setMapRegionWillChangeCallback method Null safety

void setMapRegionWillChangeCallback(
  1. {required BMFMapRegionChangeCallback callback}
)

设置地图区域即将改变时会调用接口

BMFMapRegionChangeCallback callback 回调接口

Implementation

void setMapRegionWillChangeCallback(
    {required BMFMapRegionChangeCallback callback}) {
  _methodChannelHandler.setMapRegionWillChangeCallback(callback);
}