flutter 无法监听到消息通知

当有消息到到达时，一直提示 “UNUserNotificationCenter delegate received call to -userNotificationCenter:didReceiveNotificationResponse:withCompletionHandler: but the completion handler was never called.”。

我的的 AppDelegate.swift如下

import UIKit
import Flutter




import umeng_push_sdk;
import UserNotifications;





@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
GeneratedPluginRegistrant.register(with: self)
if #available(iOS 10.0, *) {

UNUserNotificationCenter.current().delegate = self

} else {

// Fallback on earlier versions

}
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}



//iOS10新增：处理前台收到通知的代理方法

@available(iOS 10.0, *)

override func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

let userInfo = notification.request.content.userInfo

if notification.request.trigger is UNPushNotificationTrigger {

//应用处于前台时的远程推送接受
NSLog("-----------willPresentNotification");

//关闭友盟自带的弹出框

UMessage.setAutoAlert(false)

//必须加这句代码

UMessage.didReceiveRemoteNotification(userInfo)

} else {

//应用处于后台时的本地推送接受

}

//当应用处于前台时提示设置，需要哪个可以设置哪一个

completionHandler(UNNotificationPresentationOptions(rawValue: UNNotificationPresentationOptions.RawValue(
UInt8(UNNotificationPresentationOptions.sound.rawValue) | UInt8(UNNotificationPresentationOptions.badge.rawValue) | UInt8(UNNotificationPresentationOptions.alert.rawValue))))

}





//iOS10新增：处理后台点击通知的代理方法

@available(iOS 10.0, *)

override func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

let userInfo = response.notification.request.content.userInfo

if response.notification.request.trigger is UNPushNotificationTrigger {

//应用处于前台时的远程推送接受

//关闭友盟自带的弹出框

UMessage.setAutoAlert(false)

//必须加这句代码

UMessage.didReceiveRemoteNotification(userInfo)

} else {

//应用处于后台时的本地推送接受

}

}

}