HarmonyOS swiper如何滚动到任意页面？

import { promptAction } from '@kit.ArkUI';  
  
@Entry  
@Component  
struct SwiperPage {  
  
  @State swiperIndex:number = 0;  
  build() {  
    Column() {  
      //设置轮播图效果  
      Swiper() {  
      Row(){  
        Text('111').width('80%').height(100).backgroundColor(Color.Gray).textAlign(TextAlign.Center)  
      }  
      Row(){  
        Text('222').textAlign(TextAlign.Center).width('80%').height(100).backgroundColor(Color.Gray)  
      }  
        Row(){Text('333').textAlign(TextAlign.Center).width('80%').height(100).backgroundColor(Color.Gray)}  
        Row(){Text('444').textAlign(TextAlign.Center).width('80%').height(100).backgroundColor(Color.Gray)}  
  
  
      }  
      .indicator(  
        Indicator.dot()  
          .left(0)  
          .itemWidth(15)  
          .itemHeight(15)  
          .selectedItemWidth(30)  
          .selectedItemHeight(15)  
          .color(Color.Red)  
      ).onChange((index:number) => {  
        promptAction.showToast({message:`current index: ${index}`})  
        this.swiperIndex = index;  
      }).index(this.swiperIndex)  
  
      Button('跳转第四页').onClick(()=>{  
        this.swiperIndex = 3  
      })  
    }  
    .justifyContent(FlexAlign.Center)  
    .borderRadius(20)  
    .width('90%')  
    .height('70%')  
    .margin({ bottom: 10 })  
    .height('100%')  
    .width('100%')  
  }  
}