Clean Unity Singleton Implementation. Inherit from Singleton<ExampleClass> to use it. Access the Singleton using ExampleClass.main

Singleton.cs

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

    public static T main
    {
        get
        {
            if (instance == null)
                instance = FindObjectOfType<T>();
            if (instance == null)
                Debug.Log($"No object of type {typeof(T).ToString()} found.");
            return instance;
        }
    }

    protected void OnEnable()
    {
        if (instance == null)
            instance = this as T;
        if (instance != this)
            DestroyMe();
    }

    void DestroyMe()
    {
        if (Application.isPlaying)
            Destroy(this);
        else
            DestroyImmediate(this);
    }
}