yichael_smartbow/Assets/BowArrow/Scripts/Expand/PersistenHandler.cs

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

//持久化的处理脚本，在app启动时就应开始常驻
public class PersistenHandler : MonoBehaviour
{
    public MenuBackController menuBackCtr = new MenuBackController();

    public static PersistenHandler ins;
    public static void Init() {
        if (ins) return;
        GameObject obj = new GameObject("PersistenHandler");
        ins = obj.AddComponent<PersistenHandler>();
        DontDestroyOnLoad(obj);
    }

    void Update()
    {
        menuBackCtr.Update();
    }
}
public class MenuBackController {
    public List<MenuBackInterface> views = new List<MenuBackInterface>();
    long lastPressExitTime = 0;
    public void Update()
    {
        if (Input.GetKeyDown(KeyCode.Escape)) {
            long lastLast = lastPressExitTime;
            lastPressExitTime = JC.CS.Utility.GetTimestamp();
            if (lastPressExitTime - lastLast < 10 * 1000) {
                OnTwiceBack();
            } else {
                OnOnceBack();
            }
        }
    }
    public void BanTwice() {
        lastPressExitTime = 0;
    }
    public void OnOnceBack() {
        var sceneName = SceneManager.GetActiveScene().name;
        if (sceneName == "Entry") {
            BanTwice();
            Debug.Log("菜单退出: " + sceneName);
            Application.Quit();
            return;
        }
        if (sceneName.StartsWith("Game")) {
            BanTwice();
            Debug.Log("菜单返回主页");
            SceneManager.LoadScene("Home", LoadSceneMode.Single);
            return;
        }
        if (views.Count > 0) {
            BanTwice();
            MenuBackInterface i = views[views.Count - 1];
            if (i.OnMenuBack()) {
                views.Remove(i);
                Debug.Log("菜单返回成功: " + i);
            } else {
                Debug.Log("菜单返回失败: " + i);
            }
            return;
        }
        Debug.Log("菜单退出APP询问");
        PopupMgr.ins.ShowTip("再按一次退出APP");
    }
    public void OnTwiceBack() {
        Debug.Log("菜单退出APP");
        Application.Quit();
    }
}
public interface MenuBackInterface {
    public bool OnMenuBack();
}