Unity5的关卡切换

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本文章由cartzhang编写，转载请注明出处。所有权利保留。
文章链接：http://blog.csdn.net/cartzhang/article/details/51055584
作者：cartzhang

一、Unity关卡

Unity 使用过程中关卡加载和卸载是大多数三维引擎都要提供的基本功能。
因为关卡切换在游戏中非常常用。
在之前的版本中Unity的关卡切换使用的是：

Application.loadedLevel()

看看Application类，此时这个类的功能比较繁杂，比较多。只看与关卡相关的：

        [Obsolete("Use SceneManager.LoadScene")]        public static void LoadLevel(string name);        [Obsolete("Use SceneManager.LoadScene")]        public static void LoadLevel(int index);        [Obsolete("Use SceneManager.LoadScene")]        public static void LoadLevelAdditive(string name);        [Obsolete("Use SceneManager.LoadScene")]        public static void LoadLevelAdditive(int index);  //        // 摘要:        //     ///        //     Unloads all GameObject associated with the given scene. Note that assets are        //     currently not unloaded, in order to free up asset memory call Resources.UnloadAllUnusedAssets.        //     ///        //        // 参数:        //   index:        //     Index of the scene in the PlayerSettings to unload.        //        //   scenePath:        //     Name of the scene to Unload.        //        // 返回结果:        //     ///        //     Return true if the scene is unloaded.        //     ///        [Obsolete("Use SceneManager.UnloadScene")]        public static bool UnloadLevel(string scenePath);        //        // 摘要:        //     ///        //     Unloads all GameObject associated with the given scene. Note that assets are        //     currently not unloaded, in order to free up asset memory call Resources.UnloadAllUnusedAssets.        //     ///        //        // 参数:        //   index:        //     Index of the scene in the PlayerSettings to unload.        //        //   scenePath:        //     Name of the scene to Unload.        //        // 返回结果:        //     ///        //     Return true if the scene is unloaded.        //     ///        [Obsolete("Use SceneManager.UnloadScene")]        public static bool UnloadLevel(int index);

这是之前的Application中的关卡的加载和卸载。
当然现在在新版本（Unity5.3以上）中，有了新的变化，那就是SceneManager类了处理。

二、Untiy的SceneManager类

自从Unity5.3版本，Unity 的关卡切换就添加了新的SceneManager的类来处理。
当然要安装过了Unity文档帮助，并且给下面路径一样，就可以知道在本地打开。
本地链接：
file:///C:/Program%20Files/Unity5.3.0/Editor/Data/Documentation/en/Manual/UpgradeGuide53.html
也可以在Unity中搜索SceneManager来查看。

#region 程序集 UnityEngine, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null// H:\Unity\UnityProject\ShiftLevels\Library\UnityAssemblies\UnityEngine.dll#endregionusing UnityEngine.Internal;namespace UnityEngine.SceneManagement{    //    // 摘要:    //     ///    //     Scene management at run-time.    //     ///    public class SceneManager    {        public SceneManager();        public static int sceneCount { get; }        //        public static int sceneCountInBuildSettings { get; }        public static Scene GetActiveScene();        public static Scene[] GetAllScenes();        // 参数:        //   index:        //     Index of the scene to get. Index must be greater than or equal to 0 and less        //     than SceneManager.sceneCount.        public static Scene GetSceneAt(int index);        // 返回结果:        //     ///        //     The scene if found or an invalid scene if not.        //     ///        public static Scene GetSceneByName(string name);        //     Searches all scenes added to the SceneManager for a scene that has the given        //     asset path.        //     ///        //        // 参数:        //   scenePath:        //     Path of the scene. Should be relative to the project folder. Like: "AssetsMyScenesMyScene.unity".        public static Scene GetSceneByPath(string scenePath);        [ExcludeFromDocs]        public static void LoadScene(int sceneBuildIndex);        [ExcludeFromDocs]        public static void LoadScene(string sceneName);        // 参数:        //   sceneName:        //     Name of the scene to load.        //        //   sceneBuildIndex:        //     Index of the scene in the Build Settings to load.        //        //   mode:        //     Allows you to specify whether or not to load the scene additively. See SceneManagement.LoadSceneMode        //     for more information about the options.        public static void LoadScene(int sceneBuildIndex, [DefaultValue("LoadSceneMode.Single")] LoadSceneMode mode);        // 参数:        //   sceneName:        //     Name of the scene to load.        //        //   sceneBuildIndex:        //     Index of the scene in the Build Settings to load.        //        //   mode:        //     Allows you to specify whether or not to load the scene additively. See SceneManagement.LoadSceneMode        //     for more information about the options.        public static void LoadScene(string sceneName, [DefaultValue("LoadSceneMode.Single")] LoadSceneMode mode);        [ExcludeFromDocs]        public static AsyncOperation LoadSceneAsync(int sceneBuildIndex);        [ExcludeFromDocs]        public static AsyncOperation LoadSceneAsync(string sceneName);        // 参数:        //   sceneName:        //     Name of the scene to load.        //        //   sceneBuildIndex:        //     Index of the scene in the Build Settings to load.        //        //   mode:        //     If LoadSceneMode.Single then all current scenes will be unloaded before loading.        public static AsyncOperation LoadSceneAsync(int sceneBuildIndex, [DefaultValue("LoadSceneMode.Single")] LoadSceneMode mode);        // 参数:        //   sceneName:        //     Name of the scene to load.        //        //   sceneBuildIndex:        //     Index of the scene in the Build Settings to load.        //        //   mode:        //     If LoadSceneMode.Single then all current scenes will be unloaded before loading.        public static AsyncOperation LoadSceneAsync(string sceneName, [DefaultValue("LoadSceneMode.Single")] LoadSceneMode mode);        //        // 参数:        //   sourceScene:        //     The scene that will be merged into the destination scene.        //        //   destinationScene:        //     Existing scene to merge the source scene into.        public static void MergeScenes(Scene sourceScene, Scene destinationScene);        //        // 摘要:        //     ///        //     Move a GameObject from its current scene to a new scene. /// It is required that        //     the GameObject is at the root of its current scene.        //     ///        //        // 参数:        //   go:        //     GameObject to move.        //        //   scene:        //     Scene to move into.        public static void MoveGameObjectToScene(GameObject go, Scene scene);        //        // 返回结果:        //     ///        //     Returns false if the scene is not loaded yet.        //     ///        public static bool SetActiveScene(Scene scene);        //     ///        public static bool UnloadScene(string sceneName);        //        // 摘要:        //     ///        //     Unloads all GameObjects associated with the given scene. Note that assets are        //     currently not unloaded, in order to free up asset memory call Resources.UnloadAllUnusedAssets.        //     ///        //        // 参数:        //   sceneBuildIndex:        //     Index of the scene in the Build Settings to unload.        //        //   sceneName:        //     Name of the scene to unload.        //        // 返回结果:        //     ///        //     Returns true if the scene is unloaded.        //     ///        public static bool UnloadScene(int sceneBuildIndex);    }}

注意的是这里面还有可以带对象来在关卡中移动的，还有穿越功能啊！！哈哈

三、5.3的实现代码

上代码：

/**************************************************************************Copyright:@cartzhangAuthor: cartzhangDate: 2016-04-01Description:加载关卡，可以分组加载和卸载。使用Unity版本为5.3.0.因为里面使用了场景管理的一个类，这个类在5.3.0以上版本才添加的。测试操作：使用空格键来切换场景，然后间隔5秒后才开始卸载。**************************************************************************/using UnityEngine;using System.Collections;using UnityEngine.SceneManagement;[System.Serializable]public class LevelOrder{    [Header("每组关卡名称")]    public string[] LevelNames;}public class ChangLevelsHasMain : MonoBehaviour{    [Header("所有关卡列表")]    public LevelOrder[] levelOrder;    private static int index;    private int totalLevels = 0;    private int levelOrderLength;    void Start ()    {        for (int i = 0; i < levelOrder.Length; i++)        {            totalLevels += levelOrder[i].LevelNames.Length;        }        if (totalLevels != SceneManager.sceneCountInBuildSettings)        {        }        levelOrderLength = levelOrder.Length;    }    // Update is called once per frame    void Update ()    {        if (Input.GetKeyDown(KeyCode.Space))        {            bool isOk = LoadNextLevels();            if (isOk)            {                InvokeRepeating("UnloadLastLevel", 2.0f, 5);            }        }    }    bool LoadNextLevels()    {        bool bResult = true;        //index = index % levelOrderLength;        if (index < 0 || index >= levelOrderLength)        {            bResult = false;            return bResult;        }        int LoadTimes = levelOrder[index].LevelNames.Length;        for (int i = 0; i < LoadTimes; i++)        {            SceneManager.LoadSceneAsync(levelOrder[index].LevelNames[i], LoadSceneMode.Additive);        }        return bResult;    }    void UnloadLastLevel()    {        if (index == 0)        {            index++;            CancelInvoke("UnloadLastLevel");            return;        }        // 上一組的關卡        int TmpLast = (index - 1) >= 0 ? (index - 1) : levelOrderLength - 1;        int LoadTimes = levelOrder[index].LevelNames.Length;        for (int i = 0; i < LoadTimes; i++)        {            Scene Tmp = SceneManager.GetSceneByName(levelOrder[index].LevelNames[i]);            if (!Tmp.isLoaded)            {                return;            }        }        // 下一關卡全部加載完畢後，卸載之前關卡        for (int i = 0; i < levelOrder[TmpLast].LevelNames.Length; i++)        {            SceneManager.UnloadScene(levelOrder[TmpLast].LevelNames[i]);        }        index++;        CancelInvoke("UnloadLastLevel");    }}