AppDelegate从不获取要求CKQuerySubscription的didReceiveRemoteNotification [英] AppDelegate Never Gets Its didReceiveRemoteNotification Called For CKQuerySubscription

问题描述

我正在尝试让iOS应用程序监听CKQuerySubscription的更改.数据是通过远程iOS应用程序传输的.我已经有一个macOS应用程序，该应用程序确实会接收远程iOS应用程序发送的数据.我遇到麻烦的iOS应用已订阅.但是，它的AppDelegate从未在didReceiveRemoteNotification方法中收到呼叫.

I'm trying to let the iOS app listen to CKQuerySubscription changes. Data is transmitted by a remote iOS app. I already have a macOS application, which does receive data sent by the remote iOS app. The iOS app I have trouble with already has a subscription. Yet, its AppDelegate never receives a call in the didReceiveRemoteNotification method.

import UIKit
import UserNotifications
import CloudKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        /* notifications */
        let center  = UNUserNotificationCenter.current()
        center.delegate = self
        UNUserNotificationCenter.current().getNotificationSettings { (settings) in
            switch settings.authorizationStatus {
            case .authorized:
                print("You already have permission")
                DispatchQueue.main.async() {
                    application.registerForRemoteNotifications()
                }
            case .denied:
                print("setting has been disabled")
            case .notDetermined:
                print("Let me ask")
                UNUserNotificationCenter.current().requestAuthorization(options: []) { (granted, error) in
                    if error == nil {
                        if granted {
                            print("you are granted permission")
                            DispatchQueue.main.async() {
                                application.registerForRemoteNotifications()
                            }
                        }
                    }
                }
            }
        }
        return true
    }
}

    func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
        print("Failed to register notifications_ error:", error)
    }

    func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
        print("Receiving data...") // never called...
    }
}

我具有一些功能，如下所示.我不知道该应用是否需要push notifications.现在，它已打开.

I have some capabilities on as shown below. I don't know if the app needs push notifications. For now, it's turned on.

那我的iOS应用为什么不接到远程通知电话?我将应用程序与实际设备而非模拟器配合使用.谢谢.

So why doesn't my iOS app get the remote notification call? I'm using the app with an actual device, not a simulator. Thanks.

编辑:创建记录更改的订阅

EDIT: Creating a subscription to a record change

class HomeViewController: UIViewController {
    override func viewDidLoad() {
        registerSubscription()
    }

    func registerSubscription() {
        let cloudContainer = CKContainer(identifier: "iCloud.com.xxx.XXXXX")
        let privateDB = cloudContainer.privateCloudDatabase
        let predicate = NSPredicate(format: "TRUEPREDICATE")
        let subscription = CKQuerySubscription(recordType: "PrivateRecords", predicate: predicate, options: .firesOnRecordCreation)
        let notification = CKNotificationInfo()
        subscription.notificationInfo = notification
        privateDB.save(subscription, completionHandler: ({returnRecord, error in
            if let err = error {
                print("Subscription has failed: \(err.localizedDescription)")
            } else {
                print("Subscription set up successfully")
                print("Subscription ID: \(subscription.subscriptionID)")
            }
        }))
    }
}

推荐答案

还有更多可以检查的内容.

There are a few more things you can check.

首先，请确保在应用程序委托中实现didReceiveRemoteNotification:

First, make sure you implement didReceiveRemoteNotification in your app delegate:

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any]) {  
  let dict = userInfo as! [String: NSObject]
  let notification = CKNotification(fromRemoteNotificationDictionary: dict)

  if let sub = notification.subscriptionID{
    print("iOS Notification Received: \(sub)")
  }
}

您还可以检查其他几件事:

There are also a few other things you can check:

1. 尝试在CloudKit仪表板中删除您的CKQuerySubscription，然后再次运行您的iOS代码进行注册.订阅会显示在仪表板上吗?
2. CloudKit日志是否显示已发送通知?它列出了所有推送到设备的通知.
3. 如果您使用的是静默推送通知，请尝试在后台模式"功能中(在远程通知的正上方)启用背景获取.

1. Try deleting your CKQuerySubscription in the CloudKit dashboard, then run your iOS code again that registers it. Does the subscription show up in the dashboard?
2. Does the CloudKit log show that a notification was sent? It lists all notifications that were pushed to a device.
3. If you are using silent push notifications, try enabling Background fetch in the Background Modes capability (right above Remote notifications).

如果您执行所有操作后仍然无法使用，可以共享您的CKQuerySubscription代码吗?

If you do all that and it still doesn't work, can you share your CKQuerySubscription code?

-更新-

尝试在CKNotificationInfo对象上设置一些其他属性.有一些带有通知的晦涩错误，通常可以通过设置以下几个属性来规避:

Try setting some additional attributes on your CKNotificationInfo object. There are some obscure bugs with notifications that can usually be circumvented by setting a couple properties like this:

notification.shouldSendContentAvailable = true
notification.alertBody = "" //(Yes, a blank value. It affects the priority of the notification delivery)

您还可以尝试将谓词设置为:NSPredicate(value: true)

You can also try setting your predicate to: NSPredicate(value: true)

此外，您的privateDB.save方法返回什么?它说成功还是失败?

Also, what does your privateDB.save method return? Does it say it succeeds or fails?

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