sign method

@override Future<Map<String, dynamic>> sign(String url)

Implementation

@override
Future<Map<String, dynamic>> sign(url) async {
  final dynamic response = await methodChannel.invokeMethod('sign', url);

  // 转换为JSON字符串再解析
  final jsonString = jsonEncode(response);
  return jsonDecode(jsonString) as Map<String, dynamic>;
}