SceneManager.activeSceneChanged

参数

描述

订阅此事件可在活动场景发生变化时收到通知。

此添加到 activeSceneChanged 中的脚本具有两个隐藏参数，它们是被替换的场景和下一个场景。参数不可见。

在编辑器中，此事件仅在播放模式（而非编辑模式）下发送。如果需要在编辑模式下发送事件，请使用 EditorSceneManager.activeSceneChanged。

// SceneManager.activeSceneChanged
//
// This example configures Scene1 to wait for 1.5 seconds before switching to Scene2.
// Scene1 is the replaced Scene; Scene2 is the new loaded Scene.

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

public class ScriptExample1 : MonoBehaviour
{
    public delegate void Change();
    public static event Change TimeChanged;

    public void Start()
    {
        SceneManager.activeSceneChanged += ChangedActiveScene;

        // wait 1.5 seconds before change to Scene2
        StartCoroutine(TimeChangedScene());
    }

    IEnumerator TimeChangedScene()
    {
        print(Time.time + " seconds");
        yield return new WaitForSeconds(1.5f);
        print(Time.time + " seconds");

        // call the event
        TimeChanged();
    }

    private void ChangedActiveScene(Scene current, Scene next)
    {
        string currentName = current.name;

        if (currentName == null)
        {
            // Scene1 has been removed
            currentName = "Replaced";
        }

        Debug.Log("Scenes: " + currentName + ", " + next.name);
    }

    void OnEnable()
    {
        Debug.Log("OnEnable");
        ScriptExample1.TimeChanged += ChangeScene;
    }

    void ChangeScene()
    {
        Debug.Log("Changing to Scene2");
        SceneManager.LoadScene("Scene2");

        Scene scene = SceneManager.GetSceneByName("Scene2");
        SceneManager.SetActiveScene(scene);
    }

    void OnDisable()
    {
        ScriptExample1.TimeChanged -= ChangeScene;
        Debug.Log("OnDisable happened for Scene1");
    }
}

ScriptExample2 直接声明这是活动场景。

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

public class ScriptExample2 : MonoBehaviour
{
    void Start()
    {
        Debug.Log("Script2 starting");
    }
}