HarmonyOS page透明化

可以尝试通过设置子窗口的方式，设置子窗口透明化

伪代码如下：

1、EntryAbility.ts

export default class EntryAbility extends UIAbility {
  ...

  onWindowStageCreate(windowStage: window.WindowStage): void {
    ...
    AppStorage.setOrCreate("windowStage",windowStage)//保存windowStage
    ...
  }

  ...
}

2、APage.ets

import window from '@ohos.window';

@Component
struct APage {

  build() {
    Row() {
      Column() {
        Button("pageA").onClick(() => {
          let windowStage_: window.WindowStage = AppStorage.get("windowStage") as window.WindowStage;
          windowStage_.createSubWindow("subWindow", (err, win) => {//创建透明子窗口并打开
            win.setUIContent('pages/BPage');
            win.showWindow();
          })
        })
      }
      .width('100%')
    }
    .height('100%')
    .backgroundColor(Color.Pink)

  }
}

3、BPage.ets

import window from '@ohos.window';

@Entry
@Component
struct BPage {
  @State message: string = 'BPage';

  aboutToAppear() {
    window.findWindow("hello").setWindowBackgroundColor("#00000000")//设置子窗口背景透明
  }

  onBackPress() {//关闭子窗口
    window.findWindow("subWindow").destroyWindow().then((res) => {
      console.log("destroyWindow success")
    }).catch(() => {
      console.log("destroyWindow fail")
    })
    return true
  }

  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
      }
      .width('100%')
    }
    .backgroundColor("#32ffffff")//组件背景，可以修改为#00000000透明
    .height('100%')
  }
}