InternalSington.txt

    void Awake(){
      AwakeSingleton();
    }
    #region Internal Singleton

    [Header("Internal Singleton:"), Tooltip("If True: this becomes a singleton.")]
    public bool SetDontDestroyOnLoad = true;
    public bool DebugMode = true;
    
    /// <summary>
    /// The instance of this script.
    /// </summary>
    public static MyScript Instance;

    /// <summary>
    /// In Case you wanted to call StartCoroutine in a static method
    /// </summary>
    public static MonoBehaviour monoBehaviour;
    
    public void AwakeSingleton()
    {
        // if the singleton hasn't been initialized yet
        if (Equals(SetDontDestroyOnLoad, true))
        {
            if (!Equals(Instance, null) && !Equals(Instance, this))
            {
                if (Instance.DebugMode)
                    Debug.LogError("Duplicate singleton " + this.gameObject + " created; destroying it now");
                Destroy(gameObject);
            }
            else {

                DontDestroyOnLoad(gameObject);
            }
        }
        else {
            Instance = this;
            monoBehaviour = GetComponent<MonoBehaviour>();
        }
        OnSetDebugMode = DebugMode;
    }

		public static bool OnSetDebugMode {
			set {
				PlayerPrefsManagerMain.SetString ("DebugMode", DebugMode.ToString ());
				DebugMode = value;
			}
		}
    
		public bool GetGebugMode{
      get{
        string message = PlayerPrefsManagerMain.GetString ("DebugMode";
        if(message == "true"){
          DebugMode = true;
        } else {
          DebugMode = false;
        }
      }
    }
#endregion