updateSubTitle method
- String subtitle
 
更新subTitle
Implementation
Future<bool> updateSubTitle(String subtitle) async {
  if (null == subtitle) {
    return false;
  }
  bool ret = await BMFMapDispatcherFactory.instance.markerDispatcher
      .updateMarkerMember(this.methodChannel, {
    'id': this.Id,
    'member': 'subtitle',
    'value': subtitle,
  });
  if (ret) {
    this.subtitle = subtitle;
  }
  return ret;
}