如何在前台 iOS Swift 3.0 中接收推送通知？

Question

我想以前台状态显示 iOS 8.0 的推送通知。我在后台状态下收到通知，但不是在前台状态下。

Answer 1

extension AppDelegate: UNUserNotificationCenterDelegate {

    // Receive displayed notifications for iOS 10 devices.
    func userNotificationCenter(_ center: UNUserNotificationCenter,
                                willPresent notification: UNNotification,
                                withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

        completionHandler(UNNotificationPresentationOptions.alert)

        //completionHandler([.alert,.badge])
        let userInfo = notification.request.content.userInfo
        if let messageID = userInfo[gcmMessageIDKey] {

        }

        // Print full message.
        print(userInfo)
        completionHandler([])
    }

    func userNotificationCenter(_ center: UNUserNotificationCenter,
                            didReceive response:UNNotificationResponse,
                            withCompletionHandler completionHandler: @escaping () -> Void) {
        let userInfo = response.notification.request.content.userInfo

        // Print message ID.
        if let messageID = userInfo[gcmMessageIDKey] {
            print("Message ID: \(messageID)")
        }

        // Print full message.
        print(userInfo)
        completionHandler()
    }
}