iOS 推送通知 - didReceiveRemoteNotification :fetchCompletionHandler: never called in foreground

Question

我已经在我的应用程序中实现了远程通知，但是我遇到了 didReceiveRemoteNotification:fetchCompletionHandler: 的问题。

当手机屏幕锁定时，我会收到通知。如果用户滑动通知，应用会返回前台并调用 didReceiveRemoteNotification:fetchCompletionHandler:。

但是，如果应用程序在前台运行，则永远不会调用 didReceiveRemoteNotification:fetchCompletionHandler:。可能是什么原因？

我正在使用 iOS 10.3.2

Answer 1

您正在使用哪个 iOS 版本？

There are different methods for iOS 9 and iOS 10.

以下是适用于 iOS 10 的

    //Called when a notification is delivered to a foreground app.
    @available(iOS 10.0, *)
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

    }


    //Called to let your app know which action was selected by the user for a given notification.
    @available(iOS 10.0, *)
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

    }

对于 iOS 9，请确保在 didBecomeActive 中注册您的通知

UIApplication.shared.registerUserNotificationSettings(UIUserNotificationSettings(types: [.sound, .alert, .badge], categories: nil))
UIApplication.shared.registerForRemoteNotifications()

并在您的didReceiveRemoteNotification

中

func application(_ application: UIApplication, didReceiveRemoteNotification data: [AnyHashable : Any]) {

if application.applicationState == .active {
//foreground state
 }

}

最好的方法是在 didReceiveRemoteNotification 中放置一个调试器并进一步检查。