关卡界面选择

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class ShowTitle : MonoBehaviour {

    void Start()
    {
        //获取关卡编号
        int index = Singleton.GetInstance ().currentLevelIndex;
        //显示关卡编号到UI
        GetComponent<Text> ().text = "Level " + index.ToString ();
    }
}

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class NumberLimit : MonoBehaviour {

    public void OnNumberTextValueChange(string msg)
    {
        //如果用户输入的是一个数字
        if (msg != "" && msg != "-") {
            //获取用户输入的数字
            int num = System.Convert.ToInt32 (msg);
            //限制用户输入的字符为0-3
            num = Mathf.Clamp (num, 0, 3);
            //把规范的数字显示到输入框
            GetComponent<InputField> ().text = num.ToString ();
        } else {
            //如果用户输入了‘-’，手动设置为空字符串“”
            GetComponent<InputField> ().text = "";
        }
    }

}

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.SceneManagement;

public class OKButton : MonoBehaviour {

    //输入框
    public InputField inputF;

    private Singleton ins;

    void Start()
    {
        ins = Singleton.GetInstance ();
    }

    public void OnOKButtonClick()
    {
        //存储当前关卡所获得的星星数量

        //第几关
        int levelIndex = ins.currentLevelIndex;
        //几颗星（默认0个）
        int stars = 0;
        //如果用户有输入内容，将用户输入星星数量保存
        if (inputF.text != "") {
            stars = System.Convert.ToInt32(inputF.text);
        }
        //判断字典内是否有当前关卡的数据
        if (ins.data.ContainsKey (levelIndex)) {
            //更新当前关的数据（星星数量）
            ins.data [levelIndex] = Mathf.Max (stars, ins.data [levelIndex]);
        } else {
            //添加该关卡的数据
            ins.data.Add (levelIndex, stars);
        }
        //最大关卡数
        ins.maxLevelIndex++;
        //切换回选择关卡场景
        SceneManager.LoadScene("LevelSelect");
    }
}

第三个脚本引用到的单例在下面，单例中储存了关卡数

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

public class Singleton {

    //单例
    private static Singleton instance;

    /// <summary>
    /// 获取单例
    /// </summary>
    /// <returns>The instance.</returns>
    public static Singleton GetInstance()
    {
        if (instance == null) {
            instance = new Singleton ();
        }
        return instance;
    }
    //构造私有化
    private Singleton()
    {
        //实例化字典
        data = new Dictionary<int, int> ();
    }
    /// <summary>
    /// 当前选择的关卡编号
    /// </summary>
    public int currentLevelIndex = 0;
    /// <summary>
    /// 关卡所对应的星星数量
    /// </summary>
    public Dictionary<int,int> data;
    //当前玩家玩到的最高关卡
    public int maxLevelIndex = 1;
}

接下来进入另外一个场景就是具体关卡数量

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class SelectedController : MonoBehaviour {

    /// <summary>
    /// 关卡按钮点击事件
    /// </summary>
    /// <param name="currentButton">被点击的按钮.</param>
    public void OnLevelButtonClick(Transform currentButton)
    {
        //获取当前按钮是否被锁
        bool active = currentButton.GetChild (2).gameObject.activeSelf;
        //如果当前按钮没被锁定
        if (!active) {
            //设置该按钮为选择框的父物体
            transform.SetParent (currentButton);
            //设置相对于父物体的坐标为000，即将红框移动到所点击的按钮身上
            transform.localPosition = Vector3.zero;
        }
    }
}

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.SceneManagement;

public class YesButton : MonoBehaviour {

    private Transform selected;

    void Start()
    {
        //查找到红框
        selected = GameObject.FindWithTag ("Selected").transform;
    }

    /// <summary>
    /// 确定按钮点击事件
    /// </summary>
    public void OnYesButtonClick()
    {
        //记录关卡编号
        int index = System.Convert.ToInt32(selected.parent.
            GetChild(0).GetComponent<Text>().text);
        //传入单例存储
        Singleton.GetInstance ().currentLevelIndex = index;
        //切换场景
        SceneManager.LoadScene("GameStar");
    }

}

最后是星星解锁后的显示

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

public class ShowStars : MonoBehaviour {

    private Singleton ins;

    void Start()
    {
        Init ();
    }

    /// <summary>
    /// 关卡信息初始化
    /// </summary>
    void Init ()
    {
        //获取数据
        Dictionary<int,int> data = Singleton.GetInstance ().data;
        //遍历数据
        foreach (var item in data) {
            //获取当前的关卡
            Transform currentLevel = transform.GetChild (item.Key - 1);
            //显示星星
            currentLevel.GetChild (1).gameObject.SetActive (true);
            //隐藏锁
            currentLevel.GetChild (2).gameObject.SetActive (false);
            //临时存储星星的父对象
            Transform currentStars = currentLevel.GetChild (1);
            //0、1、2、3四种情况
            switch (item.Value) {
            case 0:
                //隐藏三颗星星
                for (int i = 0; i < currentStars.childCount; i++) {
                    //隐藏
                    currentStars.GetChild (i).gameObject.SetActive (false);
                }
                break;
            case 1:
                for (int i = 1; i < currentStars.childCount; i++) {
                    //隐藏
                    currentStars.GetChild (i).gameObject.SetActive (false);
                }
                break;
            case 2:
                //隐藏第三颗星星
                currentStars.GetChild (1).gameObject.SetActive (false);
                break;
            case 3:
                break;
            default:
                break;
            }
        }
        //解锁下一关
        transform.GetChild (data.Count).GetChild (2).gameObject.SetActive (false);
    }
}