如何使用填充和文本重置计时器

问：

我得到了这个计时器的代码，它由填充和文本组成，因为我不想只看到数字递减，所以决定使用填充来使其更加醒目。它工作正常，但我希望计数器在达到 0 时重新启动。 我希望它是一个无限计数器，当场景运行时，当它达到 0 时，它会重新启动，而无需暂停并再次播放。尝试重新启动填充时出现问题

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

public class Timercountdown : MonoBehaviour
{
    [SerializeField] private Image uifill;
    [SerializeField] private Text uitext;
    public int Duration { get; private set; }

    private int remainingDuration;

    private void Awake()
    {
        ResetTimer() ;
    }
    private void ResetTimer()
    {
        uitext.text = "00:00";
        uifill.fillAmount = 0f;

        Duration = remainingDuration = 0;
    }

    public Timercountdown SetDuration(int seconds)
    {
        Duration = remainingDuration = seconds;

        return this;
    }

    public void Begin()
    {
        StopAllCoroutines();
        StartCoroutine(UpdateTimer());
    }

    private IEnumerator UpdateTimer()
    {
        while(remainingDuration > 0)
        {
            UpdateUI(remainingDuration);
            remainingDuration--;
            yield return new WaitForSeconds(1f);
        }
        End();
    }
    private void UpdateUI(int seconds)
    {
        uitext.text = string.Format("{00:00}:{01:00}", seconds/60 , seconds%60);
        uifill.fillAmount = Mathf.InverseLerp(0, Duration, seconds);   
    }

    public void End()
    {
        ResetTimer();
    }
    private void OnDestroy()
    {
        StopAllCoroutines();
    }

}

为了设置时间，使用一个小代码，调用前面代码的函数。

public class Demo : MonoBehaviour
{
    [SerializeField] Timercountdown timer1;
    // Start is called before the first frame update
    private void Start()
    {
        timer1.SetDuration(30).Begin();
    }

}