Singleton

Assets/EventManager.meta

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Assets/EventManager/Scripts/CommonEvents.cs

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+public class CommonEventBase
+{
+    private int _errorCode;
+    public int ErrorCode
+    {
+        get { return _errorCode; }
+        set { _errorCode = value; }
+    }
+}
+
+public class CustomEvent : CommonEventBase
+{
+
+}

Assets/EventManager/Scripts/CommonEvents.cs.meta

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Assets/EventManager/Scripts/EventManager.cs

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+using FirstVillain.Singleton;
+using System;
+using System.Collections.Generic;
+
+namespace FirstVillain.Event
+{
+    public class EventManager : UnitySingleton<EventManager>
+    {
+        public delegate void EventDelegate<T>(T cEvent) where T : CommonEventBase;
+        private delegate void EventDelegate(CommonEventBase cEvent);
+
+        private Dictionary<Type, EventDelegate> _delegateDict = new();
+        private Dictionary<Delegate, EventDelegate> _delegateLookupDict = new();
+
+        private void AddListener<T>(EventDelegate<T> callback) where T : CommonEventBase
+        {
+            EventDelegate newDelegate = e => callback(e as T);
+            _delegateLookupDict[callback] = newDelegate;
+
+            var type = typeof(T);
+            if (!_delegateDict.TryGetValue(type, out EventDelegate tempDeletage))
+            {
+                _delegateDict[type] = tempDeletage;
+            }
+
+            _delegateDict[type] += newDelegate;
+        }
+
+        public void DelListener<T>(EventDelegate<T> callback) where T : CommonEventBase
+        {
+            if (_delegateLookupDict.TryGetValue(callback, out EventDelegate targetDelegate))
+            {
+                var type = typeof(T);
+                if (_delegateDict.TryGetValue(type, out EventDelegate tempDelegate))
+                {
+                    tempDelegate -= targetDelegate;
+                    if (tempDelegate == null)
+                    {
+                        _delegateDict.Remove(type);
+                        _delegateLookupDict.Remove(callback);
+                    }
+                    else
+                    {
+                        _delegateDict[type] = tempDelegate;
+                    }
+                }
+            }
+        }
+
+        public static void ExecuteEvent(CommonEventBase cEvent)
+        {
+            if (Instance._delegateDict.TryGetValue(cEvent.GetType(), out EventDelegate callback))
+            {
+                callback.Invoke(cEvent);
+            }
+        }
+
+        public void Clear()
+        {
+            _delegateDict.Clear();
+            _delegateLookupDict.Clear();
+        }
+    }
+}
+

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Assets/Singleton.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()
+        { }
+    }
+}

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