HarmonyOS 创建全局弹窗的推荐方案

全局自定义弹窗可参考：https://gitee.com/harmonyos-cases/cases/blob/master/CommonAppDevelopment/feature/customdialog/README.md；

问题二可参考以下demo：

import router from '@ohos.router';

@CustomDialog
export default struct UserPrivacyDialog {
  controller: CustomDialogController = new CustomDialogController({ builder: '' });
  cancel: Function = () => {
  };
  confirm: Function = () => {
  };
  visible: Visibility = Visibility.None
  build() {
    Column() {
      Text('我是弹窗')
      Button('jump').onClick(() => {
        router.pushUrl({ url: 'pages/Index' })
      }).backgroundColor(0xffffff).fontColor(Color.Red)
    }.margin({ top: 22 }).justifyContent(FlexAlign.SpaceEvenly)
  }
}

@Entry
@Component
struct Index {
  @State textValue: string = 'Hello World'
  @State visible: Visibility = Visibility.None
  build() {
    Stack() {
      Row() {
        Column() {
          Button('click').onClick(() => {
            if (this.visible == Visibility.Visible) {
              this.visible = Visibility.None
            } else {
              this.visible = Visibility.Visible
            }
          }).backgroundColor(0x777474).fontColor(0x000000)
        }.width('100%')
      }.height('100%').backgroundColor(0x885555)

      Text('')
        .onClick(() => {
          if (this.visible == Visibility.Visible) {
            this.visible = Visibility.None
          } else {
            this.visible = Visibility.Visible
          }
        })
        .width('100%')
        .height('100%')
        .opacity(0.16)// 透明度可以自己调节一下
        .backgroundColor(0x000000)
        .visibility(this.visible)
      Column() {
        GridRow({
          columns: {
            xs: 1,
            sm: 4,
            md: 8,
            lg: 12
          },
          breakpoints: { value: ["400vp", "600vp", "800vp"], reference: BreakpointsReference.WindowSize },
        }) {
          GridCol({
            span: {
              xs: 1,
              sm: 2,
              md: 4,
              lg: 8
            },
            offset: {
              xs: 0,
              sm: 1,
              md: 2,
              lg: 2
            }
          }) {
            Column() {
              Flex({ justifyContent: FlexAlign.SpaceAround }) {
                UserPrivacyDialog();
              }.margin({ bottom: 10 })
            }.backgroundColor(0xffffff).visibility(this.visible).clip(true).borderRadius(20)
          }
        }
      }.width('95%') //设置弹窗宽度
    }
  }
}