arkts怎么打开摄像头拍照界面，拍照后返回图片?

import abilityAccessCtrl from '@ohos.abilityAccessCtrl'  
async takePhoto() {
    await abilityAccessCtrl.createAtManager().requestPermissionsFromUser(getContext(this), ['ohos.permission.CAMERA', 'ohos.permission.READ_MEDIA'])
    let context = getContext(this) as common.UIAbilityContext
    let result = await context.startAbilityForResult({ action: "ohos.want.action.imageCapture" })
    return result.want.uri // 照片uri
  }
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