书写一段unity在VR中的UI设计代码

以下是一个简单的Unity VR UI设计代码示例：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class VRUI : MonoBehaviour
{
    public GameObject uiCanvas;
    public Text infoText;
    public RectTransform reticle;

    private bool isGazeOver = false;

    // Update is called once per frame
    void Update()
    {
        // Set the position of the reticle to the center of the screen
        reticle.position = new Vector3(Screen.width / 2f, Screen.height / 2f, 0f);

        // Check if the user is looking at the UI element
        Ray ray = Camera.main.ViewportPointToRay(new Vector3(0.5f, 0.5f, 0f));
        RaycastHit hit;
        if (Physics.Raycast(ray, out hit))
        {
            if (hit.collider.gameObject == uiCanvas)
            {
                isGazeOver = true;
            }
            else
            {
                isGazeOver = false;
            }
        }
        else
        {
            isGazeOver = false;
        }

        // If the user is looking at the UI element, display a message
        if (isGazeOver)
        {
            infoText.text = "Hello World!";
        }
        else
        {
            infoText.text = "";
        }
    }
}

这个示例代码创建了一个简单的UI Canvas，其中包含一个文本框和一个指示器。该脚本检查用户是否正在查看UI元素，并在用户查看时显示一条消息。要使此代码工作，您需要将其附加到具有UI Canvas的游戏对象上。