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我們遊戲中存在好多種訊息機制即二次確認框，這也是遊戲中非常重要的一部分，這可以給玩家帶來更好的體驗，而我們做遊戲的目標不就是給玩家創造美好的體驗麼？
一下是我在開發專案中開發的一個提示框元件即二次確認框：

Enum MessageBoxButtons
{
OK,
Cancel,
Sure
}

using UnityEngine;
using System;
using System.Collections;

    // 對話提示框顯示元件
    public class MessageBox : MonoBehaviour
    {
        public static MessageBox Instance { get { return instance; } }
        
        private static MessageBox instance = null;

        // 是否點選任意處關閉對話提示框
        private bool isAnywhereQuit;

        private GameObject goOK;
        private GameObject goCancel;
        private GameObject goSure;

        private UILabel labelMessage;
        private UILabel labelOK;
        private UILabel labelCancel;
        private UILabel labelSure;
        
<span style="white-space:pre">	</span>// 都是點選確認，取消還有空白處的回撥函式
        private Action firstCallback;
        private Action secondCallback;
        private Action thirdCallback;
        private Action callback;
        private Action anyWhereCallback;
        
        void Awake()
        {
            instance = this;
            
            var refs                = GetComponent<GameObjectRef>();

            goOK                    = refs["OK"];
            goCancel                = refs["Cancel"];
            goSure                  = refs["Sure"];

            goOK.SetActive(false);
            goCancel.SetActive(false);
            goSure.SetActive(false);

            labelMessage            = refs["Label_Message"].GetComponent<UILabel>();
            labelOK                 = refs["Label_OK"].GetComponent<UILabel>();
            labelCancel             = refs["Label_Cancel"].GetComponent<UILabel>();
            labelSure               = refs["Label_Sure"].GetComponent<UILabel>();
        }

        void OnDisable()
        {
            isAnywhereQuit = false;
        }

        public void Show(string message, MessageBoxButtons firstButton, Action firstCallback, 
                         MessageBoxButtons secondButton, Action secondCallback, Action callback, bool isAnywhereQuit = false)
        {
            Show(message, firstButton, firstCallback, secondButton, secondCallback, isAnywhereQuit);
            this.callback = callback;
        }

        // 顯示三個按鈕
        public void Show(string message, string firstButtonText, Action firstCallback,
                         string secondButtonText, Action secondCallback,
                         string thirdButtonText, Action thirdCallback,
                         bool isAnywhereQuit = false, Action anyWhereCallback = null)
        {
            showMessageBox(true);

            labelMessage.text = message;
            labelOK.text = firstButtonText;
            labelCancel.text = secondButtonText;
            labelSure.text = thirdButtonText;

            this.firstCallback = firstCallback;
            this.secondCallback = secondCallback;
            this.thirdCallback = thirdCallback;
            this.isAnywhereQuit = isAnywhereQuit;
            this.anyWhereCallback = anyWhereCallback;

            goOK.SetActive(true);
            goCancel.SetActive(true);
            goSure.SetActive(true);
        }

        // 顯示兩個按鈕
        public void Show(string message, MessageBoxButtons firstButton, Action firstCallback, 
                         MessageBoxButtons secondButton, Action secondCallback, bool isAnywhereQuit = false, Action anyWhereCallback = null)
        {
            showMessageBox(true);
            
            labelMessage.text = message;
            showButtonLabelText(labelOK, firstButton);
            showButtonLabelText(labelCancel, secondButton);
            
            this.firstCallback = firstCallback;
            this.secondCallback = secondCallback;
            this.isAnywhereQuit = isAnywhereQuit;
            this.anyWhereCallback = anyWhereCallback;

            goOK.SetActive(true);
            goCancel.SetActive(true);
            goSure.SetActive(false);
        }

        // 只顯示一個按鈕
        public void Show(string message, MessageBoxButtons button, Action callback, bool isAnywhereQuit = false)
        {
            showMessageBox(true);
            
            labelMessage.text = message;
            showButtonLabelText(labelSure, button);
            
            this.thirdCallback = callback;
            this.isAnywhereQuit = isAnywhereQuit;

            goOK.SetActive(false);
            goCancel.SetActive(false);
            goSure.SetActive(true);
        }

        public void ShowMessageBox(bool isActive)
        {
            showMessageBox(isActive);
        }

        public GameObject GetOKButton()
        {
            return goOK;
        }

        private void showMessageBox(bool isActive)
        {
            this.gameObject.SetActive(isActive);
            GUIResource.ToggleTooltipUICamera(isActive);
        }

        // 根據按鈕型別，顯示按鈕label上的文字
        private void showButtonLabelText(UILabel label, MessageBoxButtons button)
        {
            switch(button)
            {
            case MessageBoxButtons.OK:
                label.text = StringTable.ST_OK;
                break;

            case MessageBoxButtons.Cancel:
                label.text = StringTable.ST_CANCEL;
                break;

            case MessageBoxButtons.Yes:
                label.text = StringTable.ST_YES;
                break;

            case MessageBoxButtons.No:
                label.text = StringTable.ST_NO;
                break;

            default:
                break;
            }
        }
        
        private void onClickOKButton()
        {
            showMessageBox(false);
            
            if (firstCallback != null)
            {
                firstCallback();
            }

            if (callback != null)
            {
                callback();
                callback = null;
            }
        }
        
        private void onClickCancelButton()
        {
            showMessageBox(false);
            
            if (secondCallback != null)
            {
                secondCallback();
            }

            if (callback != null)
            {
                callback();
                callback = null;
            }
        }

        private void onClickSureButton()
        {
            showMessageBox(false);
            
            if (thirdCallback != null)
            {
                thirdCallback();
                thirdCallback = null;
            }
            
            if (callback != null)
            {
                callback();
                callback = null;
            }
        }

        private void onClickMessageBox()
        {
            if (isAnywhereQuit)
            {
                showMessageBox(false);

                if (anyWhereCallback != null)
                {
                    anyWhereCallback();
                    anyWhereCallback = null;
                }
            }
        }
        // end of class
    }
 

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