HarmonyOS 是否可以给ArkUI的toggle、switch这类绑定单向的变量？

@Entry  
@Component  
struct Index {  
  @State isDarkMode: boolean = false  
  build() {  
    Column() {  
      Column() {  
        Toggle({ type: ToggleType.Switch, isOn: $$this.isDarkMode })  
  
          .onChange((isOn: boolean) => {  
            console.info('Toggle.onChange:isOn' + isOn)  
            this.isDarkMode = isOn  
            getContext(this).getApplicationContext().setColorMode(this.isDarkMode ? 0 : 1)  
          })  
      }  
      .hitTestBehavior(HitTestMode.Block)  
      .onClick(() => {  
        setTimeout(() => {  
          this.isDarkMode = !this.isDarkMode  
        }, 10000)  
      })  
    }.width('100%').height('100%').padding(32)  
  }  
}