为什么我的函数在 OnTriggerStay 中运行两次？

Question

I have a simple game in Unity .

The situation is like if I kill an enemy, it drops a pickupable Health. In the OnTriggerEnter , I handle the player collision with the health, and if the player misses health, it heals a certain amount. (70 exactly)

When player is standing on the health while at maximum health, it does nothing. But if player got damaged while standing on the health, the health should also be picked up, that is where OnTriggerStay comes in.

There I constantly check if the player needs heeling, if do, do the healing, and destroy the heal object. My problem is that it runs twice. It heals the amount twice to the player. No matter what I do, the function I call in OnTriggerStay is gonna run twice. Why is that? Anybody knows the solution?

Here is the part of my Player.cs file, and my Heal.cs file:

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

public class Player : MonoBehaviour
{
  //HP and MANA system
    [SerializeField]
    private int playerHealth;
    [SerializeField]
    private int playerMaxHealth = 100;
    [SerializeField]
    private Transform Healthbar;

    private void OnTriggerStay(Collider other)
    {
        if (other.tag == "Enemy")
        {
            timer += Time.deltaTime;
            if (timer > attackSpeed)
            {
                Enemy enemy = other.GetComponent<Enemy>();
                if (enemy != null)
                {
                    enemy.DamageEnemy(playerDamage);
                }
                timer = 0.0f;
            }
        }
        if (other.tag == "PatrollingEnemy")
        {
            timer += Time.deltaTime;
            if (timer > attackSpeed)
            {
                PatrollingEnemy enemy = other.GetComponent<PatrollingEnemy>();
                if (enemy != null)
                {
                    enemy.DamageEnemy(playerDamage);
                }
                timer = 0.0f;
            }
        }
        if (other.tag == "Heal")
        {
            heal(other, false);

        }
    }

    private void OnTriggerEnter(Collider other)
    {
        if (other.tag == "Heal")
        {
            heal(other, false);
        }
        else if (other.tag == "HealthPotion")
        {
            heal(other, true);
        }
    }
    private void heal(Collider other, bool isPotion)
    {

        dynamic heal;
        if (isPotion)
        {
            heal = other.GetComponent<HealthPotion>();
        }
        else
        {
            heal = other.GetComponent<Heal>();
        }
        if (playerHealth < playerMaxHealth && heal != null)
        {
            addHealthToPlayer(heal.HealAmount);
            Destroy(other.gameObject);
        }
    }

    private void addHealthToPlayer(int amount)
    {

        playerHealth += amount;
        if (playerHealth > playerMaxHealth)
        {
            playerHealth = playerMaxHealth;
        }
        rescaleHealthBar();
    }

    private void rescaleHealthBar()
    {
        Healthbar.transform.localScale = new Vector3((float)playerHealth / (float)playerMaxHealth, 1.0f, 1.0f);
    } 
}


public class Heal : MonoBehaviour
{
    float timer = 0.0f;
    float destroyTimer = 0.0f;
    float timeWhenDestroy = 15f;
    Vector3 rotation = new Vector3(0, 45, 0);

    private int healAmount = 70;
    public int HealAmount
    {
        get
        {
            return healAmount;
        }
    }

    void Update()
    {
        timer += Time.deltaTime;
        destroyTimer += Time.deltaTime;
        if (destroyTimer > timeWhenDestroy)
        {
            Destroy(this.gameObject);
        }
        transform.Rotate(rotation * Time.deltaTime);
        if (timer < 1.0f)
        {
            transform.Translate(Vector3.up * Time.deltaTime);
        }
        if (timer > 1.0f)
        {
            transform.Translate(-Vector3.up * Time.deltaTime);
        }
        if (timer > 2.0f)
        {
            timer = 0.0f;
        }
    }
}

Answer 1

https://docs.unity3d.com/ScriptReference/Object.Destroy.html

Maybe both your events (Enter & Stay) are fired during that frame ?

https://docs.unity3d.com/ScriptReference/Collider.OnTriggerStay.html

OnTriggerStay is called almost all the frames for every Collider other that is touching the trigger. The function is on the physics timer so it won't necessarily run every frame.