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

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

//持久化的处理脚本，在app启动时就应开始常驻
public class PersistenHandler : MonoBehaviour
{
    public static PersistenHandler ins;

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

    long lastPressExitTime = 0;

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Escape)) {
            long lastLast = lastPressExitTime;
            lastPressExitTime = JC.CS.Utility.GetTimestamp();
            if (lastPressExitTime - lastLast < 10 * 1000) {
                Application.Quit();
            } else {
                PopupMgr.ins.ShowTip("再按一次退出APP");
            }
        }
    }
}