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unity/Assets/Script/Tools/Utils/MonoSingleton.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public abstract class MonoSingleton<T> : MonoBehaviour where T : MonoBehaviour
+{
+    public bool global=true;
+    private static T instance;
+    public static T Instance
+    {
+        get
+        {
+            if (instance == null)
+                instance = FindObjectOfType<T>();
+            return instance;
+        }
+    }
+    void Awake()
+    {
+        if (global)
+        {
+            if (instance != null && instance != this.gameObject.GetComponent<T>())
+            {
+                Destroy(this.gameObject);
+                return;
+            }
+            DontDestroyOnLoad(this.gameObject);
+            instance = this.gameObject.GetComponent<T>();
+
+        }
+        this.OnStart();
+    }
+
+    protected virtual void OnStart()
+    {
+
+    }
+}