一、简介

最近在各大网站看了一下 Unity3d 的 UI 框架，各种 UI 框架已经有很多的版本了，各有千秋，有的功能虽然写的完善，但用起来太复杂，有的框架功能不完善，搞个课程就上架了，还有什么 MVC 框架，绕来绕去的看的头都大了，这些根本不想用。

于是我自己就写了一个 UI 框架，只有两个脚本，不用向 UI 预制体上挂载脚本，所有的组件访问都可以通过 UIManager 来控制，常用的几个方法：显示界面，关闭界面，查找子物体，就这么多。

二、UI 框架

下面的两个脚本是 UI 框架的核心部分，具体的用法在下面的章节有介绍

UIBase

using UnityEngine;public class UIBase
{#region 字段/// <summary>/// Prefabs路径/// </summary>public string PrefabsPath { get; set; }/// <summary>/// UI面板的名字/// </summary>public string UIName { get; set; }/// <summary>/// 当前UI所在的场景名/// </summary>public string SceneName { get; set; }/// <summary>/// Type 的全名/// </summary>public string FullName { get; set; }/// <summary>/// 当前UI的游戏物体/// </summary>public GameObject UIGameObject { get; set; }#endregion/// <summary>/// 面板实例化时执行一次/// </summary>public virtual void Start() { }/// <summary>/// 每帧执行/// </summary>public virtual void Update() { }/// <summary>/// 当前UI面板销毁之前执行一次/// </summary>public virtual void Destroy() { }/// <summary>/// 根据名称查找一个子对象/// </summary>/// <param name="name"></param>/// <returns></returns>public GameObject GetObject(string name){Transform[] trans = UIGameObject.GetComponentsInChildren<Transform>();foreach (var item in trans){if (item.name == name)return item.gameObject;}Debug.LogError(string.Format("找不到名为 {0} 的子对象", name));return null;}/// <summary>/// 根据名称获取一个子对象的组件/// </summary>/// <typeparam name="T"></typeparam>/// <param name="name"></param>/// <returns></returns>public T GetOrAddCommonent<T>(string name) where T : Component{GameObject child = GetObject(name);if (child){if (child.GetComponent<T>() == null)child.AddComponent<T>();return child.GetComponent<T>();}return null;}protected UIBase() { }
}

UIManager

using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;public class UIManager : MonoBehaviour
{public static UIManager Instance;//存储场景中的UI信息private Dictionary<string, UIBase> UIDic = new Dictionary<string, UIBase>();//当前场景的 Canvas 游戏物体private Transform CanvasTransform = null;//当前字典中UI的个数public int UICount{get { return UIDic.Count; }}private void Awake(){Instance = this;}private void Start(){}private void Update(){if (UIDic.Count > 0){foreach (var key in UIDic.Keys){if (UIDic[key] != null)UIDic[key].Update();}}}/// <summary>/// 显示面板/// </summary>/// <typeparam name="T"></typeparam>/// <returns></returns>public UIBase ShowUI<T>() where T : UIBase{Type t = typeof(T);string fullName = t.FullName;if (UIDic.ContainsKey(fullName)){Debug.Log("当前面板已经显示了，名字：" + fullName);return UIDic[fullName];}GameObject canvasObj = GameObject.Find("Canvas");if (canvasObj == null){Debug.LogError("场景中没有Canvas组件，无法显示UI物体");return null;}CanvasTransform = canvasObj.transform;UIBase uiBase = Activator.CreateInstance(t) as UIBase;if (string.IsNullOrEmpty(uiBase.PrefabsPath)){Debug.LogError("Prefabs 路径不能为空");return null;}GameObject prefabs = Resources.Load<GameObject>(uiBase.PrefabsPath);GameObject uiGameOjbect = GameObject.Instantiate(prefabs, CanvasTransform);uiGameOjbect.name = uiBase.PrefabsPath.Substring(uiBase.PrefabsPath.LastIndexOf('/') + 1);uiBase.UIName = uiGameOjbect.name;uiBase.SceneName = SceneManager.GetActiveScene().name;uiBase.UIGameObject = uiGameOjbect;uiBase.FullName = fullName;uiBase.Start();UIDic.Add(fullName, uiBase);return uiBase;}/// <summary>/// 移除面板/// </summary>/// <typeparam name="T"></typeparam>public void RemoveUI<T>(){Type t = typeof(T);string fullName = t.FullName;if (UIDic.ContainsKey(fullName)){UIBase uIBase = UIDic[fullName];uIBase.Destroy();GameObject.Destroy(uIBase.UIGameObject);UIDic.Remove(fullName);return;}Debug.Log(string.Format("当前的UI物体未实例化，名字：{0}", fullName));}/// <summary>/// 清除所有的UI物体/// </summary>public void ClearAllPanel(){foreach (var key in UIDic.Keys){UIBase uIBase = UIDic[key];if (uIBase != null){uIBase.Destroy();GameObject.Destroy(uIBase.UIGameObject);}}UIDic.Clear();}/// <summary>/// 找到指定的UI面板/// </summary>/// <typeparam name="T"></typeparam>/// <param name="name"></param>/// <returns></returns>public GameObject GetGameObject<T>(string name){Type t = typeof(T);string fullName = t.FullName;UIBase uIBase = null;if (!UIDic.TryGetValue(fullName, out uIBase)){Debug.Log("没有找到对应的UI面板，名字：" + fullName);return null;}return uIBase.GetObject(name);}private UIManager() { }
}

三、UI 框架的用法

我用了两个 场景来测试框架，start 和 main 场景

start 场景如下：

在 Start 场景 GameRoot 上挂上 StartSceneRoot 脚本

这个脚本就调用框架在场景中显示一个UI

using UnityEngine;public class StartSceneRoot : MonoBehaviour {	void Start () {UIManager.Instance.ShowUI<Panel_MainUI>();}
}

在 GameManager 游戏物体上有两个脚本，这个是要跟随着场景一起跳转的。

UIManager 的代码在上一节，下面是 GameManager 代码 

using UnityEngine;
using UnityEngine.SceneManagement;public class GameManager : MonoBehaviour {public static GameManager Instance;private static bool origional = true;private void Awake(){if (origional){Instance = this as GameManager;origional = false;DontDestroyOnLoad(this.gameObject);}else{Destroy(this.gameObject);}}void Start () {SceneManager.sceneUnloaded += SceneManager_sceneUnloaded;SceneManager.sceneLoaded += SceneManager_sceneLoaded;}private void SceneManager_sceneLoaded(Scene arg0, LoadSceneMode arg1){//Debug.Log("场景加载了，场景名：" + arg0.name);}private void SceneManager_sceneUnloaded(Scene arg0){//Debug.Log("场景卸载了，场景名：" + arg0.name);//注意：切换场景要清除掉 UIManager 中保存的 UI 数据UIManager.Instance.ClearAllPanel();}public void LoadScene(string sceneName){if (SceneManager.GetActiveScene().name != sceneName){SceneManager.LoadScene(sceneName);}}private GameManager() { }
}

在 start 场景中挂载到游戏物体上的脚本就这三个：StartSceneRoot，GameManager，UIManager

下面就准备要显示的 UI 了，在这里，我做了三个 UI 界面，并做成预制体

界面 Panel_MainUI

界面 Panel_Setting

界面 Panel_Affiche

这三个预制体对应的也是三个脚本，但不用挂在游戏物体上，作用是UI的逻辑部分。

Panel_MainUI

using UnityEngine;
using UnityEngine.UI;public class Panel_MainUI : UIBase
{public Panel_MainUI(){PrefabsPath = "Prefabs/UI/Panel_MainUI";}public override void Start(){GetOrAddCommonent<Button>("Button_Setting").onClick.AddListener(() =>{//显示设置面板UIManager.Instance.ShowUI<Panel_Setting>();});GetOrAddCommonent<Button>("Button_Task").onClick.AddListener(() =>{//清除所有的面板//UIManager.Instance.ClearAllPanel();  //跳转到 main 场景GameManager.Instance.LoadScene("main");});GetOrAddCommonent<Button>("Button_Equipage").onClick.AddListener(() =>{Debug.Log("UIManager 中 UI 面板的个数：" + UIManager.Instance.UICount);});}public override void Update(){//Debug.Log("我是 Panel_MainUI Update 方法");}public override void Destroy(){//Debug.Log("我是 Panel_MainUI Destroy 方法");}
}

Panel_Setting

using UnityEngine;
using UnityEngine.UI;public class Panel_Setting : UIBase
{public Panel_Setting(){PrefabsPath = "Prefabs/UI/Panel_Setting";}public override void Start(){//Debug.Log("我是 Panel_Setting Start 方法");GetOrAddCommonent<Button>("Button_Close").onClick.AddListener(() =>{//移除自己UIManager.Instance.RemoveUI<Panel_Setting>();});GetOrAddCommonent<Button>("Button_Test").onClick.AddListener(() =>{//访问其他的面板的游戏物体 GameObject obj = UIManager.Instance.GetGameObject<Panel_MainUI>("Button_Map");if (obj != null)obj.transform.Find("Text").GetComponent<Text>().text = "Map";});GetOrAddCommonent<Button>("Button_Test1").onClick.AddListener(() =>{Debug.Log("UIManager 中 UI 面板的个数：" + UIManager.Instance.UICount);});}public override void Update(){//Debug.Log("我是 Panel_Setting Update 方法");}public override void Destroy(){//Debug.Log("我是 Panel_Setting Destroy 方法");}
}

Panel_Affiche

using UnityEngine;
using UnityEngine.UI;public class Panel_Affiche : UIBase
{public Panel_Affiche(){PrefabsPath = "Prefabs/UI/Panel_Affiche";}public override void Start(){GetOrAddCommonent<Button>("Button_Close").onClick.AddListener(() =>{GameManager.Instance.LoadScene("start");});}public override void Update(){//Debug.Log("我是 Panel_Affiche Update 方法");}public override void Destroy(){//Debug.Log("我是 Panel_Affiche Destroy 方法");}
}

main 场景只挂了一个脚本

MainSceneRoot 脚本同样也是只是用来显示UI用的

using UnityEngine;public class MainSceneRoot : MonoBehaviour {void Start () {UIManager.Instance.ShowUI<Panel_Affiche>();}
}

运行后就能看到，显示了 Panel_MainUI 的UI界面，点击设置，就会打开设置的界面，点击任务按钮，就会跳转到 main 场景（这里只是测试）

跳转到 main 场景后，点击关闭按钮，又会返回到 start 场景。

演示就这些了，写这个框架我也就用了几个小时而已，当然还有待继续完善和改进的，另外，我用的 Unity版本是 Unity 5.6.7f1 ，C# 的一些高级语法用不了，不然可以写的更优雅一些。

源码：点击跳转

结束

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