killapp/Assets/Scripts/UI/UIManager.cs

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Kill.Managers;
using Kill.Network;
using Kill.UI.Components;
using UnityEngine;

namespace Kill.UI
{
    public class UIManager : MonoBehaviour
    {
        public enum PageName
        {
            nullPage = 0,
            loginPage=1,
            safetylearningPage=2,
            homePage=3,
            connectDevicePage=4,
            deviceInfoPage=5
        }
        [System.Serializable]
        public struct Page
        {
            public PageName pageName;
            public string bundleName;
        }
        public static UIManager Instance;
        public List<Page> pages;
        public GameObject nowPage;
        public PageName nowPageName = PageName.nullPage;
        public Transform bg;

        // 返回事件管理
        private Action backAction;
        private bool isMainPage = false;
        private float lastBackTime = 0f;
        private const float DOUBLE_BACK_INTERVAL = 1f;

        void Awake()
        {
            Instance = this;
        }

        void Update()
        {
            // 监听返回键（Android 物理返回键）
            if (Input.GetKeyDown(KeyCode.Escape))
            {
                Debug.Log("返回键被按下");
                OnBackPressed();
            }
        }
        public Action GetBackAction()
        {
            return backAction;
        }
        /// <summary>
        /// 注册返回事件
        /// </summary>
        public void RegisterBackAction(Action action)
        {
            backAction = action;
        }
        Action lastBackAction=null;
        public void AddBackAction(Action action)
        {
            if(backAction!=null)
            {
                lastBackAction=action;
            }
            RegisterBackAction(action);
            
        }
        public void RecoverBackAction()
        {
            if(backAction!=null)
            {
                RegisterBackAction(lastBackAction);
            }
            lastBackAction=null;
        }

        /// <summary>
        /// 清除返回事件
        /// </summary>
        public void ClearBackAction()
        {
            backAction = null;
        }

        /// <summary>
        /// 设置当前是否为主页面
        /// </summary>
        public void SetMainPage(bool isMain)
        {
            isMainPage = isMain;
        }

        /// <summary>
        /// 返回键处理
        /// </summary>
        private void OnBackPressed()
        {
            if(LoadingUI.Instance.loadingPanel.activeSelf)
            {
                return;
            }
            // 如果有注册的返回事件，先执行
            if (backAction != null)
            {
                Debug.Log("执行注册返回");
                var action = backAction;
                action.Invoke();
                return;
            }

            // 没有返回事件时，按主页面处理（双击退出）
            HandleMainPageBack();
        }

        /// <summary>
        /// 处理主页面返回（双击退出）
        /// </summary>
        private void HandleMainPageBack()
        {
            Debug.Log("执行退出");
            if (Time.time - lastBackTime < DOUBLE_BACK_INTERVAL)
            {
                // 退出应用
                Application.Quit();
#if UNITY_EDITOR
                UnityEditor.EditorApplication.isPlaying = false;
#endif
            }
            else
            {
                // 第一次返回，显示提示
                lastBackTime = Time.time;
                ToastUI.Show("100037");
            }
        }

        public async Task Init()
        {
            if (DataManager.Instance.token == "")
            {
                OpenPage(PageName.loginPage, null, false);
            }
            else
            {
                bool hasToken=await DataManager.Instance.TokenLogin();
                if(hasToken)
                    OpenPage(PageName.homePage, null, true);
                else
                    OpenPage(PageName.loginPage);
            }
        }

        public async void OpenPage(PageName pageName, Action backAction = null, bool isMainPage = false)
        {
            Debug.Log("打开页面：" + pageName);

            // 清除之前的返回事件
            ClearBackAction();

            // 销毁旧页面
            switch (nowPageName)
            {
                case PageName.nullPage:
                    break;
                case PageName.loginPage:
                    Destroy(nowPage);
                    break;
                default:
                    Destroy(nowPage);
                    break;
            }

            // 设置返回事件和主页面标记
            if (backAction != null)
            {
                RegisterBackAction(backAction);
            }
            SetMainPage(isMainPage);

            int index = pages.FindIndex(x => x.pageName == pageName);
            switch (pageName)
            {
                case PageName.nullPage:
                    break;

                case PageName.loginPage:
                    string assetName = "loginPage.prefab";
                    GameObject prefab = await LoadRes.Instance.LoadAssetAsync<GameObject>(pages[index].bundleName, assetName);
                    nowPage = Instantiate(prefab, bg);
                    nowPageName = pageName;
                    break;
                case PageName.safetylearningPage:
                    assetName = "safetylearningPage.prefab";
                    prefab = await LoadRes.Instance.LoadAssetAsync<GameObject>(pages[index].bundleName, assetName);
                    nowPage = Instantiate(prefab, bg);
                    nowPageName = pageName;
                    break;
                case PageName.homePage:
                    assetName = "homePage.prefab";
                    prefab = await LoadRes.Instance.LoadAssetAsync<GameObject>(pages[index].bundleName, assetName);
                    nowPage = Instantiate(prefab, bg);
                    nowPageName = pageName;
                    break;
                case PageName.connectDevicePage:
                    assetName = "connectDevicePage.prefab";
                    prefab = await LoadRes.Instance.LoadAssetAsync<GameObject>(pages[index].bundleName, assetName);
                    nowPage = Instantiate(prefab, bg);
                    nowPageName = pageName;
                    break;
                case PageName.deviceInfoPage:
                    assetName = "deviceInfoPage.prefab";
                    prefab = await LoadRes.Instance.LoadAssetAsync<GameObject>(pages[index].bundleName, assetName);
                    nowPage = Instantiate(prefab, bg);
                    nowPageName = pageName;
                    break;
            }
        }

        /// <summary>
        /// 打开子页面（自动注册返回事件）
        /// </summary>
        public void OpenSubPage(PageName pageName, Action backAction)
        {
            OpenPage(pageName, backAction, false);
        }

        /// <summary>
        /// 打开主页面（双击返回退出）
        /// </summary>
        public void OpenMainPage(PageName pageName)
        {
            OpenPage(pageName, null, true);
        }

    }
}