React Native-MapView中UrlTile的动态URL

Question

我正在使用外部地图，在React Native中使用UrlTile这样的MapView，如下所示：

$OAUTH2_CLIENT_ID = 'XXXXX';
$OAUTH2_CLIENT_SECRET = 'XXXXX';
$client = new Google_Client();
$client->setAccessType('offline');
$client->setApprovalPrompt('force');
$client->setClientId($OAUTH2_CLIENT_ID);
$client->setClientSecret($OAUTH2_CLIENT_SECRET);
$client->setScopes('https://www.googleapis.com/auth/youtube');
$redirect = filter_var('http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'],
    FILTER_SANITIZE_URL);
$client->setRedirectUri($redirect);
$service = new Google_Service_YouTube($client);                            
if (isset($_GET['code'])){
    $accessToken = $client->fetchAccessTokenWithAuthCode($_GET['code']);
    $client->setAccessToken($accessToken);
    $test=$client->getAccessToken();    
    //TEST REFRESH TOKEN
    print_r($test);
    sleep(10);
    $client->fetchAccessTokenWithRefreshToken($client->getRefreshToken());
    $test=$client->getAccessToken();
    print_r($test);                                                         
  }    

// Check to ensure that the access token was successfully acquired.
if ($client->getAccessToken()) {
 ... 
  foreach ($files as $file){    
      if ($client->isAccessTokenExpired()) {
         $client->fetchAccessTokenWithRefreshToken($client->getRefreshToken());
         file_put_contents($credentialsPath, json_encode($client->getAccessToken()));
       } // end if token expired                                     
  ====CALL YOUTUBE API HERE IN FOREACH LOOP ===
  }// end foreach files

我想知道是否存在一种基于z，y和x值的动态URL。原因是我希望能够在本地存储图块，然后检查图块是否在本地使用，否则请使用外部URL。我有什么办法可以做到这一点？