changeGroupDescription method
更新群描述
Implementation
Future<EMGroup> changeGroupDescription(
String groupId,
String desc,
) async {
Map req = {'desc': desc, 'groupId': groupId};
Map result =
await _channel.invokeMethod(EMSDKMethod.updateDescription, req);
EMError.hasErrorFromResult(result);
return EMGroup.fromJson(result[EMSDKMethod.updateDescription]);
}