静默推送不会触发代码执行 [英] Silent push not triggering the code execution

问题描述

我每30分钟发送一次静默推送通知，我希望在静默通知到达设备时执行代码.但是经过大量尝试，我无法获得结果.当我在设备上测试它(带有Xcode的版本)时，一切正常，将其上传到TestFlight并从TestFlight下载该版本后，我无法将应用从后台唤醒或从终止状态唤醒.只需在启动应用程序或应用程序进入前台后执行此代码.

I'm sending silent push notification every 30 minutes, I want execute code when silent notification arrives to device. But after lot of tries, I can't get the result. When I testing it on my device (with version from Xcode) everything works, after uploading it to TestFlight and downloading the version from TestFlight I'm not able to wake the app from background or wake it from terminated state. Simply this code executes after launching an app or app goes to foreground.

根据 Apple文档我应该能够唤醒该应用程序并执行30秒的代码. 我已确认静默通知已成功发送.我遗漏了一些东西?

According to Apple documentation I should be able to wake the app and execute the 30 seconds of a code. I verified that silent notification is successfully delivered. I have missing something?

AppDelegate.swift

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
                 fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    if let messageID = userInfo[gcmMessageIDKey] {
        print("Message ID: \(messageID)")
    }

    guard (userInfo["aps"] as? [String?: Any]) != nil else {
        Analytics.logEvent("fetch_failed", parameters: nil)
        completionHandler(.failed)
        return
    }

    let login = UserDefaults.standard.value(forKey: "username") as? String
    let password = UserDefaults.standard.value(forKey: "password") as? String

    if login != nil && password != nil {
        let session = URLSession.shared
        let url = URL(string: "https://example.com")!
        let body_values = Data(("credentials...").utf8)
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
        request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
        request.setValue("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36", forHTTPHeaderField: "User-Agent")
        request.httpBody = body_values

        let loadDataTask = session.dataTask(with: request) { data, response, error in
            if let httpResponse = response as? HTTPURLResponse {
                print(httpResponse.statusCode)
                if httpResponse.statusCode == 200 {
                    if let data = data, let dataString = String(data: data, encoding: .utf8) {
                        let htmlparser: HTMLParser = HTMLParser()
                        let numberOfEmails = htmlparser.getXPathvalue(xPath: "/html/body/div[1]/div[3]/div[3]/a[1]", fromHtml: dataString)
                        self.setNotification(title: "New emails!", body: "Count of new emails: \(numberOfEmails)")
                        completionHandler(.newData)
                    }
                    else {
                        completionHandler(.failed)
                    }
                }
                else {
                    completionHandler(.failed)
                }
            }
            else {
                completionHandler(.failed)
            }
        }
        loadDataTask.resume()
    }
    else {
        completionHandler(.failed)
    }
}

PushNotification.js

var message = {
  notification: {
  },
  apns: {
     headers: {
        'apns-priority' : '5',
        'apns-push-type' : 'background'
     },
     payload: {
         aps: {
            'content-available' : 1
         }
     }
   },
   topic: topic
};

推荐答案

There are two main things you must pay attention to that are discussed in this apple forum discussion!. The first one is that the app can't be terminated, otherwise it won't launch the app, it must be foreground or background. And the other one is that you need to enable the background mode in Info.plist to make it work. Other than that there are situations when the system won't just refresh your app, the greatest guarantee you have is only if the user clicks a notification your app receives, otherwise for some privacy concerns it may not work.

这篇关于静默推送不会触发代码执行的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！