unity3d游戏开发 —— 倒计时

用GUI实现倒计时：

方法一：利用Time.time,这是以秒计算到游戏开始的时间。也就是说，从游戏开始到到现在所用的时间。

代码如下：

using UnityEngine; using System.Collections; public class displayTime : MonoBehaviour { //数值
    public string myStringScore; public float x = 85; public float y = 19; public float scale = 1; public Color myColor; //定义数组
    public Texture[] myNumber = new Texture[10]; //public Texture Tex; //     private int index = 0; private int width = 30; private int height = 30; public float allTime = 100; public float countTime; void Start() { allTime = allTime + Time.time; } void FixedUpdate() { countTime = allTime - Time.time; //print(countTime);
        myStringScore = countTime.ToString(); if (countTime <= 0) { //游戏结束之后进行设置
            countTime = 0; //Application.LoadLevelAdditive(4); //Application.Quit();//退出游戏 // print("countTime"); // return;
 } else { return; } } void Update() { } // Use this for initialization
    void OnGUI() { GUI.color = myColor; if (myStringScore != null) { for (int i = 0; i < myStringScore.Length; i++) { if (myStringScore.Substring(i, 1) == ".") { break; } GUI.DrawTexture(new Rect(x + i * scale * width, y, scale * width, scale * height), myNumber[int.Parse(myStringScore.Substring(i, 1))], ScaleMode.StretchToFill, true, 0); //GUI.DrawTexture(new Rect(x + i * scale * width, y, scale * width, scale * height),myNumber[myStringScore[i]-48]);
 } } } }

绑定代码到Camera上，设置倒计时10个数图片：

 

 

---

 

 方法二：使用yield return new WaitForSeconds(1);等待1秒

using UnityEngine;
using System.Collections;

public class CoolTime : MonoBehaviour {
    // Use this for initialization
    void Start () {
    }
    int CoolTimes = 100;
    // Update is called once per frame
    void Update () {

    }
    void OnGUI()
    {
        GUILayout.Label(CoolTimes.ToString());
        if (GUILayout.Button("Begin"))
        {
            StartCoroutine(waitForOneSecond());
        }
    }

    public IEnumerator waitForOneSecond()
    {
        while (CoolTimes >= 0)
        {
            CoolTimes--;
            yield return new WaitForSeconds(1);   
        }
    }
}