Unity3d之倒计时

public bool isTimeSwitch;
public TextMeshProUGUI timerText;
public int timelimit;

//public float timer;
private float nextTime = 1;
public void OnUpdate()
{
    if (isTimeSwitch)
    {
        OnCountDown();
    }
}
public void OnTime(bool enable, int time)
{
    isTimeSwitch = enable;
    timelimit = time;
    //timer = 0;

    OnTimeIndices(enable);
}
public void OnCountDown()
{
    //计时器
   
    /*timer += Time.deltaTime;
    //当时间累加到一秒 并且 倒计时未终止  
    if (timer >= 1 && timelimit > 0)
    {
        //则倒计时减一秒
        timelimit--;
        //显示倒计时文本
        ti