Unity用シングルトン

SampleInstance.cs

using UnityEngine;

public class SampleInstance : SingletonMonoBehaviour<SampleInstance>
{
}

SingletonMonoBehaviour.cs

public class SingletonMonoBehaviour<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) {
					Debug.LogError (typeof(T) + "is nothing");
				}
			}
 
			return instance;
		}
	}
	
	protected void Awake()
	{
		CheckInstance();
	}
	
	protected bool CheckInstance()
	{
		if( this == Instance){ return true;}
		Destroy(this);
		return false;
	}
}