updateStartLevel method Null safety

Future<bool> updateStartLevel(
  1. int startLevel
)

更新最小显示层级,

iOS独有

Implementation

Future<bool> updateStartLevel(int startLevel) async {
  if (!Platform.isIOS) {
    return false;
  }
  if (startLevel < 4) {
    return false;
  }
  bool ret = await BMFMapDispatcherFactory.instance.overlayDispatcher
      .updateTextMember(this.methodChannel,
          {'id': this.id, 'member': 'startLevel', 'value': startLevel});
  if (ret) {
    this.startLevel = startLevel;
  }
  return ret;
}