没有互联网连接时检索信息的解决方案

Question

在我的应用中，我有一个表单，用户可以填写该表单并通过 SOAP 请求将其发送给我们。

发送的表格：

但我有一个问题，我没有互联网连接，我无法使用我的 SOAP 请求发送数据。

所以首先我将请求保存在 Core Data 中，所以这里没关系...当用户在应用程序上时，我会执行预定请求以查看他们是否是 Core Data 中的发送请求。

但是如果应用程序没有运行呢？在 Android 中我使用后台服务，但在 Apple 中这是不可能的：

Android Services equivalent in iOS Swift

有人有检索数据的想法吗？

肥皂功能：

func soapCall(fonction:String, soapMessageParamsTab:[SoapMessageParams], completion: @escaping (_ strData: NSString)-> ()/*, completion: @escaping (_ result: Int, _ resultContactWebId: Int)->()*/){
        let soapRequest = AEXMLDocument()
        let attributes = ["xmlns:SOAP-ENV" : "http://schemas.xmlsoap.org/soap/envelope/", "xmlns:ns1" : namespace, "xmlns:xsd" : "http://www.w3.org/2001/XMLSchema", "xmlns:xsi" : "http://www.w3.org/2001/XMLSchema-instance", "xmlns:SOAP-ENC" : "http://schemas.xmlsoap.org/soap/encoding/", "SOAP-ENV:encodingStyle" : "http://schemas.xmlsoap.org/soap/encoding/"]
        let envelope = soapRequest.addChild(name: "SOAP-ENV:Envelope", attributes: attributes)
        let body = envelope.addChild(name: "SOAP-ENV:Body")
        let sendLead = body.addChild(name: "ns1:"+fonction)

    for obj in soapMessageParamsTab {
        sendLead.addChild(name: obj.soapName, value: obj.soapValue, attributes: ["xsi:type" : "xsd:"+obj.soapType])
    }
        //sendLead.addChild(name: "xml", value: messageSoap, attributes: ["xsi:type" : "xsd:string"])


        let soapMessage = soapRequest.xmlString
        let messageSoapMinify = minify(soapMessage)


        //        URL Soap
        let urlString = soapServiceURL
        let url = URL(string: urlString)
        var theRequest = URLRequest(url: url!)

        //        Taille SoapMessage
        let msgLength = String(messageSoapMinify.characters.count)

        //        Soap Login
        let username = soapUsername
        let password = soapPassword
        let loginString = NSString(format: "%@:%@", username, password)
        let loginData: Data = loginString.data(using: String.Encoding.utf8.rawValue)!
        let base64LoginString = loginData.base64EncodedString(options: NSData.Base64EncodingOptions.lineLength64Characters)

        //        Requete Soap
        theRequest.addValue("text/xml; charset=utf-8", forHTTPHeaderField: "Content-Type")
        theRequest.addValue("Keep-Alive", forHTTPHeaderField: "Connection")
        theRequest.addValue(msgLength, forHTTPHeaderField: "Content-Length")
        theRequest.addValue("urn:ResponseAction", forHTTPHeaderField: "SOAPAction")
        theRequest.httpMethod = "POST"
        theRequest.httpBody = messageSoapMinify.data(using: String.Encoding.utf8, allowLossyConversion: true)
        theRequest.addValue("Basic \(base64LoginString)", forHTTPHeaderField: "Authorization")
        //        print("Request is \(theRequest.allHTTPHeaderFields!)")

        let session = Foundation.URLSession.shared

        let task = session.dataTask(with: theRequest, completionHandler: {data, response, error -> Void in

            if error != nil
            {
                print(error?.localizedDescription)
            }

            //print("Response Login: \(response)")
            //print("Error Login: \(error)")
            let strData = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)!
            //print("Body Login: \(strData)")

            completion(strData)
        })


        task.resume()

}

Answer 1

将 NSURLSession 与后台配置一起使用应该没问题。 注意：如果应用程序被用户明确杀死，计划的请求将被取消。仅当应用程序因任何原因（内存不足、崩溃等）被系统杀死时，此技巧才有效。如果应用程序被用户杀死，您将无能为力。后台获取可能是一种解决方案，但将由 iOS 决定是否以及何时唤醒应用程序以进行机会性获取。 这可以帮助您： https://blog.newrelic.com/2016/01/13/ios9-background-execution/

编辑： 本教程也很有用：https://www.raywenderlich.com/110458/nsurlsession-tutorial-getting-started