Question

NotificationCenter.default.post在闭包中不起作用

我正在和通知观察员一起上课

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

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

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

在同一个类中具有处理通知的方法

@objc func methodOfReceivedNotification(notification: Notification) {
    print("Notification Received")
}

当我尝试使用下面的代码从另一个类中发布观察者时，它工作正常

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

但是，当尝试在网络方法的关闭响应中发布相同内容时，它并没有调用methodOfReceivedNotification

关闭代码

       executeHttpReq(url: getUIUrl(), getparametersDict: getParameters, onSuccess: { (response, status,isEod) -> (
        Any, String,Bool) in

    NotificationCenter.default.post(name: Notification.Name("Start"), object: nil)
        return (response,status,isEod)
    }, onFailure: { (error) in
        //todo send stop event to the caller

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

    })

代码中是否有任何错误，请提出建议。

Answer 1

当通知处于关闭状态时，尝试将通知发布到主队列中。

DispatchQueue.main.async {
   NotificationCenter.default.post(name: Notification.Name("Start"), object: nil)
}

Answer 2

创建扩展名

extension Notification.Name {
    static let Start = Notification.Name("Start")
    static let Stop = Notification.Name("Stop")
}

在viewDidLoad

NotificationCenter.default.addObserver(self, selector: #selector(onDidReceiveData(_:)), name: .Start, object: nil)

在您的viewController

 @objc func onDidReceiveData(_ notification:Notification) {
        print("image deleted by user")
       // self.isExcluded = true
   }

主队列中的火灾通知

DispatchQueue.main.async {
   NotificationCenter.default.post(name: .Start, object: nil)
}

尝试使用我现有的代码。

RequestManager.shared.doPost(strURL:url, parameter: params) { (response, error) in
            guard error == nil else {
                return
            }
            do {
                if let isSucess = response!["IsSuccessStatusCode"] as? Bool{

                    if isSucess == true{

                                DispatchQueue.main.async {


                                    NotificationCenter.default.post(name: .Start, object: nil)

                                }
                            }
                        }
                    }
                    else{
                        self.showValidationAlert(message: "Try after some time")
                    }
                }
                else{
                    self.showValidationAlert(message: "Try after some time")
                }
            }

        }
    }

通知观察者无法迅速进行关闭

2 个答案: