Unity 获取游戏UI根节点

Unity游戏开发过程中，经常需要获取Canvas来获取UI界面的根节点，方便实例化UI面板的位置，所以就自己总结了一个

 

using System;
using UnityEngine;

public class GameUtils : MonoBehaviour
{
    private GameObject uiRoot = null;

    private static GameUtils _instance;

    private void Awake()
    {
        DontDestroyOnLoad(gameObject);
    }

    public static GameUtils Instance()
    {
        if (_instance == null)
        {
            _instance = new GameUtils();
        }
        return _instance;
    }

    public GameObject UiRoot
    {
        get
        {
            return GetUIRoot();
        }
    }

    private GameObject GetUIRoot()
    {
        try
        {
            if (uiRoot != null)
            {
                return uiRoot;
            }
            if (FindObjectOfType<Canvas>() != null)
            {
                uiRoot = FindObjectOfType<Canvas>().gameObject;
                return uiRoot;
            }
            else
            {
                uiRoot = GameObject.Find("Canvas").gameObject;
                return uiRoot;
            }
        }
        catch (Exception e)
        {
            Debug.Log("获取根节点失败原因：" + e);
        }
        return null;
    }
}