Unity：场景管理

场景类头文件 using UnityEngine.SceneManagement;

AsyncOperation operation;  //异步加载类对象

//1.创建场景,运行结束会销毁
Scene scene = SceneManager.CreateScene("001");

//2.加载场景 LoadSceneMode是加载模式,默认Single模式
SceneManager.LoadScene("002",LoadSceneMode.Additive);

//3.拿到场景
Scene scene2 = SceneManager.GetActiveScene(); //拿到当前活跃的场景(挂载该脚本的场景)
Scene scene3 = SceneManager.GetSceneByName("002");
Scene scene4 = SceneManager.GetSceneByName("003"); // × 返回null,没有加载的场景是拿不到的
}

//4.卸载场景
SceneManager.UnloadSceneAsync("002");

5.异步加载场景

private AsyncOperation operation;  //场景加载类对象

void Start () {
    StartCoroutine(LoadScene());
}
    
IEnumerator LoadScene()
{
    //异步加载场景
    operation = SceneManager.LoadSceneAsync(0);
    yield return operation;
}

6.场景淡入淡出

创建一张Image图片，填充屏幕，脚本挂载Canvas上

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

public class LoadScene : MonoBehaviour
{
    public float fadeSpeed;
    public Image image;
    float colorAlpha;
    bool isQuit;
    void Start()
    {
        image.color = Color.clear;
        DontDestroyOnLoad(gameObject);  //脚本所挂载物体过场不销毁
    }
    private void Update()
    {
        if (!isQuit)
            QuitScene();
        else
            EnterScene();
    }
    void QuitScene()
    {
        colorAlpha = Mathf.Lerp(colorAlpha, 1, Time.deltaTime * fadeSpeed); //渐黑
        if (colorAlpha > 0.95f)
            colorAlpha = 1;
        image.color = new Color(image.color.r, image.color.g, image.color.b, colorAlpha);
        if (colorAlpha == 1)
        {
            isQuit = true;
            SceneManager.LoadScene(0);
        }
    }
    void EnterScene()
    {
        colorAlpha = Mathf.Lerp(colorAlpha, 0, Time.deltaTime * fadeSpeed); //渐白
        if (colorAlpha < 0.05f)
            colorAlpha = 0;
        image.color = new Color(image.color.r, image.color.g, image.color.b, colorAlpha);
        if (colorAlpha==0)
            Destroy(gameObject);
    }
}