//显示时间
public static void UpdataTime (float time)
{
int minute = (int)(time / 60);
int seconds = (int)(time % 60);
instence.timeText.text = minute.ToString("00") + ":" + seconds.ToString("00");
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
///


/// 倒计时
///
public class CountdownTimer : MonoBehaviour
{
//需求：1秒修改1次Text文本内容
//1.查找组件引用
//2.定义变量秒second
//3.120 --> 02:00
//4.修改文本

private Text textTimer;
public int second = 120;
private void Start()
{
    textTimer = GetComponent<Text>();
    //Time3
    //重复调用（被执行的方法名称，第一次执行时机，每次执行间隔）
    InvokeRepeating("Timer3", 1, 1);
    //invoke(被执行的方法，开始调用时机);

}



private void Update()
{
    //Timer2();
}

private float nextTime = 1;//下次修改时间
//方法1：Time.time
//先做 再等
private void Timer1()
{
    //如果到了修改时间
    if (Time.time > nextTime)
    {
        second--;
        textTimer.text = string.Format("{0:d2}:{1:d2}", second / 60, second % 60);

        if (second <= 10)
        {
            this.textTimer.color = Color.red;
        }

        //设置下次修改时间
        nextTime = Time.time + 1;
    }
}

private float totalTime;
//方法2：Time.deltatime
//先等 再做
private void Timer2()
{
    //累加每帧间隔
    totalTime += Time.deltaTime;

    if (totalTime >= 1)
    {
        second--;
        textTimer.text = string.Format("{0:d2}:{1:d2}", second / 60, second % 60);

        if (second <= 10)
        {
            this.textTimer.color = Color.red;
        }

        totalTime = 0;
    }
   

}

//方法3：invoke()
//每隔固定时间，重复执行
private void Timer3()
{

    second--;
    textTimer.text = string.Format("{0:d2}:{1:d2}", second / 60, second % 60);

    if (second <= 10)
    {
        this.textTimer.color = Color.red;
    }

    if (second <=0)
    {
        //print("stop");
        CancelInvoke("Timer3" );//取消方法调用
    }

}

//5.如何一秒修改一次
//重点：在Updata每帧执行的方法中，个别语句实现制定间隔执行一次

}