Unity3D初级案例-经典贪吃蛇二

引言：承接上一篇贪吃蛇案例！喜欢我的就关注我啊，不然没有继续写的动力啦！！！

开发版本：unity 2017.1.1f1

适合人群：初学Unity者

源文件链接请见文末！

开启学习之旅吧！

 

07 边界传送

完善蛇头的触发检测，使用switch判断蛇头碰撞的墙面

//判断碰撞到物体的名字
                switch (collision.gameObject.name)
                {
                    case "Up":
                        //-transform.localPosition.y + 30 需要注意这里添加一个偏差值，防止蛇头刚移动到底部就碰到底部的碰撞器，下面同理
                        transform.localPosition = new Vector3(transform.localPosition.x, -transform.localPosition.y + 30, transform.localPosition.z);
                        break;
                    case "Down":
                        transform.localPosition = new Vector3(transform.localPosition.x, -transform.localPosition.y - 30, transform.localPosition.z);
                        break;
                    case "Left":
                        transform.localPosition = new Vector3(-transform.localPosition.x + 210, transform.localPosition.y, transform.localPosition.z);
                        break;
                    case "Right":
                        transform.localPosition = new Vector3(-375, transform.localPosition.y, transform.localPosition.z);
                        break;
                }

08 设计UI

首先实现分数和长度的记录

新建MainUIController.cs脚本，做成单例模式

添加UpdateUI()方法，用于外部调用更新UI显示

 

 private static MainUIController instance;
    public static MainUIController Instance
    {
        get
        {
            return instance;
        }
    }
 private void Awake()
    {
        if (instance == null)
        {
            instance = this;
        }
    }
    public int score = 0;
    public int length = 0;
    public Text scoreText;
    public Text lengthText;

 public void UpdateUI(int s = 5, int l = 1)
    {
        score += s;
        length += l;
        scoreText.text = "得分：\n" + score;
        lengthText.text = "长度：\n" + length;
    }

然后在SnakeHead.cs的触发检测中调用

if (collision.gameObject.CompareTag("Food"))
        {
            Destroy(collision.gameObject);
            MainUIController.Instance.UpdateUI();
            AddBody();
            FoodCreator.Instance.CreateFood((Random.Range(0, 100) < 20) ? true : false);
        }
        else if (collision.gameObject.CompareTag("Reward"))
        {
            Destroy(collision.gameObject);
            MainUIController.Instance.UpdateUI(Random.Range(5, 15) * 10);
            AddBody();
        }

 

设计暂停按钮，新建Pause按钮

public bool isPause = false;

 public void Pause()
    {
        isPause = !isPause;
        if (isPause)
        {
            Time.timeScale = 0;
            //按钮图片的切换
            pauseBtn.GetComponent().sprite = pauseSprites[1];
        }
        else
        {
            Time.timeScale = 1;
            pauseBtn.GetComponent().sprite = pauseSprites[0];
        }
    }

 

然后将暂停按钮监听Pause方法

同理，返回键就重新加载场景 注意引用命名空间using UnityEngine.UI;

public void BackToHome()
    {
        SceneManager.LoadScene("StartScene");
    }

 

设立一个布尔值用来判断是否有边界

public bool hasBorder

后续操作待定。。。

 

09 蛇死亡处理

实现蛇死亡特效

在SnakeHead.cs中添加Die()方法

public GameObject dieEffect;

  void Die()
    {
        audioSource.clip = dieClip;
        audioSource.Play();
        //取消蛇移动的InvokeRepeating调用
        CancelInvoke();
        isDie = true;
        //实例化死亡效果
        Instantiate(dieEffect, transform.position - Vector3.forward, Quaternion.identity);
        //数据持久化PlayerPrefs以键值对的形式保存数据，可以保存int、string、float三种数据类型，类似字典
        //Set用于保存数据，Get用于得到数据
        PlayerPrefs.SetInt("lastLength", MainUIController.Instance.length);
        PlayerPrefs.SetInt("lastScore", MainUIController.Instance.score);
        //如果当前分数高于最高分数，就将最高数据进行更换
        //GetInt("bestScore", 0)如果当前有bestScore值的话，则返回该值，如果没有，则返回0
        if (PlayerPrefs.GetInt("bestScore", 0) < MainUIController.Instance.score)
        {
            PlayerPrefs.SetInt("bestLength", MainUIController.Instance.length);
            PlayerPrefs.SetInt("bestScore", MainUIController.Instance.score);
        }
        //开启协成，调用GameOver方法
        StartCoroutine(GameOver(1.5f));
    }

    IEnumerator GameOver(float t)
    {
        //停顿t秒执行下面语句
        yield return new WaitForSeconds(t);
        //重新加载到开始场景
        UnityEngine.SceneManagement.SceneManager.LoadScene("StartScene");
    }

完善蛇头触发检测

private void OnTriggerEnter2D(Collider2D collision)
    {
        if (collision.gameObject.CompareTag("Food"))
        {
            Destroy(collision.gameObject);
            MainUIController.Instance.UpdateUI();
            AddBody();
            FoodCreator.Instance.CreateFood((Random.Range(0, 100) < 20) ? true : false);
        }
        else if (collision.gameObject.CompareTag("Reward"))
        {
            Destroy(collision.gameObject);
            MainUIController.Instance.UpdateUI(Random.Range(5, 15) * 10);
            AddBody();
        }
        else if (collision.gameObject.CompareTag("Body"))
        {
            Die();
        }
        else
        {
            if (MainUIController.Instance.hasBorder)
            {
                Die();
            }
            else
            {
                switch (collision.gameObject.name)
                {
                    case "Up":
                        transform.localPosition = new Vector3(transform.localPosition.x, -transform.localPosition.y + 30, transform.localPosition.z);
                        break;
                    case "Down":
                        transform.localPosition = new Vector3(transform.localPosition.x, -transform.localPosition.y - 30, transform.localPosition.z);
                        break;
                    case "Left":
                        transform.localPosition = new Vector3(-transform.localPosition.x + 210, transform.localPosition.y, transform.localPosition.z);
                        break;
                    case "Right":
                        transform.localPosition = new Vector3(-375, transform.localPosition.y, transform.localPosition.z);
                        break;
                }
            }
        }
    }

 

10 存储用户设置

我们使用数据持久化保存PlayerPrefs来保存用户的设置，实现保存玩家上一次的设置，上一节我们就用该方法保存了游戏的得分

需要将蛇头和所有蛇身的精灵资源放在Resources文件夹中，动态加载资源

新建四个方法BlueSelected(),YellowSelected(),BorderSelected(),NoBorderSelected()，分别绑定开始界面的四个Toggle选项

使用PlayerPrefs来存储用户设置

 

public class StartUIController : MonoBehaviour
{
    public Text lastText;
    public Text bestText;
    public Toggle blue;
    public Toggle yellow;
    public Toggle border;
    public Toggle noBorder;

    private void Start()
    {
        lastText.text = "上次：长度"+PlayerPrefs.GetInt("lastLength",0)+",分数" + PlayerPrefs.GetInt("lastScore", 0);
        bestText.text = "最好：长度" + PlayerPrefs.GetInt("bestLength", 0) + ",分数" + PlayerPrefs.GetInt("bestScore", 0);
        //GetString如果sh已经有值，则判断是否为样式一小蛇，如果用户还没有设置，则默认为样式一
        if (PlayerPrefs.GetString("sh", "sb01") == "sb01")
        {
            blue.isOn = true;
            BlueSelected(true);
        }
        else
        {
            yellow.isOn = true;
            YellowSelected(true);
        }
        //有无边界的判断如上
        if (PlayerPrefs.GetInt("border", 0) == 1)
        {
            border.isOn = true;
            BorderSelected(true);
        }
        else
        {
            noBorder.isOn = true;
            NoBorderSelected(true);
        }
    }

    //选择了样式一小蛇
    public void BlueSelected(bool isOn)
    {
        if (isOn)
        {
            PlayerPrefs.SetString("sh", "sh01");
            PlayerPrefs.SetString("sb01", "sb0101");
            PlayerPrefs.SetString("sb02", "sb0102");
            //如果选择该样式，修改图片颜色，用于区别
            blue.GetComponentInChildren().color = new Color32(1, 159, 232, 90);
        }
        else
        {
            blue.GetComponentInChildren().color = new Color32(1, 159, 232, 50);
        }
    }

    //选择了样式二小蛇
    public void YellowSelected(bool isOn)
    {
        if (isOn)
        {
            PlayerPrefs.SetString("sh", "sh02");
            PlayerPrefs.SetString("sb01", "sb0201");
            PlayerPrefs.SetString("sb02", "sb0202");
            yellow.GetComponentInChildren().color = new Color32(1, 159, 232, 90);
        }
        else
        {
            yellow.GetComponentInChildren().color = new Color32(1, 159, 232, 50);
        }
    }

    //选择有边界模式
    public void BorderSelected(bool isOn)
    {
        if (isOn)
        {
            PlayerPrefs.SetInt("border", 1);
        }
    }

    //选择无边界模式
    public void NoBorderSelected(bool isOn)
    {
        if (isOn)
        {
            PlayerPrefs.SetInt("border", 0);
        }
    }

    //开始游戏
    public void StartGame()
    {
        UnityEngine.SceneManagement.SceneManager.LoadScene("MainScene");
    }
}

 

用户设置已经存储，需要在游戏开始后，SnakeHead.cs中动态读取设置

  private void Awake()
    {
        gameObject.GetComponent().sprite = Resources.Load(PlayerPrefs.GetString("sh", "sh01"));
        bodySprites[0] = Resources.Load(PlayerPrefs.GetString("sb01", "sb0101"));
        bodySprites[1] = Resources.Load(PlayerPrefs.GetString("sb02", "sb0102"));
    }

在MainUIController.cs中读取用户是否设置边界

  private void Start()
    {
        //判断是否设置了边界
        if (PlayerPrefs.GetInt("border", 0) == 0)
        {
            //hasBorder标志位用于判断蛇头碰到边界是否死亡
            hasBorder = false;
            //遍历bgImage父物体下所有子物体
            foreach (Transform item in bgImage.gameObject.transform)
            {
                //在无边界模式下，禁用掉边界
                item.gameObject.GetComponent().enabled = false;
            }
        }
        else
        {
            hasBorder = true;
        }
    }

添加音效和背景音乐都是相同操作，在此不再赘述！

对了，为了方便，我直接设置屏幕大小为1280*720,只需要在awake方法中加Screen.SetResolution(1280, 720,false);

基本完成游戏的开发，大家也可以发挥想象力，再添砖加瓦，完善功能！

 

喜欢小生的请关注我哦！！！

 

素材及工程文件：百度云链接   提取码：gml2