体力ゲージとダメージ処理※編集中

PlayerDamage.cs

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

public class PlayerDamage : MonoBehaviour
{
    public GameObject Explosion;
    public int hp = 5;
    Slider _slider;
    //private Renderer render;
    private bool damaged = false;
    public GameObject slider;

    // Use this for initialization
    void Start()
    {
        _slider=slider.GetComponent<Slider>();
    }

    // Update is called once per frame
    void Update()
    {
        _slider.value = hp;//スライダーとHPの紐づけ
    }


    void OnTriggerEnter(Collider collision)
    {
        //衝突した相手のタグがBall2で体力が0より大きいなら
        if (collision.gameObject.tag == "Ball2" && hp>0)
        {
            StartCoroutine("damage");
        }
        if (hp <= 0)
        {
            Instantiate(Explosion, new Vector3(transform.position.x, transform.position.y, transform.position.z), Quaternion.identity);
            Destroy(this.gameObject);
        }
    }

    IEnumerator damage()
    {
        if (damaged) yield break;
        damaged = true;
        hp -= 1;
        print(hp);
        //whileの中を8回繰り返す
        int count = 8;
        while (count > 0)
        {
            //render.material.color = new Color(1f, 0f, 0f, 0.5f);//ダメージを受けた時に半透明にしたかったら//を消す
            yield return new WaitForSeconds(0.05f);//0.05秒待つ
            //render.material.color = new Color(1f, 0f, 0f, 1f);//ダメージを受けた時に半透明にしたかったら//を消す

            count--;
        }
        damaged = false;
    }
}