/C#/Unity/How to create a singleton in unity

How to create a singleton in unity

How to make a singleton in unity

 void Awake()
 {
   if (instance == null)
     instance = this;
   else if (instance != this)
     Destroy(gameObject);
 }

Source: studica.com

How to create a singleton in unity

public class SomeClass : MonoBehaviour {
    private static SomeClass _instance;

    public static SomeClass Instance { get { return _instance; } }


    private void Awake()
    {
        if (_instance != null && _instance != this)
        {
            Destroy(this.gameObject);
        } else {
            _instance = this;
          	DontDestroyOnLoad(gameObject);
        }
    }
}

Unity singleton

using System.Collections.Generic;
using System.Linq;
using UnityEngine;

public abstract class Singleton<T> : MonoBehaviour where T : Singleton<T>
{
    #region  Variables
    protected static bool Quitting { get; private set; }

    private static readonly object Lock = new object();
    private static Dictionary<System.Type, Singleton<T>> _instances;

    public static T Instance
    {
        get
        {
            if (Quitting)
            {
                return null;
            }
            lock (Lock)
            {
                if (_instances == null)
                    _instances = new Dictionary<System.Type, Singleton<T>>();

                if (_instances.ContainsKey(typeof(T)))
                    return (T)_instances[typeof(T)];
                else
                    return null;
            }
        }
    }

    #endregion

    #region  Methods
    private void OnEnable()
    {
        if (!Quitting)
        {
            bool iAmSingleton = false;

            lock (Lock)
            {
                if (_instances == null)
                    _instances = new Dictionary<System.Type, Singleton<T>>();

                if (_instances.ContainsKey(this.GetType()))
                    Destroy(this.gameObject);
                else
                {
                    iAmSingleton = true;

                    _instances.Add(this.GetType(), this);

                    DontDestroyOnLoad(gameObject);
                }
            }

            if(iAmSingleton)
                OnEnableCallback();
        }
    }

    private void OnApplicationQuit()
    {
        Quitting = true;

        OnApplicationQuitCallback();
    }

    protected abstract void OnApplicationQuitCallback();

    protected abstract void OnEnableCallback();
    #endregion
}

Source: gamedev.stackexchange.com

Similar codes

2 votes239 views1 answer
Unity mirror get ip address
C#Unity
0 vote224 views1 answer
How to update custom package in unity
C#Unity
0 vote298 views1 answer
Unity get prefabs from folder
C#Unity
30 votes280 views4 answers
Unity get all children
C#Unity
2 votes269 views1 answer
Unity c# class addition syntax
C#Unity
0 vote302 views1 answer
Unity script template folder
C#Unity
1 vote280 views1 answer
Slider.onchanged in unity
C#Unity
3 votes295 views2 answers
Unity pause scene
C#Unity
0 vote364 views1 answer
How to chnage the Scale propery of rect tranform unity
C#Unity
0 vote244 views1 answer
How to verify the scene unity
C#Unity