DamageGage

//GameObject in attach
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI; 

public class GameManager : MonoBehaviour
{
    public GameObject arrowPrefab;
    float span = 1.0f;
    float delta = 0;
    GameObject hpImage;
    public Text objFinish;
    public Text txtScore;
    int iScore = 10;
    void Start()
    {
        this.hpImage = GameObject.Find("hpImage");
        txtScore.text = "Count 10";
        objFinish.text = "";
    }
    public void SetScore()
    {
        iScore -= 2;
        txtScore.text = "Count " + iScore.ToString();
    }
    public void GameOver()
    {
        objFinish.text = "GameOver";
        txtScore.text = "";
        Invoke("GameRestart", 3.2f);
    }
    public void GameRestart()
    {
        Scene activeScene = SceneManager.GetActiveScene();
        SceneManager.LoadScene(activeScene.name);
    }
    public void DecreaseHp()
    {
        this.hpImage.GetComponent().fillAmount -= 0.2f;
    }
    void Update()
    {
        this.delta += Time.deltaTime;
        if (this.delta > this.span)
        {
            this.delta = 0;
            GameObject go = Instantiate(arrowPrefab);
            int px = Random.Range(-6, 7);
            go.transform.position = new Vector3(px, 7, 0);
        }
    }
}
///////////////////////////////////
//Player in attach
using UnityEngine;
using UnityEngine.UI; 

public class PlayerController : MonoBehaviour
{
    public float speed = 10.0f;
    public Joystick joystick;
    private Rigidbody2D rb;
    public float boundX;
    GameManager gManager;
    public GameObject player;
    GameObject hpImage;
    public Slider slider;
    float maxHp;
    float nowHp;
    public GameObject[] lifeArray = new GameObject[5];
    private int lifePoint = 5;
    // Start is called before the first frame update
    void Start()
    {
        rb = GetComponent();
        gManager = GameObject.Find("GameObject").GetComponent();
        this.hpImage = GameObject.Find("hpImage");
        maxHp = 100f;
        nowHp = 100f;
        //スライダーの最大値の設定
        slider.maxValue = maxHp;
        //スライダーの現在値の設定
        slider.value = nowHp;
    }
    private void OnTriggerEnter2D(Collider2D coll)
    {
        if (coll.gameObject.tag == "arrow")
        {
       gManager.DecreaseHp();
       gManager.SetScore();
       slider.value -= 20f;
       lifeArray[lifePoint - 1].SetActive(false);
       lifePoint -= 1;
        }
     if (hpImage.GetComponent().fillAmount <= 0)
        {
         player.SetActive(false);
         gManager.GameOver();
        }
        if (slider.value <= 0)
      {
         player.SetActive(false);
        gManager.GameOver();
         slider.gameObject.SetActive(false);
        }
        if (lifePoint <= 0)
        {
          player.SetActive(false);
          gManager.GameOver();
           slider.gameObject.SetActive(false);
        }
    }
    void FixedUpdate()
    {
        var x = transform.position.x + Input.GetAxis("Horizontal") * Time.deltaTime * speed;
        if (joystick && Input.GetAxis("Horizontal") == 0)
        {
            x = transform.position.x + joystick.Horizontal * Time.deltaTime * speed;
        }
        x = Mathf.Clamp(x, -boundX, boundX);
        rb.MovePosition(new Vector2(x, transform.position.y));
    }
}
///////////////////////////////////////
//ArrowPrefab in attach
using UnityEngine;

public class Arrow : MonoBehaviour
{
    void Update()
    {
      transform.Translate(0, -0.01f, 0);
    // 画面外に出たらオブジェクトを破棄する
    if (transform.position.y < -5.0f)
    {
      Destroy(gameObject);
    }
  }
}