如何使用qml打开相机闪光灯或手电筒灯？

import QtMultimedia 5.12
import QtQuick.Controls 2.12

Camera {
    id: camera
}

Flashlight {
    id: flashlight
}

Switch {
    id: switchButton
    text: "开关"
    checked: false

    // 监听开关状态的改变
    onCheckedChanged: {
        // 如果开关被打开，则打开闪光灯或手电筒灯
        if (checked) {
            // 检查是否支持闪光灯
            if (camera.status === Camera.LoadedStatus && camera.availableFlashModes.contains(Camera.FlashOn)) {
                camera.flashMode = Camera.FlashOn;
                flashlight.enabled = true;
            }
        } else {
            // 关闭闪光灯或手电筒灯
            camera.flashMode = Camera.FlashOff;
            flashlight.enabled = false;
        }
    }
}