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

public class Gift : MonoBehaviour
{
    public GameObject giftPrefab;

    // アクセス修飾子は「public」にすること（重要）
    public IEnumerator Present()
    {
        for(int i = 0; i < 10; i++)
        {
            Instantiate(giftPrefab, transform.position, Quaternion.identity);

            yield return new WaitForSeconds(1.0f);
        }
    }
}

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

public class HumanHP : MonoBehaviour
{
    public GameObject effectPrefab;
    public AudioClip sound;
    private  int MaxHP = 3;
    private int HP;
    public Slider HPSlider;
    private GameObject[] targets;
    public GameObject effectPrefad2;

    // ★追加
    public GameObject gift;

    private void Start()
    {
        HP = MaxHP;
        HPSlider.maxValue = MaxHP;
        HPSlider.value = HP;
    }

    void OnCollisionEnter(Collision collision)
    {
        if (collision.gameObject.CompareTag("toge"))
        {
            GameObject effect = Instantiate(effectPrefab, collision.transform.transform.position, Quaternion.identity);
            Destroy(effect, 1.0f);
            AudioSource.PlayClipAtPoint(sound, Camera.main.transform.position);
            HP -= 1;
            HPSlider.value = HP;
            if (HP == 0)
            {
                targets = GameObject.FindGameObjectsWithTag("Hana");
                foreach(GameObject i in targets)
                {
                    Destroy(i);
                    GameObject effect2 = Instantiate(effectPrefad2, i.transform.position, Quaternion.identity);
                    Destroy(effect2, 3.0f);
                }

                Destroy(transform.root.gameObject);

                // ★追加
                // 別スクリプト内のコルーチンを作動させる。
                // 「名前」呼び出しなので、一言一句正確に記述する。
                gift.GetComponent<Gift>().StartCoroutine("Present");
            }
        }
    }
}