HarmonyOS @ohos.promptAction可以更改背景色吗？

toast组件目前不支持自定义，可以使用自定义弹窗来实现,请参考代码：

若要取消蒙层，请将maskColor设置为Color.Transparent;若需要想toast那样定时取消，可以将isModel设置为false,然后通过setTimeOut来设置定时显示，offset可控制显示位置。

@CustomDialog
struct CustomDialogExampleTwo {
  controllerTwo?: CustomDialogController
  build() {
    Column() {
      Text('我是第二个弹窗')
        .fontSize(30)
        .height(100)
      Button('点我关闭第二个弹窗')
        .onClick(() => {
          if (this.controllerTwo != undefined) {
            this.controllerTwo.close()
          }
        })
        .margin(20)
    }
  }
}
@CustomDialog
struct CustomDialogExample {
  @Link textValue: string
  @Link inputValue: string
  dialogControllerTwo: CustomDialogController | null = new CustomDialogController({
    builder: CustomDialogExampleTwo(),
    alignment: DialogAlignment.Bottom,
    offset: { dx: 0, dy: -325 } })
  controller?: CustomDialogController
  // 若尝试在CustomDialog中传入多个其他的Controller，以实现在CustomDialog中打开另一个或另一些CustomDialog，那么此处需要将指向自己的controller放在所有controller的后面
  cancel: () => void = () => {
  }
  confirm: () => void = () => {
  }

  build() {
    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.controller != undefined) {
              this.controller.close()
              this.cancel()
            }
          }).backgroundColor(0xffffff).fontColor(Color.Black)
        Button('confirm')
          .onClick(() => {
            if (this.controller != undefined) {
              this.inputValue = this.textValue
              this.controller.close()
              this.confirm()
            }
          }).backgroundColor(0xffffff).fontColor(Color.Red)
      }.margin({ bottom: 10 })

      Button('点我打开第二个弹窗')
        .onClick(() => {
          if (this.dialogControllerTwo != null) {
            this.dialogControllerTwo.open()
          }
        })
        .margin(20)
    }.borderRadius(10)
    // 如果需要使用border属性或cornerRadius属性，请和borderRadius属性一起使用。
  }
}
@Entry
@Component
struct CustomDialogUser {
  @State textValue: string = ''
  @State inputValue: string = 'click me'
  dialogController: CustomDialogController | null = new CustomDialogController({
    builder: CustomDialogExample({
      cancel: ()=> { this.onCancel() },
      confirm: ()=> { this.onAccept() },
      textValue: $textValue,
      inputValue: $inputValue
    }),
    cancel: this.exitApp,
    autoCancel: true,
    alignment: DialogAlignment.Bottom,
    offset: { dx: 0, dy: -20 },
    gridCount: 4,
    customStyle: false,
    cornerRadius: 10,
  })

  // 在自定义组件即将析构销毁时将dialogControlle置空
  aboutToDisappear() {
    this.dialogController = null // 将dialogController置空
  }

  onCancel() {
    console.info('Callback when the first button is clicked')
  }

  onAccept() {
    console.info('Callback when the second button is clicked')
  }

  exitApp() {
    console.info('Click the callback in the blank area')
  }
  build() {
    Column() {
      Button(this.inputValue)
        .onClick(() => {
          if (this.dialogController != null) {
            this.dialogController.open()
          }
        }).backgroundColor(0x317aff)
    }.width('100%').margin({ top: 5 })
  }
}