HarmonyOS 鸿蒙Next 修改标题栏背景色，返回按钮处的背景色无法修改

@Builder
getTitleBuilder(){
Row(){
Text(“选择货车ETC”).fontColor($r(‘app.color.font_color_white’))
}
.width(“100%”)
.height(“100%”)
.backgroundColor($r(‘app.color.theme_color’))
.justifyContent(FlexAlign.Center)
.alignItems(VerticalAlign.Center)
}

build() {
NavDestination() {
}
.title(this.getTitleBuilder)
.onShown(this.onShown)
.onReady((context: NavDestinationContext) => {
this.pathStack = context.pathStack
})
.onBackPressed(() => {
if(this.pathStack.size() == 1){
router.back()
return true
}
return false
})
}