationCenter.default.addObserver(self, selector: #selector(readRSSI(notice:)), name: NSNotification.Name(rawValue: "rssi"), object: nil)
        }

    @objc func readRSSI(notice:NSNotification){
         let rssi:NSNumber = notice.userInfo!["rssi"] as! NSNumber
        rssiValueLabel.text = String(rssi.intValue)
    }

参考博客：
Swift 通知NSNotificationCenter userInfo

iOS 9 以后通知不再需要手动移除

iOS 9 以后通知不再需要手动移除

oc

iOS 通知的简单使用