HarmonyOS 鸿蒙Next 有提供全局的loading加载框吗

//方式二：封装自定义组件
//【Index.ets】
import { LoadingPage } from './SecondPage'
import { promptAction } from '@kit.ArkUI';
let customDialogId: number = 0
@Entry
@Component
struct PageThree {
@State flag: boolean = false; // 控制是否加载
build() {
Column() {
Button(‘加载动画’).onClick((event: ClickEvent) => {
this.flag = !this.flag;
})
LoadingPage({ flag: this.flag });
}
.height(‘100%’)
.width(‘100%’)
.alignItems(HorizontalAlign.Start)
.justifyContent(FlexAlign.Start)
}
}
//【SecondPage.ets】
@Entry
@Component
export struct LoadingPage {
@Prop flag: boolean;
build() {
Row() {
LoadingProgress().color(Color.White).width(50).height(50)
}
.height(this.flag? ‘100%’ : 0)
.width(‘100%’)
.position({x: 0, y: 0})
.backgroundColor(’#4D000000’)
.justifyContent(FlexAlign.Center)
}
}