#jitoa#【OpenHarmony 北向应用开发】Arkts服务卡片数据每秒刷新的实现? 原创

let storage = new LocalStorage();
@Entry(storage)
@Component
struct WidgetCard {
  @LocalStorageProp("message") message: string = "hello world";
  ...
}
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// 使用方创建卡片时触发，提供方需要返回卡片数据绑定类
onAddForm(want) {
    // 在入参want中可以取出卡片的唯一标识：formId
    let formId: string = want.parameters[formInfo.FormParam.IDENTITY_KEY];
    // 在这里存储formId
    	...
    let obj = {"message": "hello world"};
    let formData = formBindingData.createFormBindingData(obj);
    return formData;
  }
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@State message: string = "hello";
  private intervalId: number = 0;
  aboutToAppear(){
    // 设置定时函数，执行间隔为1000ms
    this.intervalId = setInterval(()=>{
        // 从数据库中拿到存储的formId
        let formId: string = ...
        // 要更新给卡片的数据
        let obj = {"message": this.message};
        let formInfo = formBindingData.createFormBindingData(obj)
        formProvider.updateForm(formId, formInfo);
    }, 1000)
  }
  aboutToDisappear(){
    clearInterval(this.intervalId)
  }
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import formBindingData from '@ohos.app.form.formBindingData';
import formProvider from '@ohos.app.form.formProvider';
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