HarmonyOS 如何实现界面变亮变暗的效果？

Question

如题：HarmonyOS 如何实现界面变亮变暗的效果？

Answer 1

看一下grayscale和brightness，参考文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/ts-universal-attributes-image-effect-V5

提供一个demo，当点击test时 ，屏幕变暗：

import { wifiManager } from '@kit.ConnectivityKit';

@Entry
@Component
struct IPV6Page {
  @State message: string = 'Test';
  @State num: number = 1

  build() {
    RelativeContainer() {
      Text(this.message)
        .onClick(()=>{
          this.num = 0.3
        })
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        })
    }
    .height('100%')
    .width('100%')
    // .grayscale(0.5)
    .brightness(this.num)
  }
}