开发者技术支持——HarmonyOS MapKit地图不显示

import { MapComponent, mapCommon, map } from '@kit.MapKit';
import { AsyncCallback } from '@kit.BasicServicesKit';


@Entry
@Component
struct HuaweiMapDemo {
  private TAG = "HuaweiMapDemo";
  private mapOptions?: mapCommon.MapOptions;
  private callback?: AsyncCallback<map.MapComponentController>;
  private mapController?: map.MapComponentController;
  private mapEventManager?: map.MapEventManager;


  aboutToAppear(): void {
    // 地图初始化参数，设置地图中心点坐标及层级
    this.mapOptions = {
      position: {
        target: {
          latitude: 39.9,
          longitude: 116.4
        },
        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;
        // 返回地图组件的监听事件管理接口
        this.mapEventManager = this.mapController.getEventManager();
        let callback = () => {
          console.info(this.TAG, `on-mapLoad`);
        }
        this.mapEventManager.on("mapLoad", callback);


        // 执行自定义的方法
        this.customizedMethod();
      }
    };
  }


  // 自定义的方法
  private customizedMethod() {
    // ...
  }


  build() {
    Stack() {
      // 调用MapComponent组件初始化地图
      MapComponent({ mapOptions: this.mapOptions, mapCallback: this.callback })
        .width('100%')
        .height('100%')
    }.height('100%')
  }
}