ios - UNUserNotificationCenter didReceive 未被调用

Question

当我发送推送通知时，应用程序在前台 willPresent 被调用。 didReceive 永远不会被调用。当应用程序在后台并收到推送通知时，会显示警报，但应用程序不会调用 didReceive 或 willPresent。

在 Project > Capabilities 中，我检查了后台模式 Location updates 和 Remote notifications。位置更新用于不相关的代码。

我还启用了推送通知。这工作正常，因为他们正在收到。

我已经在我的 AppDelegate 中实现了 UNUserNotificationCenter 通知内容，如下所示:

import UserNotifications
...

class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {
...

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        ...
        registerForPushNotifications(application: application)
        ...
    }

    // MARK: - Push Notifications

    func registerForPushNotifications(application: UIApplication) {
        let notificationCenter = UNUserNotificationCenter.current()
        notificationCenter.delegate = self
        notificationCenter.requestAuthorization(options: [.badge, .sound, .alert], completionHandler: {(granted, error) in
            if (granted)
            {
                UIApplication.shared.registerForRemoteNotifications()
            }
            else{
                //Do stuff if unsuccessful...
                print("Unsuccessful in registering for push notifications")
            }
        })
    }

    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        //convert the deviceToken to a string
        let deviceTokenString = deviceToken.map { String(format: "%02.2hhx", arguments: [$0]) }.joined()

        let ud = UserDefaults.standard
        ud.set(deviceTokenString, forKey: "deviceToken")
    }

    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        //Handle the notification
        print("User Info = ",notification.request.content.userInfo)
        completionHandler([.alert, .badge, .sound])
    }

    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
        //handle the notification
        print("Push notification: ",response.notification.request.content.userInfo)

        ... code to import the notification data into Core Data.

        completionHandler()
    }

...
}

知道为什么 didReceive 没有被调用吗？

这是收到的推送通知:

[AnyHashable("aps"): {
    alert = "[name] has added you as a friend.";
    category = "NEWS_CATEGORY";
    "related_user_id" = 55;
    sound = default;
    type = "friend_request";
}]

iOS 10.1、Swift 3。

Answer 1

我发现在获得权限后我需要设置delegate。

否则，当您第一次使用应用程序午餐时，您在获得权限之前注册了委托(delegate)并且没有触发 didReceive 函数 - 这仅在您第一次运行应用程序时发生，在终止并重新启动后它被调用就好了。

见下文:

 UNUserNotificationCenter.current().requestAuthorization(options: authOptions, completionHandler: { (granted, error) in
        if granted {
            // Register after we get the permissions.
            UNUserNotificationCenter.current().delegate = self
        }
    })