HarmonyOS 组件设置属性无效果

.expandSafeArea([SafeAreaType.SYSTEM], [SafeAreaEdge.TOP, SafeAreaEdge.BOTTOM])

// Index.ets  
@Entry  
@Component  
struct Index {  
  @State message: string = 'Hello World'  
  private controller: TabsController = new TabsController()  
  @State selfFadingFade: boolean = true;  
  @State currentIndex: number = 0  
  @State isTrue: boolean = false;  
  build() {  
    Column() {  
      Image($r("app.media.ic_app_background"))  
        .height('100%').width('100%')  
        .expandSafeArea(this.isTrue ? [] : [SafeAreaType.SYSTEM],  
          this.isTrue ? [] : [SafeAreaEdge.TOP, SafeAreaEdge.BOTTOM]) // 图片组件的绘制区域扩展至状态栏和导航条。  
        Button("切换").onClick(() => {  
        this.isTrue = !this.isTrue  
      })  
  
    }  
  }  
}