單擊按鈕更改數據

Question

我在某些GameObjects中具有一些功能。 在游戲中購買升級時，需要更改這些功能。 問題在於每個功能都設置在其自己的對象上。

第一個問題是，當我單擊按鈕時，變量不會更改。 如您所見，我已經向按鈕添加了onclick值，說明單擊按鈕時。 該值應更改。

這里的問題是“對象引用未設置為實例”

我面臨的第二個問題是每個彈丸都是獨立發射的。 因此，如果我將靜態傷害更改為1，它將不會轉移到其他彈丸上。

升級菜單

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

public class UpgradeMenu : MonoBehaviour
{
    [SerializeField]
    private Text accuracyText;

    [SerializeField]
    private Text speedText;

    [SerializeField]
    private Text damageText;

    [SerializeField]
    private float accuracyMultiplier = 0.7f;

    private Weapon weapon;
    private Projectile projectile;
    private Player player;

    void OnEnable()
    {
        UpdateValues();
    }

    void UpdateValues ()
    {
      accuracyText.text = weapon.randomAngle.ToString();
      damageText.text = projectile.DamageOnHit.ToString();
      speedText.text = player.MaxRun.ToString();

    }

    public void UpgradeAccuracy ()
    {
      weapon.randomAngle = (int)weapon.randomAngle * accuracyMultiplier;
      UpdateValues();
    }

    public void UpgradeDamage ()
    {
      projectile.DamageOnHit = (int)projectile.DamageOnHit + 1;
      UpdateValues();
    }
}

彈丸（DamageScript）

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

//[RequireComponent (typeof(Rigidbody2D))]
public class Projectile : MonoBehaviour {

    [Header ("Speed")]
    public float baseSpeed;
    public float randomSpeed;
    public Vector2 SpeedV2;
    public Vector2 Direction;

    [Header ("Damage")]
    public int DamageOnHit;

    [Header ("Layers")]
    public LayerMask solid_layer;
    public LayerMask entities_layer;

    [Header ("OnHit FX")]
    public GameObject HitFxPrefab;
    public GameObject DustFxPrefab;

    [Header ("Bounce")]
    public bool BounceOnCollide = false;
    public int bouncesLeft = 0;

    [HideInInspector]
    public Health owner; // owner of the projectile
    private Vector2 Position; // Current position
    private Vector2 movementCounter = Vector2.zero;  // Counter for subpixel movement
    public BoxCollider2D myCollider; 
    List<Health> healthsDamaged = new List<Health>(); // List to store healths damaged

    void OnCollideWith (Collider2D col, bool horizontalCol = true) {
        var component = col.GetComponent<Health> ();
        // If the target the hitbox collided with has a health component and it is not our owner and it is not on the already on the list of healths damaged by the current hitbox
        if (component != null && component != owner && !healthsDamaged.Contains(component)) {
            // Add the health component to the list of damaged healths
            healthsDamaged.Add (component);

            // Apply the damage
            var didDamage = component.TakeDamage (DamageOnHit);
            // Destroy the projectile after applying damage
            if (didDamage) {
                DestroyMe ();
                return;
            }
        }

        // if the projectile hit's a solid object, destroy it
        if (col.gameObject.layer ==  (int)Mathf.Log(solid_layer.value, 2)) {
            DestroyMeWall ();
            return;
        }
    }

    void OnCollideWithEntity(Collider2D col) {
        var component = col.GetComponent<Health> ();
        // If the target the hitbox collided with has a health component and it is not our owner and it is not on the already on the list of healths damaged by the current hitbox
        if (component != null && component != owner && !healthsDamaged.Contains(component)) {
            // Add the health component to the list of damaged healths
            healthsDamaged.Add (component);

            // Apply the damage
            var didDamage = component.TakeDamage (DamageOnHit);
            // Destroy the projectile after applying damage
            if (didDamage) {
                DestroyMe ();
            }
        }
    }

Answer 1

首先，改變

[Header ("Damage")]
public int DamageOnHit;

靜態

public static int DamageOnHit = /*your starting value*/;

這樣可以確保所有彈丸在受到打擊時都受到相同的傷害。
例如，如果您當前在一個場景中有10個彈丸，而DamageOnHit為2，則它們都會造成2點傷害。

沒有static ，每個射彈將具有自己的DamageOnHit 。 這也將我們帶入下一個情況：

如果每個彈丸都有其自己的DamageOnHit ，並且我們要修改DamageOnHit ，則需要指定要修改的彈丸的傷害。
但是，如果它是靜態的，它將變得更加簡單，因為所有彈丸都共享相同的DamageOnHit 。

現在，如果您想更改所有彈丸的DamageOnHit ，只需執行

Projectile.DamageOnHit = /*Your new damage value*/

另外，由於您從未在UpgradeMenu分配projectile ，因此發生了null reference exception 。
（請注意，您在UpgradeMenu.cs從未使用過projectile = /*your projectile*/嗎？）

默認情況下，這將使變量為null。 並嘗試執行null.DamageOnHit += 1毫無意義。

小型修改：將變量設為靜態也將意味着您無法將其公開給檢查器。 但是您可以分配一個初始值，如最初顯示的代碼。