HarmonyOS 当前页面需要打开一个类似于模态的半屏蒙版，层级怎么设置

想要实现跳的时候和正常页面一样跳，返回后弹窗还在，且支持一下动态刷新自定义弹框的参数，可以通过Stack布局来模拟实现Dialog的效果，同时可通过状态变量动态刷新数据。参考代码如下：

// DialogFirst.ets
import { router } from '@kit.ArkUI';

@Entry
@Component
struct DialogFirst {
  @State textValue: string = '请阅读隐私协议'
  // 显隐控制设置为不占用
  @State visible: Visibility = Visibility.None

  onPageShow() {
    const params = router.getParams() as Record<string, string>; // 获取传递过来的参数对象
    if (params) {
      this.textValue = params.info as string; // 获取info属性的值
    }
  }

  build() {
    Stack() {
      // 初始页面
      Row() {
        Column() {
          Text('Hello World')
            .fontSize(50)
            .fontWeight(FontWeight.Bold)
          Button('click')
            .onClick(() => {
              console.log("hit me!")
              if (this.visible == Visibility.Visible) {
                this.visible = Visibility.None
              } else {
                this.visible = Visibility.Visible
              }
            })
            .backgroundColor(0x777474)
            .fontColor(0x000000)
        }
        .width('100%')
      }
      .height('100%')
      .backgroundColor(0x885555)

      //加了一个半透明灰色的蒙层效果
      Text('')
        .onClick(() => {
          if (this.visible == Visibility.Visible) {
            this.visible = Visibility.None
          } else {
            this.visible = Visibility.Visible
          }
        })
        .width('100%')
        .height('100%')
        .opacity(0.16)
        .backgroundColor(0x000000)
        .visibility(this.visible)
      Column() {
        Column() {
          Text('Change text').fontSize(20).margin({ top: 10, bottom: 10 })
          TextInput({ placeholder: '', text: this.textValue }).height(60).width('90%')
            .onChange((value: string) => {
              this.textValue = value
            })
          Text('Whether to change a text?').fontSize(16).margin({ bottom: 10 })
          Flex({ justifyContent: FlexAlign.SpaceAround }) {
            Button('cancel')
              .onClick(() => {
                if (this.visible == Visibility.Visible) {
                  this.visible = Visibility.None
                } else {
                  this.visible = Visibility.Visible
                }

              }).backgroundColor(0xffffff).fontColor(Color.Black)
            Button('jump')
              .onClick(() => {
                router.pushUrl({
                  url: 'pages/Index2'
                })
              }).backgroundColor(0xffffff).fontColor(Color.Red)
          }.margin({ bottom: 10 })
        }
        .backgroundColor(0xffffff)
        .visibility(this.visible)
        .clip(true)
        .borderRadius(20)
      }.width('95%') //设置弹窗宽度
    }
  }
}
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// Index2.ets
import { router } from '@kit.ArkUI';

@Entry
@Component
struct Index2 {
  @State message: string = '点击返回';

  build() {
    Column() {
      Button(this.message)
        .fontSize(50)
        .fontWeight(FontWeight.Bold).onClick(() => {
        router.back({
          url: 'dialog/DialogFirst',
          params: {
            info: '隐私已阅读'
          }
        });
      })
    }.width('100%').height('100%')
  }
}
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同时设置弹框autoCancel: false，可以做到点击遮障层弹框不退出。