二十七.加载关卡

加载关卡

1.LevelSelectPlayer

添加参数

private bool levelLoading;  //是否正加载场景

Update()中的判断，加入条件，加载场景不能移动

//防止胡乱移动  加载场景时不能移动
if (Vector3.Distance(transform.position, currentPoint.transform.position) < 0.1f && !levelLoading)

判断之后加入跳转关卡信息

//跳转关卡
if (currentPoint.isLevel)
{
    if(Input.GetButtonDown("Jump"))
    {
        levelLoading = true;
        //...
    }
}

2.MapPoint

加入参数，表示待加载的关卡

public string levelToLoad;  //待加载的关卡

在关卡节点，分别设置levelToLoad的值，指定对应的加载的场景名

3.新建空节点LSManager

节点用来管理关卡选择

再新建c#脚本LSManager.cs，绑定至节点上

引入头文件

using UnityEngine.SceneManagement;

添加参数，获取当前Player

public LevelSelectPlayer thePlayer;

添加跳转场景代码

public void LoadLevel()
{
    StartCoroutine(LoadLevelCo());
}

public IEnumerator LoadLevelCo()
{
    yield return new WaitForSeconds(1f);

    SceneManager.LoadScene(thePlayer.currentPoint.levelToLoad);
}

将Player拖到对应的thePlayer

4.完善LevelSelectPlayer跳转场景

添加参数，指向LSManager

public LSManager theManager;    //关卡选择管理

将LSManager节点拖到对应的theManager上

完善加载场景代码

//跳转关卡
if (currentPoint.isLevel && currentPoint.levelToLoad != "")
{
    if(Input.GetButtonDown("Jump"))
    {
        levelLoading = true;
        //加载场景
        theManager.LoadLevel();
    }
}

5.加入淡入淡出效果

添加UI->Canvas组件到场景

在Canvas下，新建Panel，设置属性

新建关卡选择UI管理脚本LSUIController，添加组件到Canvas下绑定

添加头文件UI的引用

using UnityEngine.UI;

添加淡入淡出代码（与UIController相似）

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class LSUIController : MonoBehaviour
{
    public static LSUIController sInstance;

    //淡入淡出
    public Image fadeScreen;
    public float fadeSpeed;
    private bool shouldFadeToBlack;
    private bool shouldFadeFromBlack;

    private void Awake()
    {
        sInstance = this;
    }
    // Start is called before the first frame update
    void Start()
    {
        //开始时添加淡入效果
        FadeFromBlack();
    }

    // Update is called once per frame
    void Update()
    {
        if (shouldFadeToBlack)
        {
            fadeScreen.color = new Color(fadeScreen.color.r, fadeScreen.color.g, fadeScreen.color.b, Mathf.MoveTowards(fadeScreen.color.a, 1f, fadeSpeed * Time.deltaTime));
            if (fadeScreen.color.a == 1f)
            {
                shouldFadeToBlack = false;
            }
        }
        if (shouldFadeFromBlack)
        {
            fadeScreen.color = new Color(fadeScreen.color.r, fadeScreen.color.g, fadeScreen.color.b, Mathf.MoveTowards(fadeScreen.color.a, 0f, fadeSpeed * Time.deltaTime));
            if (fadeScreen.color.a == 0f)
            {
                shouldFadeFromBlack = false;
            }
        }
    }

    public void FadeToBlack()
    {
        shouldFadeToBlack = true;
        shouldFadeFromBlack = false;
    }
    public void FadeFromBlack()
    {
        shouldFadeFromBlack = true;
        shouldFadeToBlack = false;
    }
}

修改Panel为FadeScreen，拖入到对应的FadeScreen，并设置FadeSpeed值

最后，修改LSManager中加载场景，加入淡入

public IEnumerator LoadLevelCo()
{
    LSUIController.sInstance.FadeToBlack();

    yield return new WaitForSeconds(1f / LSUIController.sInstance.fadeSpeed + 0.25f);

    SceneManager.LoadScene(thePlayer.currentPoint.levelToLoad);
}