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

 1 private AsyncOperation operation;  //场景加载类对象
 2 
 3 void Start () {
 4     StartCoroutine(LoadScene());
 5 }
 6     
 7 IEnumerator LoadScene()
 8 {
 9     //异步加载场景
10     operation = SceneManager.LoadSceneAsync(0);
11     yield return operation;
12 }

LoadSceneAsync

6.场景淡入淡出

创建一张Image图片，填充屏幕，脚本挂载Canvas上

 1 using System.Collections;
 2 using System.Collections.Generic;
 3 using UnityEngine;
 4 using UnityEngine.UI;
 5 using UnityEngine.SceneManagement;
 6 
 7 public class LoadScene : MonoBehaviour
 8 {
 9     public float fadeSpeed;
10     public Image image;
11     float colorAlpha;
12     bool isQuit;
13     void Start()
14     {
15         image.color = Color.clear;
16         DontDestroyOnLoad(gameObject);  //脚本所挂载物体过场不销毁
17     }
18     private void Update()
19     {
20         if (!isQuit)
21             QuitScene();
22         else
23             EnterScene();
24     }
25     void QuitScene()
26     {
27         colorAlpha = Mathf.Lerp(colorAlpha, 1, Time.deltaTime * fadeSpeed); //渐黑
28         if (colorAlpha > 0.95f)
29             colorAlpha = 1;
30         image.color = new Color(image.color.r, image.color.g, image.color.b, colorAlpha);
31         if (colorAlpha == 1)
32         {
33             isQuit = true;
34             SceneManager.LoadScene(0);
35         }
36     }
37     void EnterScene()
38     {
39         colorAlpha = Mathf.Lerp(colorAlpha, 0, Time.deltaTime * fadeSpeed); //渐白
40         if (colorAlpha < 0.05f)
41             colorAlpha = 0;
42         image.color = new Color(image.color.r, image.color.g, image.color.b, colorAlpha);
43         if (colorAlpha==0)
44             Destroy(gameObject);
45     }
46 }

用Image实现场景淡出淡入