ios - iOS 中如何保存 Web 服务调用并在有互联网连接时使用它？

Question

我正在尝试实现Web服务调用，当用户截图时，我已经使用下面的方法成功实现了它。

  //this method get called when screenshot captured
func detectScreenShot()  {
    let mainQueue = OperationQueue.main
    NotificationCenter.default.addObserver(forName: NSNotification.Name.UIApplicationUserDidTakeScreenshot,
                                           object: nil,
                                           queue: mainQueue,
                                           using: { notification in
                                            WEBSERVICE_INTERFACE.webServiceWithPostJSONParameters(param: nil, methodName: Constants.URLs.screenshot, headers: Constants.Headers.urlEncoded, showProgress: false, completion: { (response) in

                                                if let response = response{
                                                    let response = BaseResponse(JSONString : response)
                                                    if let message = response?.message{
                                                        LIMITUtils.showAlertMessage(message: message)
                                                    }
                                                }

                                            })

    })
}

但现在我有这样的场景，假设用户通过关闭互联网连接来截取屏幕截图，那么不会发生任何 Web 服务调用，用户将从中受益。现在我想要某种解决方案，如果没有可用的连接，我可以保存网络服务调用，并在互联网连接可用时进行相同的调用。谁能建议我如何继续此操作？

Answer 1

使用Reachability要检查互联网是否可用，请编写以下代码来检查互联网

//MARK:- check internet connection
    func checkInternetStatus() {
        NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(reachabilityChanged(_:)), name:ReachabilityChangedNotification, object: nil)
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)) {
            //Check for Internet Status
            do {
                self.reachability = try Reachability.reachabilityForInternetConnection()
                try self.reachability?.startNotifier()
            } catch {
                jprint("Errore")
                return
            }
        }
    }

    func reachabilityChanged(note:NSNotification) {
        let Status = reachability?.currentReachabilityStatus  //note.object as! Reachability
        if Status != .NotReachable  {
            jprint("isNetworkAvailable = true")
            isNetworkAvailable = true
        } else {
            jprint("isNetworkAvailable = false")
            ShowFlinntAlert("No internet", description: "Your internet connection seems to be down")
            isNetworkAvailable = false
        }
    }

在 API 调用之前只需检查

guard isInternetAvailable() else {
    return
}