ZhenShiXunYouJi2/Assets/Scripts/ThereCanBeOnlyOne.cs

using System;
using UnityEngine;

public class ThereCanBeOnlyOne : MonoBehaviour
{
	private void Awake()
	{
		if (this.Prefab != null)
		{
			if (!GameObject.Find(this.Prefab.name))
			{
				GameObject gameObject = UnityEngine.Object.Instantiate<GameObject>(this.Prefab);
				gameObject.name = this.Prefab.name;
			}
		}
		else
		{
			UnityEngine.Debug.LogError("Error prefab not set so There Can't Be Only One", this);
		}
	}

	private void Start()
	{
	}

	public GameObject Prefab;
}