Swift和Firebase雲消息傳遞通知僅在應用程序泄露時起作用

Question

當應用程序關閉時，我有FCM通知工作，但當應用程序打開並在前臺運行時，我無法讓它們正常工作。 「

我收到以下錯誤」警告：應用程序委託收到對應用程序的調用：didReceiveRemoteNotification：fetchCompletionHandler：但完成處理程序從未調用。我一直在谷歌搜索幾個小時，閱讀firebase文檔，但我不確定如何克服這個錯誤。

// [START receive_message] 
func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject], 
       fetchCompletionHandler completionHandler: (UIBackgroundFetchResult) -> Void) { 
    // If you are receiving a notification message while your app is in the background, 
    // this callback will not be fired till the user taps on the notification launching the application. 
    // TODO: Handle data of notification 

    // Print message ID. 
    print("Message ID: \(userInfo["gcm.message_id"]!)") 

    // Print full message. 
    print("%@", userInfo) 

    ////new code to help with error but no luck 
    if application.applicationState == UIApplicationState.Active { 
     print("%@", userInfo) 
     print("message recieved") 
    } 
} 

加入以下代碼沒有工作

if application.applicationState == UIApplicationState.Active { 
     print("%@", userInfo) 
     print("message recieved") } 

任何幫助或建議，將不勝感激

Answer 1

您收到此錯誤 Warning: Application delegate received call to -application:didReceiveRemoteNotification:fetchCompletionHandler: but the completion handler was never called.因爲你沒有返回FechedCompletionHandler 。

你應該回到這個completionHandler用在適當的地方適當UIBackgroundFetchResult值，UIBackgroundFetchResult是一個枚舉誰的價值觀是：

• NewData
• 的無數據
• 失敗

例如：閣下didReceiveRemoteNotification將變爲：

func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject], 
      fetchCompletionHandler completionHandler: (UIBackgroundFetchResult) -> Void) { 
// If you are receiving a notification message while your app is in the background, 
// this callback will not be fired till the user taps on the notification launching the application. 
// TODO: Handle data of notification 

// Print message ID. 
print("Message ID: \(userInfo["gcm.message_id"]!)") 

// Print full message. 
print("%@", userInfo) 

////new code to help with error but no luck 
if application.applicationState == UIApplicationState.Active { 
    print("%@", userInfo) 
    print("message recieved") 
    completionHandler(.NewData) 
} 

}