我已經(jīng)在現(xiàn)有應用中配置了GCM，并且在那里收到了通知?，F(xiàn)在我面臨兩個問題：1）我退出應用程序時未收到通知，或者應用程序在后臺。2）我沒有在iPhone的通知區(qū)域中收到通知，僅當我的應用程序正在運行時，我才直接在該區(qū)域接收警報消息。當我下拉通知區(qū)域時，我在xcode的控制臺中收到此消息“無法連接到GCM：操作無法完成。（com.google.gcm錯誤2001。）”我的PHP文件在下面<?php// Payload data you want to send to iOSdevice(s)// (it will be accessible via intent extras)    $data = array( 'message' => 'Hello World!');// The recipient registration tokens for this notification// http://developer.android.com/google/gcm/ $ids = array( 'kucy6xoUmx********eeRsla' );// Send a GCM pushsendGoogleCloudMessage(  $data, $ids );function sendGoogleCloudMessage( $data, $ids ){    // Insert real GCM API key from Google APIs Console    // https://code.google.com/apis/console/            $apiKey = 'AIz******9JA';    // Define URL to GCM endpoint    $url = 'https://gcm-http.googleapis.com/gcm/send';    // Set GCM post variables (device IDs and push payload)         $post = array(                    'registration_ids'  => $ids,                    'data'              => $data,                                       );    // Set CURL request headers (authentication and type)           $headers = array(                         'Authorization: key=' . $apiKey,                        'Content-Type: application/json'                    );    // Initialize curl handle           $ch = curl_init();    // Set URL to GCM endpoint          curl_setopt( $ch, CURLOPT_URL, $url );    // Set request method to POST           curl_setopt( $ch, CURLOPT_POST, true );    // Set our custom headers           curl_setopt( $ch, CURLOPT_HTTPHEADER, $headers );    // Get the response back as string instead of printing it           curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );    // Set JSON post data    curl_setopt( $ch, CURLOPT_POSTFIELDS, json_encode( $post ) );    // Actually send the push       $result = curl_exec( $ch );    // Error handling    if ( curl_errno( $ch ) )    {        echo 'GCM error: ' . curl_error( $ch );    }?>