倒計時

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
public class timer: MonoBehaviour
{
    public float timer = 3;//倒計時幾秒
    public GameObject t;//畫布下的文本框
    // Use this for initialization
    void Start()
    {
    }
    // Update is called once per frame
    void Update()
    {
        if (timer > 0)
        {
            timer -= Time.deltaTime;
            t.GetComponent<Text>().text = timer.ToString("00");//這個意思是取整數的意思，如果想取小數那麼就要ToString("0.0")
        }
        else GameOver();

    }
    void GameOver()
    {
        t.GetComponent<Text>().text = "Gameover";
    }
}