ios - swift ;来自 UNUserNotificationCenter 的 HTTP 请求不起作用 : The Internet connection appears to be offline

Question

我使用的是 Xcode 版本 9.4.1 (9F2000)。

我在AppDelegate.swift中有这段代码:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    UNUserNotificationCenter.current().delegate = self
    showPushButtons()
    return true
}
func httpRequest(file: String, postKey1: String, postValue1: String, postKey2: String, postValue2: String) {
    let url = URL(string: "https://www.example.com/\(file)")!
    var request = URLRequest(url: url)
    request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
    request.httpMethod = "POST"
    let postString = "\(postKey1)=\(postValue1)&\(postKey2)=\(postValue2)"
    request.httpBody = postString.data(using: .utf8)
    let task = URLSession.shared.dataTask(with: request) { data, response, error in
        guard let data = data, error == nil else {
            print("error=\(String(describing: error))")
            return
        }
        if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 {
            print("statusCode should be 200, but is \(httpStatus.statusCode)")
            print("response = \(String(describing: response))")
        }

        let responseString = String(data: data, encoding: .utf8)
        print("responseString = \(String(describing: responseString))")
    }
    task.resume()
}
func showPushButtons(){
    let replyAction = UNTextInputNotificationAction(
        identifier: "reply.action",
        title: "Reply to message",
        textInputButtonTitle: "Send",
        textInputPlaceholder: "Write some text here")

    let pushNotificationButtons = UNNotificationCategory(
        identifier: "allreply.action",
        actions: [replyAction],
        intentIdentifiers: [],
        options: [])

    UNUserNotificationCenter.current().setNotificationCategories([pushNotificationButtons])
}
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

    if  response.actionIdentifier  ==  "reply.action" {
        if let textResponse =  response as? UNTextInputNotificationResponse {
            let sendText =  textResponse.userText
            print("Received text message: \(sendText)")
            httpRequest(file: "message.php", postKey1: "message", postValue1: "Hello!", postKey2: "chat_user", postValue2: "Peter")
        }
    }
    completionHandler()
}

它的作用:

当收到推送通知并用力触摸时，将会出现一个文本字段和键盘(如 WhatsApp 等消息应用程序所示)。您可以编写一些文本并提交/发送。

您可以使用此行获取并打印提交的消息:

print("收到短信:\(sendText)")

这工作正常，没有任何问题。

但是当尝试像这样将数据发送到我的服务器时:

httpRequest(file: "message.php", postKey1: "message", postValue1: "Hello!", postKey2: "chat_user", postValue2: "David")

它不工作。无法访问我的服务器，并且我在控制台日志中收到如下错误:

Received text message: First try

2018-07-19 08:45:00.643935+0200 MyApp[4307:1502538] +[CATransaction synchronize] called within transaction

2018-07-19 08:45:00.644639+0200 MyApp[4307:1502538] +[CATransaction synchronize] called within transaction

2018-07-19 08:45:13.091958+0200 MyApp[4307:1502647] TIC TCP Conn Failed [1:0x1c4169a80]: 1:50 Err(50)

2018-07-19 08:45:13.093089+0200 MyApp[4307:1502647] Task <1E8151BB-7098-46CD-9F68-8AA0E320CB7D>.<1> HTTP load failed (error code: -1009 [1:50])

Received text message: Second try

2018-07-19 08:45:13.094756+0200 MyApp[4307:1503029] Task <1E8151BB-7098-46CD-9F68-8AA0E320CB7D>.<1> finished with error - code: -1009

2018-07-19 08:45:13.096208+0200 MyApp[4307:1502538] +[CATransaction synchronize] called within transaction

2018-07-19 08:45:13.096580+0200 MyApp[4307:1502538] +[CATransaction synchronize] called within transaction error=Optional(Error Domain=NSURLErrorDomain Code=-1009 "The Internet connection appears to be offline." UserInfo={NSUnderlyingError=0x1cc047320 {Error Domain=kCFErrorDomainCFNetwork Code=-1009 "(null)" UserInfo={_kCFStreamErrorCodeKey=50, _kCFStreamErrorDomainKey=1}}, NSErrorFailingURLStringKey=https://www.example.com/message.php, NSErrorFailingURLKey=https://www.example.com/message.php, _kCFStreamErrorDomainKey=1, _kCFStreamErrorCodeKey=50, NSLocalizedDescription=The Internet connection appears to be offline.})

我的函数 httpRequest() 似乎可以工作，因为我可以从 didFinishLaunchingWithOptions 调用它，如下所示:

httpRequest(file: "message.php", postKey1: "message", postValue1: "Hello!", postKey2: "chat_user", postValue2: "David")

没有任何问题。这也意味着我的域和服务器工作正常。

但是为什么我无法从 UNUserNotificationCenter 函数调用我的 httpRequest() 函数？

当收到推送通知时，我的应用程序当然处于后台或关闭状态。我是否需要一些特殊的代码才能使其在后台模式下工作？

Answer 1

这是我来自 AppDelegate.swift 的工作代码:

//  AppDelegate.swift

import UIKit
import UserNotifications

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {

    var window: UIWindow?
    var backgroundTask: UIBackgroundTaskIdentifier = UIBackgroundTaskInvalid

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        UNUserNotificationCenter.current().delegate = self
        pushAction()
        return true
    }
    func registerForPushNotifications() {
        UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) {
            (granted, error) in
            print("\nPermission granted: \(granted)\n")
            self.pushAction()
            guard granted else { return }
            self.getNotificationSettings()
        }
    }
    func getNotificationSettings() {
        UNUserNotificationCenter.current().getNotificationSettings { (settings) in
            print("\nNotification settings: \(settings)\n")
            guard settings.authorizationStatus == .authorized else { return }
            DispatchQueue.main.async(execute: {
                UIApplication.shared.registerForRemoteNotifications()
            })
        }
    }
    func httpRequest(file: String, postKey1: String, postValue1: String, postKey2: String, postValue2: String) {
        let url = URL(string: "https://www.example.com/\(file)")!
        var request = URLRequest(url: url)
        request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
        request.httpMethod = "POST"
        let postString = "\(postKey1)=\(postValue1)&\(postKey2)=\(postValue2)"
        request.httpBody = postString.data(using: .utf8)
        let task = URLSession.shared.dataTask(with: request) { data, response, error in
            guard let data = data, error == nil else {
                print("\nerror=\(String(describing: error))\n")
                return
            }
            if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 {
                print("\nstatusCode should be 200, but is \(httpStatus.statusCode)\n")
                print("\nresponse = \(String(describing: response))\n")
            }
            let responseString = String(data: data, encoding: .utf8)
            print("\nresponseString = \(String(describing: responseString))\n")
        }
        task.resume()
    }
    func application(_ application: UIApplication,
                     didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        let tokenParts = deviceToken.map { data -> String in
            return String(format: "%02.2hhx", data)
        }
        let token = tokenParts.joined()
        print("\nDevice Token: \(token)\n")
    }
    func application(_ application: UIApplication,
                     didFailToRegisterForRemoteNotificationsWithError error: Error) {
        print("\nFailed to register: \(error)\n")
    }
    func pushAction(){
        let replyAction = UNTextInputNotificationAction(
            identifier: "reply.action",
            title: "Reply to message",
            options:[],
            textInputButtonTitle: "Send",
            textInputPlaceholder: "Input/write text here")

        let pushNotificationButtons = UNNotificationCategory(
            identifier: "allreply.action",
            actions: [replyAction],
            intentIdentifiers: [],
            options: [])

        UNUserNotificationCenter.current().setNotificationCategories([pushNotificationButtons])
    }
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
//        If you don’t want to show notification when app is open, do something else here and make a return here.
//        Even if you don’t implement this delegate method, you will not see the notification on the specified controller. So, you have to implement this delegate and make sure the below line execute. i.e. completionHandler.
        completionHandler([.sound,.alert,.badge])
    }
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

        if response.actionIdentifier  ==  "reply.action" {
            if let textResponse =  response as? UNTextInputNotificationResponse {
                if UIApplication.shared.applicationState != .active{
                    self.registerBackgroundTask()
                }
                let sendText =  textResponse.userText
                print("\nReceived text message: \(sendText)\n")
                DispatchQueue.global(qos: .background).async {
                    self.httpRequest(file: "message.php", postKey1: "message", postValue1: sendText, postKey2: "user", postValue2: "Peter")
                }
            }
        }
        completionHandler()
    }
    func  registerBackgroundTask() {
        backgroundTask = UIApplication.shared.beginBackgroundTask { [weak self] in
            self?.endBackgroundTask()
        }
        assert(backgroundTask != UIBackgroundTaskInvalid)
    }
    func endBackgroundTask() {
        print("\nBackground task ended.\n")
        UIApplication.shared.endBackgroundTask(backgroundTask)
        backgroundTask = UIBackgroundTaskInvalid
    }
}

不要忘记:

-创建推送证书

– 您将在控制台日志中看到您的设备 token

– 在您的 aps 有效负载中添加 "category":"allreply.action"，如下所示:

{
    "aps":{
        "alert":{
            "title":"Hello",
            "body":"This is a test!"
            },
            "badge":0,
            "sound":"default",
            "category":"allreply.action"
    }
}

在功能中启用推送通知和后台模式:

非常感谢 to Raza K. from Freelancer.com !