public static void DontDestroyOnLoad (Object target);

パラメーター

targetAn Object not destroyed on Scene change.

説明

Do not destroy the target Object when loading a new Scene.

The load of a new Scene destroys all current Scene objects. Call Object.DontDestroyOnLoad to preserve an Object during level loading. If the target Object is a component or GameObject, Unity also preserves all of the Transform’s children. Object.DontDestroyOnLoad does not return a value.

The following example script uses Object.DontDestroyOnLoad. The example has scene1 which starts playing background music from an AudioSource. The music continues when scene2 loads. Switch between scenes using a button.

To implement this example, create two new Scenes, named scene1 and scene2. Open scene1 and add the SceneSwap.cs script to an empty GameObject and name it Menu. Next, add DontDestroy.cs to a new GameObject and name it BackgroundMusic. Add an AudioSource to BackgroundMusic - Add Component > Audio > Audio Source - and import an AudioClip into your Project. Assign the AudioClip to the AudioSource’s AudioClip field. Create a tag, call it music, and add it to BackgroundMusic. Switch to scene2. Again add SceneSwap.cs to a new GameObject and name it Menu. Save the Project. Return to scene1 and run the Project from the Editor.

SceneSwap.cs script:

using UnityEngine;
using UnityEngine.SceneManagement;

// Object.DontDestroyOnLoad example. // // Two scenes call each other. This happens when OnGUI button is clicked. // scene1 will load scene2; scene2 will load scene1. Both scenes have // the Menu GameObject with the SceneSwap.cs script attached. // // AudioSource plays an AudioClip as the game runs. This is on the // BackgroundMusic GameObject which has a music tag. The audio // starts in AudioSource.playOnAwake. The DontDestroy.cs script // is attached to BackgroundMusic.

public class SceneSwap : MonoBehaviour { private void OnGUI() { int xCenter = (Screen.width / 2); int yCenter = (Screen.height / 2); int width = 400; int height = 120;

GUIStyle fontSize = new GUIStyle(GUI.skin.GetStyle("button")); fontSize.fontSize = 32;

Scene scene = SceneManager.GetActiveScene();

if (scene.name == "scene1") { // Show a button to allow scene2 to be switched to. if (GUI.Button(new Rect(xCenter - width / 2, yCenter - height / 2, width, height), "Load second scene", fontSize)) { SceneManager.LoadScene("scene2"); } } else { // Show a button to allow scene1 to be returned to. if (GUI.Button(new Rect(xCenter - width / 2, yCenter - height / 2, width, height), "Return to first scene", fontSize)) { SceneManager.LoadScene("scene1"); } } } }

DontDestroy.cs script:

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

// Object.DontDestroyOnLoad example. // // This script example manages the playing audio. The GameObject with the // "music" tag is the BackgroundMusic GameObject. The AudioSource has the // audio attached to the AudioClip.

public class DontDestroy : MonoBehaviour { void Awake() { GameObject[] objs = GameObject.FindGameObjectsWithTag("music");

if (objs.Length > 1) { Destroy(this.gameObject); }

DontDestroyOnLoad(this.gameObject); } }