Singleton

using System.ComponentModel;
using UnityEngine;
using System.Collections;

public class Singleton<T> : MonoBehaviour where T : MonoBehaviour
{
    private static T _instance;

    public static T Instance
    {
        get
        {
            if (_instance == null)
            {
                _instance = (T)FindObjectOfType(typeof(T));
                if (_instance == null)
                {
                    var singleton = new GameObject();
                    _instance = singleton.AddComponent<T>();
                    singleton.name =  typeof(T).ToString();
                  ;
                }
            }
            return _instance;
        }
    }
}