HarmonyOS 是否有防录屏的功能

一些页面需要实现防截屏功能。首先需要在module.json5中申请隐私窗口权限。 然后在onPageShow()中获取当前窗口对象并设置隐私模式。 在退出页面的时候，在onPageHide()生命周期中取消隐私模式即可，参考文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-window-V5#setwindowprivacymode9

示例如下：

//module.json5文件中
{
  "name": 'ohos.permission.PRIVACY_WINDOW'
}
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//EAbility文件中
onWindowStageCreate(windowStage: window.WindowStage): void {
  let windowClass: window.Window = windowStage.getMainWindowSync(); // 获取应用主窗口
  AppStorage.setOrCreate("windowClass", windowClass);
}
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//Index文件中
import { window } from '@kit.ArkUI';
import { BusinessError } from '@ohos.base';

@Entry
@Component
struct Index43 {
  private windowStage = AppStorage.get("windowStage") as window.WindowStage
  private windowClass = AppStorage.get("windowClass") as window.Window
  @State message: string = 'Hello World';

  build() {
    Row() {
      Column() {
        Text('禁止截屏').fontSize(50).fontWeight(FontWeight.Bold).onClick(() => {
          let isPrivacyMode: boolean = true;
          try {
            this.windowClass.setWindowPrivacyMode(isPrivacyMode, (err: BusinessError) => {
              const errCode: number = err.code;
              if (errCode) {
                console.error('Failed to set the window to privacy mode. Cause:' + JSON.stringify(err));
                return;
              }
              console.info('Succeeded in setting the window to privacy mode.');
            });
          } catch (exception) {
            console.error('Failed to set the window to privacy mode. Cause:' + JSON.stringify(exception));
          }
        })
        Text('允许截屏').fontSize(50).fontWeight(FontWeight.Bold).onClick(() => {
          let isPrivacyMode: boolean = false;
          try {
            this.windowClass.setWindowPrivacyMode(isPrivacyMode, (err: BusinessError) => {
              const errCode: number = err.code;
              if (errCode) {
                console.error('Failed to set the window to privacy mode. Cause:' + JSON.stringify(err));
                return;
              }
              console.info('Succeeded in setting the window to privacy mode.');
            });
          } catch (exception) {
            console.error('Failed to set the window to privacy mode. Cause:' + JSON.stringify(exception));
          }
        })
      }.width('100%')
    }.height('100%')
  }
}
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