Singleton

Assets/Singleton.meta

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Assets/Singleton/Scripts.meta

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Assets/Singleton/Scripts/UnitySingleton.cs

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+using UnityEngine;
+
+namespace FirstVillain.Singleton
+{
+    public class UnitySingleton<T> : MonoBehaviour where T : UnityEngine.Component
+    {
+        private static T _instance = null;
+
+        public static T Instance
+        {
+            get
+            {
+                if (_instance == null)
+                {
+                    string name = (typeof(T)).ToString();
+                    _instance = new GameObject(name).AddComponent<T>();
+                }
+
+                return _instance;
+            }
+        }
+        private void Awake()
+        {
+            if (_instance != null && _instance != this)
+            {
+                Destroy(gameObject);
+                return;
+            }
+            else
+            {
+                _instance = this as T;
+            }
+
+            DontDestroyOnLoad(gameObject);
+
+            AwakeSingleton();
+        }
+
+        private void OnDestroy()
+        {
+            if (_instance == this)
+            {
+                _instance = null;
+            }
+        }
+
+        protected virtual void AwakeSingleton()
+        { }
+    }
+    public class UnitySingletonOnce<T> : MonoBehaviour where T : UnityEngine.Component
+    {
+        private static T _instance = null;
+
+        public static T Instance
+        {
+            get
+            {
+                if (_instance == null)
+                {
+                    string name = (typeof(T)).ToString();
+                    _instance = new GameObject(name).AddComponent<T>();
+                }
+
+                return _instance;
+            }
+        }
+        private void Awake()
+        {
+            if (_instance != null && _instance != this)
+            {
+                Destroy(gameObject);
+                return;
+            }
+            else
+            {
+                _instance = this as T;
+            }
+
+            AwakeSingleton();
+        }
+
+        private void OnDestroy()
+        {
+            if (_instance == this)
+            {
+                _instance = null;
+            }
+        }
+
+        protected virtual void AwakeSingleton()
+        { }
+    }
+}

Assets/Singleton/Scripts/UnitySingleton.cs.meta

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