HarmonyOS LocalStorage使用

文韬_武略2024-06-06 18:27

官方关于LocalStorage的说明: https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V2/arkts-localstorage-0000001524537149-V2

说了些页面间，组建内关于LocalStorage的使用方法。这里就不再赘述。

但是关于如何在 UIAbility和 Page之间传递没有说。为啥我会这么问呢，因为我需要这么传：

javascript 复制代码

onWindowStageCreate(windowStage: window.WindowStage): void {
    windowStage.loadContent('pages/MainPage', localStorage);
  }

我需要把 UIAbility中的参数传递到第一个需要加载到页面中去，而且 windowStage.loadContent() 方法本来就可以传递一个 localStorage 的。

也就是如何将LocalStorage实例从UIAbility共享到一个或多个视图。

javascript 复制代码

export default class MainAbility extends UIAbility {

  localStorage = new LocalStorage();

  async onCreate(want: Want): Promise<void> {
    if (want?.uri != null && want.uri.length > 0) {
      let routePage = want.parameters?.['page'] as string;
      let routePageParam = want.parameters as Record<string, object>

      this.localStorage.clear()
      this.localStorage.setOrCreate('page', routePage)
      this.localStorage.setOrCreate('params', routePageParam)
    }
  }

  onWindowStageCreate(windowStage: window.WindowStage): void {
    windowStage.loadContent('pages/MainPage', this.localStorage);
  }
}

页面中:

javascript 复制代码

let storage = LocalStorage.getShared()
@Entry(storage)
@Component
struct MainPage {

  @State notificationState: string = ''
  private clickBackTimeRecord: number = 0;
  @LocalStorageProp('page') page: string = ''
  @LocalStorageProp('params') params: Record<string, object> = {}
}