[游戏开发]按钮点一次 点两次做的事情

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

public class Layer3 : MonoBehaviour
{
public Button btn;

public Image line;

public Image pic;

private int index = 0;

// Start is called before the first frame update
void Start()
{
    
    btn.onClick.AddListener(OnClick);
}

// Update is called once per frame
void Update()
{
    
}

private void OnClick()
{
    index++;
    if (index%2==1)
    {
        StartCoroutine("StartDisplay");
    }
    else
    {
        StopCoroutine("StartDisplay");
        StopCoroutine("StartPlayCamera");

        line.fillAmount = 0.0f;
        pic.gameObject.SetActive(false);
    }
    
}

private IEnumerator StartDisplay()
{
    while (line.fillAmount<1.0f)
    {
        line.fillAmount += 0.1f;

        yield return new WaitForSeconds(0.03f);
    }

    StartCoroutine("StartPlayCamera");
}

private IEnumerator StartPlayCamera()
{
    yield return new WaitForSeconds(0.2f);
    pic.gameObject.SetActive(true);
}

private void OnDisable()
{
    if (pic.gameObject.activeSelf)
    {
        line.fillAmount = 0.0f;
        pic.gameObject.SetActive(false);
        index++;
    }
   
}

}