Alex教程每一P的教程原代码加上我自己的理解初步理解写的注释，可供学习Alex教程的人参考
此代码仅为较上一P有所改变的代码

【Unity教程】从0编程制作类银河恶魔城游戏_哔哩哔哩_bilibili

UI.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class UI : MonoBehaviour
{[SerializeField] private GameObject characterUI;public UI_itemTooltip itemTooltip;public void Start(){itemTooltip = characterUI.GetComponentInChildren<UI_itemTooltip>();}public void SwitchTo(GameObject _menu){for(int i = 0;i < transform.childCount;i++){transform.GetChild(i).gameObject.SetActive(false);}if(_menu != null){_menu.SetActive(true);}}
}

UI_itemTooltip.cs

using System.Collections;
using System.Collections.Generic;
using TMPro;
using UnityEngine;public class UI_itemTooltip : MonoBehaviour
{[SerializeField] private TextMeshProUGUI itemNameText;[SerializeField] private TextMeshProUGUI itemTypeText;[SerializeField] private TextMeshProUGUI itemDescription;[SerializeField] private int defaultFontSize = 32;public void ShowToolTip(ItemData_Equipment item)//将item里面的数据读取到对应的text上并显示此组件{if (item == null)return;itemNameText.text = item.itemName;itemTypeText.text = item.equipmentType.ToString();itemDescription.text = item.GetDescription();if (itemNameText.text.Length > 12)//使标题超过最大尺寸时字体缩小{itemNameText.fontSize = itemNameText.fontSize * .7f;}else{itemNameText.fontSize = defaultFontSize;}gameObject.SetActive(true);}public void HideToolTip()//关闭此组件{itemNameText.fontSize = defaultFontSize;//防止字体越来越小gameObject.SetActive(false);}
}

UI_itemSlot.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using TMPro;
using UnityEngine.EventSystems;public class UI_itemSlot : MonoBehaviour ,IPointerDownHandler, IPointerEnterHandler, IPointerExitHandler
{[SerializeField] private Image itemImage;[SerializeField] private TextMeshProUGUI itemText;private UI ui;public InventoryItem item;private void Start(){ui = GetComponentInParent<UI>();}public void UpdateSlots(InventoryItem _newItem){item = _newItem;itemImage.color = Color.white;if (item != null){itemImage.sprite = item.data.icon;if (item.stackSize > 1){itemText.text = item.stackSize.ToString();}else{itemText.text = "";}}}public void CleanUpSlot()//解决出现UI没有跟着Inventory变化的bug{item = null;itemImage.sprite = null;itemImage.color = Color.clear;itemText.text = "";}public virtual void OnPointerDown(PointerEventData eventData){if(item == null)//修复点击空白处会报错的bug{return;}if(Input.GetKey(KeyCode.LeftControl)){Inventory.instance.RemoveItem(item.data);return;}if (item.data.itemType == ItemType.Equipment)Inventory.instance.EquipItem(item.data);}public void OnPointerEnter(PointerEventData eventData){if (item == null || item.data == null)return;ui.itemTooltip.ShowToolTip(item.data as ItemData_Equipment);}public void OnPointerExit(PointerEventData eventData){if (item == null || item.data == null)return;ui.itemTooltip.HideToolTip();}
}

ItemData_equipment.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public enum EquipmentType
{Weapon,Armor,Amulet,Flask}[CreateAssetMenu(fileName = "New Item Data", menuName = "Data/Equipment")]
public class ItemData_Equipment : ItemData
{public EquipmentType equipmentType;public float itemCooldown;public ItemEffect[] itemEffects;[Header("Major stats")]public int strength; // 力量 增伤1点 爆伤增加 1% 物抗public int agility;// 敏捷 闪避 1% 闪避几率增加 1%public int intelligence;// 1 点 魔法伤害 1点魔抗 public int vitality;//加血的[Header("Offensive stats")]public int damage;public int critChance;      // 暴击率public int critPower;       //150% 爆伤[Header("Defensive stats")]public int health;public int armor;public int evasion;//闪避值public int magicResistance;[Header("Magic stats")]public int fireDamage;public int iceDamage;public int lightingDamage;[Header("Craft requirements")]public int descriptionLength;public void AddModifiers(){PlayerStats playerStats = PlayerManager.instance.player.GetComponent<PlayerStats>();playerStats.strength.AddModifier(strength);playerStats.agility.AddModifier(agility);playerStats.intelligence.AddModifier(intelligence);playerStats.vitality.AddModifier(vitality);playerStats.damage.AddModifier(damage);playerStats.critChance.AddModifier(critChance);playerStats.critPower.AddModifier(critPower);playerStats.Health.AddModifier(health);playerStats.armor.AddModifier(armor);playerStats.evasion.AddModifier(evasion);playerStats.magicResistance.AddModifier(magicResistance);playerStats.fireDamage.AddModifier(fireDamage);playerStats.iceDamage.AddModifier(iceDamage);playerStats.lightingDamage.AddModifier(lightingDamage);}public void RemoveModifiers(){PlayerStats playerStats = PlayerManager.instance.player.GetComponent<PlayerStats>();playerStats.strength.RemoveModifier(strength);playerStats.agility.RemoveModifier(agility);playerStats.intelligence.RemoveModifier(intelligence);playerStats.vitality.RemoveModifier(vitality);playerStats.damage.RemoveModifier(damage);playerStats.critChance.RemoveModifier(critChance);playerStats.critPower.RemoveModifier(critPower);playerStats.Health.RemoveModifier(health);playerStats.armor.RemoveModifier(armor);playerStats.evasion.RemoveModifier(evasion);playerStats.magicResistance.RemoveModifier(magicResistance);playerStats.fireDamage.RemoveModifier(fireDamage);playerStats.iceDamage.RemoveModifier(iceDamage);playerStats.lightingDamage.RemoveModifier(lightingDamage);}public void Effect(Transform _enemyPosition)//循环调用Effect类里的Effect的函数{foreach(var item in itemEffects){item.ExecuteEffect(_enemyPosition);}}public override string GetDescription()//让外界能够拿到拼出字符串的函数{sb.Length = 0;descriptionLength = 0;AddItemDescription(strength, "strength");AddItemDescription(agility, "agility");AddItemDescription(intelligence, "intelligence");AddItemDescription(vitality, "vitality");AddItemDescription(damage, "damage");AddItemDescription(critChance, "critChance");AddItemDescription(critPower, "critPower");AddItemDescription(health, "health");AddItemDescription(evasion, "evasion");AddItemDescription(armor, "armor");AddItemDescription(magicResistance, "magicResistance");AddItemDescription(fireDamage, "fireDamage");AddItemDescription(iceDamage, "iceDamage");AddItemDescription(lightingDamage, "lightingDamage");Debug.Log("In GetDescription");if(descriptionLength < 5)//使窗口拥有最小尺寸{for(int i = 0;i < 5- descriptionLength;i++){sb.AppendLine();sb.Append("");}}return sb.ToString();}private void AddItemDescription(int _value,string _name)//通过判断拼出想要的字符串的函数{if(_value != 0){Debug.Log(1);if(sb.Length >= 0)sb.AppendLine();//这是控制行数的if(_value > 0)sb.Append(" + "+_value + " " + _name);//这是实打实添加字符串的descriptionLength++;}}
}

ItemData.cs

using System.Collections;
using System.Collections.Generic;
using System.Text;
using UnityEngine;public enum ItemType
{Material,Equipment
}[CreateAssetMenu(fileName = "New Item Data", menuName = "Data/Item")]
public class ItemData : ScriptableObject 
{public ItemType itemType;public string itemName;public Sprite icon;//图标[Range(0,100)]public float dropChance;protected StringBuilder sb = new StringBuilder();public virtual string GetDescription(){return "";}
}