Unity Editor 知识点整理（创建自定义 属性绘制器）

创建属性

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

//这个脚本 不放在 Editor下
namespace RunAndJump.LevelCreator
{
    
    
    //自定义的属性 需要继承PropertyAttribute 而不是MonoBehaviour
    public class TimeAttribute : PropertyAttribute
    {
    
    
        public readonly bool DisplayHours;

        public TimeAttribute(bool displayHours=false)
        {
    
    
            DisplayHours = displayHours;
        }
    }
}

创建属性绘制器 需放在Editor文件夹下

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

namespace RunAndJump.LevelCreator
{
    
    
    //绑定属性到属性绘制器
    [CustomPropertyDrawer(typeof(TimeAttribute))]
    public class TimeDrawer : PropertyDrawer//自定义的属性绘制器 需要继承PropertyDrawer
    {
    
    
        //定义属性绘制器 绘制的区域范围
        //属性绘制器不支持 EditorGUILayout
        //绘制高度
        public override float GetPropertyHeight(SerializedProperty property, GUIContent content)
        {
    
    
            return EditorGUI.GetPropertyHeight(property) * 2;
        }

        //具体的绘制GUI的操作
        public override void OnGUI(Rect position, SerializedProperty property, GUIContent content)
        {
    
    
            //判断属性绑定的变量类型
            //如果是绑定在int上
            if (property.propertyType == SerializedPropertyType.Integer)
            {
    
    
                property.intValue = EditorGUI.IntField(new Rect(position.x, position.y, position.width, position.height / 2), content, 
                    Mathf.Max(0, property.intValue));

                EditorGUI.LabelField(new Rect(position.x, position.y + position.height / 2, position.width, position.height / 2)
                    ,"",TimeConvert(property.intValue));
            }
            else//如果不是int，报错
            {
    
    
                EditorGUI.HelpBox(position,"使用Time属性"+content.text+"必须是int",MessageType.Error);
            }
        }

        private string TimeConvert(int totalSeconds)
        {
    
    
            //获取当前属性绘制器绑定的属性，在PropertyDrawer里的attribute提供了当前绑定的对象
            TimeAttribute time = attribute as TimeAttribute;
            if (time != null)
            {
    
    
                if (time.DisplayHours)
                {
    
    
                    int hours = totalSeconds / (60 * 60);
                    int minutes = (totalSeconds % (60 * 60)) / 60;
                    int seconds = totalSeconds % 60;
                    //padleft 占位符
                    return string.Format("{0}:{1}:{2}(h:m:s)",hours,minutes.ToString().PadLeft(2, '0'), seconds.ToString().PadLeft(2, '0'));
                }
                else
                {
    
    
                    int minutes = totalSeconds  / 60;
                    int seconds = totalSeconds % 60;
                    return string.Format("{0}:{1}(m:s)", minutes.ToString().PadLeft(2, '0'), seconds.ToString().PadLeft(2, '0'));

                }
            }
            else
            {
    
    
                return "time is null";
            }
        }
    }
}

最后创建测试脚本，并挂载对象上

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using RunAndJump.LevelCreator;

public class TimeDrawerDemo : MonoBehaviour
{
    
    
    //约定俗成的是 Attribute可以省略[TimeAttribute]
    [Time]
    public int TimeSeconds = 3600;

    [Time(true)]
    public int TimeShowHours= 3600;

    [Time]
    public float TimeShowError = 3600;
}

可以看到如下结果