先明確需求：應(yīng)用全局是豎屏的，個別頁面要支持橫屏，且這個橫屏是受控制中心的手機方向鎖定限制。

因為是要鎖定應(yīng)用豎屏，所以module.json5中要設(shè)置：

"orientation": "portrait",  // 固定屏幕方向

由于要在支持橫屏的頁面中用到mainwindow

let windowStage: window.WindowStage = AppStorage.get('windowStage') as window.WindowStage;

所以需要在你的 EntryAbility.ets文件中，先保存一個全局的windowStage:

  onWindowStageCreate(windowStage: window.WindowStage): void {
    // Main window is created, set main page for this ability
    AppStorage.setOrCreate("windowStage",windowStage) //保存windowStage
}

然后在需要要支持橫屏的頁面里實現(xiàn)如下方法：

aboutToAppear(): void {
  this.changeScreenOrientation(window.Orientation.AUTO_ROTATION_RESTRICTED);
}

aboutToDisappear(): void {
    this.changeScreenOrientation(window.Orientation.PORTRAIT);
}

changeScreenOrientation(orientation: window.Orientation) {
    let windowStage: window.WindowStage = AppStorage.get('windowStage') as window.WindowStage;
    let windowClass: window.Window;
    windowStage.getMainWindow((err, data) => {
      const errCode: number = err.code;
      if (errCode) {
        console.error(`Failed to obtain the main window. Cause code: ${err.code}, message: ${err.message}`);
        return;
      }
      windowClass = data;
      try {
        windowClass.setPreferredOrientation(orientation, (err) => {
        const errCode: number = err.code;
          if (errCode) {
            console.error(`Failed to set window orientation. Cause code: ${err.code}, message: ${err.message}`);
            return;
          }
          console.info('Succeeded in setting window orientation.');
        });
      } catch (exception) {
        console.error(`Failed to set window orientation. Cause code: ${exception.code}, message: ${exception.message}`);
      }
    });
}

解釋一下Orientation(https://developer.huawei.com/consumer/cn/doc/harmonyos-references/arkts-apis-window-e#orientation9)中幾個枚舉值的區(qū)別：

image.png

因此我們這里選擇了AUTO_ROTATION_RESTRICTED。如果設(shè)置AUTO_ROTATION,那么就會忽略手機控制中心里的手機方向鎖定鍵，頁面始終與手機物理方向保持一致。