状态栏显隐变化

Stack() {
  ...
  Header({headOpacity: this.headOpacity, titleBackgroundColor: $r('app.color.ohos_id_color_background'), isTop: false});
  Header({headOpacity: this.opacityDefaultValue, titleBackgroundColor: $r('app.color.navigationbarchange_transparent_color'), isTop: true});
}

Scroll(this.scroller) {
  ...
}
.width($r('app.string.navigationbarchange_width_and_height_one_hundred_percent'))
.height($r('app.string.navigationbarchange_width_and_height_one_hundred_percent'))
.scrollable(ScrollDirection.Vertical)
.scrollBar(BarState.Off)
.edgeEffect(EdgeEffect.None)
.onScroll(() => {
  this.scrollOffset = this.scroller.currentOffset().yOffset;
  if(this.scrollOffset <= this.opacityComputeRadix) {
    this.headOpacity = this.scrollOffset / this.opacityComputeRadix;
  }
  else {
    this.headOpacity = this.opacityDefaultValue;
  }
})

navigationbarchange                                        // har类型
|---view
|   |---NavigationBarChange.ets                            // 视图层-状态栏显隐变化页面