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为什么没有触发userNotificationCenter didReceive?

unusernotificationcenter push-notification swift ios

Vyacheslav · 技术社区 · 7 年前

这是我代码的一部分。我想用 UNUserNotificationCenter 和 UNUserNotificationCenterDelegate

此代码捕获应用程序处于前台状态时的通知事件。但是 "didReceive" 不是为后台状态激发的。

func application(_ application: UIApplication,
                         didFinishLaunchingWithOptions launchOptions:
            [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
            UNUserNotificationCenter.current().delegate = self
    application.registerForRemoteNotifications()
    return true
    }    
        func userNotificationCenter(_ center: UNUserNotificationCenter,
                                    willPresent notification: UNNotification,
                                    withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)
        {
            print("willPresent") /// This works
            completionHandler([.alert, .badge, .sound])
        }
        func userNotificationCenter(_ center: UNUserNotificationCenter,
                                    didReceive response: UNNotificationResponse,
                                    withCompletionHandler completionHandler: @escaping () -> Void) {
            print("didReceive") /// This doesn't work
            completionHandler()
        }

但如果我不使用 UNUserNotificationCenter.current().delegate = self 委托方法在后台正确激发。

func application(_ application: UIApplication,
                     didReceiveRemoteNotification userInfo: [AnyHashable: Any],
                     fetchCompletionHandler completionHandler: @escaping FetchCompletionHandler) {
        print("didReceiveRemoteNotification... \(userInfo)")
}

3 回复 | 直到 7 年前

quellish 7 年前

application(_:didReceiveRemoteNotification:fetchCompletionHandler:) 当应用程序收到静默推送通知时调用。静默推送通知可以在中传递。应用程序处于后台状态时,iOS会唤醒应用程序以执行用户不可见的后台处理。

无声推送通知具有 content-available

静默推送通知不应包含警报、徽章或声音。无声推送并不意味着对用户可见,它只是对应用程序的提示,即新的远程内容可用。

移除 提供的内容 来自推送通知负载的标志将导致iOS将其作为常规通知处理。将调用用户通知中心委托方法,而不是但您的应用程序将无法执行由通知触发的后台处理。

this tool

Hasti Ranjkesh 7 年前

这就是我在应用程序中处理推送通知的方式。我认为您需要实现所有这些方法来处理前台和后台模式下的所有iOS版本。

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

    if #available(iOS 10.0, *) {
        let center  = UNUserNotificationCenter.current()
        center.delegate = self
        center.requestAuthorization(options: [.sound,.alert,.badge], completionHandler: { (granted, error) in
            if error == nil {
                DispatchQueue.main.async {
                    application.registerForRemoteNotifications()
                }
            }
        })
    }
    else {
        let notificationTypes: UIUserNotificationType = [UIUserNotificationType.alert, UIUserNotificationType.badge, UIUserNotificationType.sound]
        let pushNotificationSettings = UIUserNotificationSettings(types: notificationTypes, categories: nil)
        application.registerUserNotificationSettings(pushNotificationSettings)
        application.registerForRemoteNotifications()
    }

}

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    let deviceTokenString = deviceToken.reduce("", {$0 + String(format: "%02X", $1)})
    print(deviceTokenString)
}

func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
    print("Failed to get token; error: \(error)")
}

@available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
    completionHandler([.alert,.sound])
     //do sth
}

@available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
     //do sth
}

// for iOS < 10
func application(_ application: UIApplication, didReceive notification: UILocalNotification) {
}

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
}

-1

nitin.agam 7 年前

willPresent:当你的应用在前台时收到通知时,会调用此方法。如果应用程序在后台,则此方法将不会调用。
didRecieve:当用户单击通知时调用此方法。

在后台状态下,当用户单击通知时,只调用“didRecieve”。