HarmonyOS Map Kit '我的位置'按钮如何更改位置

import { MapComponent, mapCommon, map, sceneMap } from '@kit.MapKit'; 
import { AsyncCallback } from '@kit.BasicServicesKit'; 
import BusinessError from "@ohos.base"; 
import { geoLocationManager } from '@kit.LocationKit'; 
 
 
@Entry 
@Component 
struct HuaweiMapDemo { 
  private mapOption?: mapCommon.MapOptions; 
  private callback?: AsyncCallback<map.MapComponentController>; 
  private mapController: map.MapComponentController = new map.MapComponentController(); 
  @State latitude:number = 39.9; 
  @State longitude:number = 116.4; 
  aboutToAppear(): void { 
    // 地图初始化参数，设置地图中心点坐标及层级 
    this.mapOption = { 
      position: { 
        target: { 
          latitude: this.latitude, 
          longitude: this.longitude 
        }, 
        zoom: 10 
      } 
    }; 
    // 地图初始化的回调 
    this.callback = async (err, mapController) => { 
      if (!err) { 
        // 获取地图的控制器类，用来操作地图 
        this.mapController = mapController; 
        // 启用我的位置按钮 
        // this.mapController.setMyLocationControlsEnabled(false); 
 
      } 
    }; 
 
  } 
  build() { 
    Stack() { 
      // 调用MapComponent组件初始化地图 
      MapComponent({ mapOptions: this.mapOption, mapCallback: this.callback }).width('100%').height('100%'); 
      Row(){ 
        //默认参数下，图标、文字、背景都存在 
        LocationButton().onClick((event: ClickEvent, result: LocationButtonOnClickResult)=>{ 
          let requestInfo:geoLocationManager.CurrentLocationRequest = {'priority': geoLocationManager.LocationRequestPriority.FIRST_FIX, 'scenario': geoLocationManager.LocationRequestScenario.UNSET,'maxAccuracy': 0}; 
          let locationChange = (err:BusinessError.BusinessError, location:geoLocationManager.Location):void => { 
            if (err) { 
              console.error('locationChanger: err=' + JSON.stringify(err)); 
            } 
            if (location) { 
              this.latitude =location.latitude 
              this.longitude =location.longitude 
              console.log('locationChanger: location=' + JSON.stringify(location)); 
              let markerOptions: mapCommon.MarkerOptions = { 
                position: { 
                  latitude: this.latitude, 
                  longitude: this.longitude 
                } 
              }; 
              // 新建一个默认的marker图标 
              this.mapController?.addMarker(markerOptions); 
              let target: mapCommon.LatLng = { 
                latitude:this.latitude, 
                longitude: this.longitude 
              }; 
              let cameraPosition: mapCommon.CameraPosition = { 
                target: target, 
                zoom: 10 
              }; 
              // 新建CameraUpdate对象 
              let cameraUpdate: map.CameraUpdate = map.newCameraPosition(cameraPosition); 
              // 移动相机 
              this.mapController.moveCamera(cameraUpdate); 
            } 
          }; 
          geoLocationManager.getCurrentLocation(requestInfo, locationChange); 
        }) 
      } 
    }.height('100%') 
 
  } 
}