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Src/Core/StateMachine/IStateMachine.cs

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+using System;
+using System.Collections.Generic;
+using Cysharp.Threading.Tasks;
+
+namespace BITKit.StateMachine
+{
+    public struct EmptyState:IState
+    {
+        public bool Enabled { get; set; }
+        public void Initialize()
+        {
+        }
+
+        public void OnStateEntry(IState old)
+        {
+        }
+
+        public void OnStateUpdate(float deltaTime)
+        {
+        }
+
+        public void OnStateExit(IState old, IState newState)
+        {
+        }
+    }
+    public interface IState
+    {
+        bool Enabled { get; set; }
+        void Initialize();
+        void OnStateEntry(IState old);
+        void OnStateUpdate(float deltaTime);
+        void OnStateExit(IState old, IState newState);
+    }
+
+    public interface IStateAsync:IState
+    {
+        /// <summary>
+        /// 识别符,用于识别多个相同状态但不同用途的状态机
+        /// </summary>
+        int Identifier { get; set; }
+        UniTask InitializeAsync();
+        UniTask OnStateEntryAsync(IState old);
+        UniTask OnStateUpdateAsync(float deltaTime);
+        UniTask OnStateExitAsync(IState old, IState newState);
+    }
+
+    public interface IStateMachine<T> where T:IState
+    {
+        bool Enabled { get; set; }
+        T CurrentState { get; set; }
+        event Action<T,T> OnStateChanged;
+        event Action<T> OnStateRegistered;
+        event Action<T> OnStateUnRegistered;
+       
+        IDictionary<Type, T> StateDictionary { get; }
+        void Initialize();
+        void UpdateState(float deltaTime);
+        void DisposeState();
+        void TransitionState<State>() where State : T;
+        void TransitionState(T state);
+        void Register(T newState) => throw new NotImplementedException("未实现的接口");
+        void UnRegister(T newState) => throw new NotImplementedException("未实现的接口");
+        void InvokeOnStateRegistered(T state){}
+        void InvokeOnStateUnRegistered(T state){}
+    }
+    public static class StateMachineUtils
+    {
+        public static void Register<T>(this IStateMachine<T> stateMachine, T newState) where T : IState
+        {
+            if (stateMachine.StateDictionary.ContainsKey(newState.GetType()))
+            {
+                throw new ArgumentException($"State {newState.GetType().Name} already registered");
+            }
+            stateMachine.StateDictionary.Add(newState.GetType(), newState);
+            newState.Initialize();
+            stateMachine.InvokeOnStateRegistered(newState);
+        }
+        public static void UnRegister<T>(this IStateMachine<T> stateMachine, T newState) where T : IState
+        {
+            if (!stateMachine.StateDictionary.ContainsKey(newState.GetType())) return;
+            stateMachine.StateDictionary.Remove(newState.GetType());
+            stateMachine.InvokeOnStateUnRegistered(newState);
+        }
+    }
+}