Unity 場景切換 DontDestroyOnLoad + SceneManager 教學

＝＝PlayerController＝＝

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

public class PlayerController : MonoBehaviour {
    Rigidbody2D playerRigidbody2D;
    public float speed;

    void Start () {
        playerRigidbody2D = GetComponent<Rigidbody2D>();  
 }
 
 void Update () {
        if (Input.GetKey(KeyCode.RightArrow))
        {
            playerRigidbody2D.AddForce(Vector2.right * speed);
        }

        if (Input.GetKey(KeyCode.LeftArrow))
        {
            playerRigidbody2D.AddForce(Vector2.left * speed);
        }
 }
}

＝＝GameManager＝＝

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

public class GameManager : MonoBehaviour {
    //singleton
    //單例模式
    static GameManager instance;
    public int money;
    void Awake () {
        if (instance==null)
        {
            instance = this;
            DontDestroyOnLoad(this);
            name = "最初的遊戲管理物件";
            money = 0;
        }
        else if (this!=instance)
        {
            string sceneName = SceneManager.GetActiveScene().name;
            Debug.Log("刪除場景"+sceneName+"的"+name);
            Destroy(gameObject);
        }       
 }
 
 void Update () {
  
 }
}

＝＝Door＝＝

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

public class Door : MonoBehaviour {

    [Header("連接到某場景")]
    public string goToTheScene;
    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.CompareTag("玩家"))
        {
            SceneManager.LoadScene(goToTheScene);
        }
    }

}

＝＝Gold＝＝

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

public class Gold : MonoBehaviour {

    GameManager gameManager;
    void Awake()
    {
        gameManager = FindObjectOfType<GameManager>();
    }
    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.CompareTag("玩家"))
        {
            gameManager.money += 10;
            Debug.Log("金錢="+gameManager.money);
        }
    }

}