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

public class TestStopCoroutine : MonoBehaviour {

  IEnumerator co = null;

  void Start() {
    co = FunA();
    Invoke("OnCancelButtonClick", 2f);
    StartCoroutine(co);
  }

  private IEnumerator FunA() {
    Debug.Log("Enter FunA...");
    yield return FunB();
    Debug.Log("FunA end...");
  }

  private IEnumerator FunB()
  {
    Debug.Log("Enter FunB...");
    yield return FunC();
    Debug.Log("FunB end...");
  }

  private IEnumerator FunC() {
    Debug.Log("Enter FunC...");
    yield return RepeatPrint();
    Debug.Log("FunC end...");
  }

  private IEnumerator RepeatPrint() {
    for (int i = 0; i < 5; i++) {
      Debug.Log(i);
      yield return new WaitForSeconds(1);
    }
  }

  /// <summary>
  /// Set this function to a button on UI Canvas
  /// </summary>
  public void OnCancelButtonClick() {
    if (co != null) {
      StopCoroutine(co);
      Debug.Log("Stop Coroutine...");
      co = null;
    }
  }
}