SceneSingleton

Author: starryforest-ymxk

Assets/Scripts/SceneSingleton.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+// "Scene Singleton Pattern" or "Local Singleton Pattern"
+// It differs from the traditional "Global singleton pattern", 
+// The purpose of "Scene Singleton Pattern" is to ensure that there is only one instance of the class in a given scene, but it does not require that instance to persist across scenes. 
+// This pattern is useful when you need to manage certain assets or features in a single scene, but you don't want those assets or features to remain present when the scene is switched.
+
+public abstract class SceneSingleton<T> : MonoBehaviour where T : Component
+{
+
+    #region Fields
+
+    /// <summary>
+    /// The instance.
+    /// </summary>
+    private static T instance;
+
+    #endregion
+
+    #region Properties
+
+    /// <summary>
+    /// Gets the instance.
+    /// </summary>
+    /// <value>The instance.</value>
+    public static T Instance
+    {
+        get
+        {
+            if (instance == null)
+            {
+                instance = FindObjectOfType<T>();
+                if (instance == null)
+                {
+                    GameObject obj = new GameObject();
+                    obj.name = typeof(T).Name;
+                    instance = obj.AddComponent<T>();
+                }
+            }
+            return instance;
+        }
+    }
+
+    #endregion
+
+    #region Methods
+
+    /// <summary>
+    /// Use this for initialization.
+    /// </summary>
+    protected virtual void Awake()
+    {
+        if (instance == null)
+        {
+            instance = this as T;
+        }
+        else
+        {
+            Destroy(gameObject);
+        }
+    }
+
+    #endregion
+
+}