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了解

1. 单行高度:EditorGUIUtility.singleLineHeight
2. 获取 PropertyField 控件所需的高度:EditorGUI.GetPropertyHeight
3. 属性是否在Inspector窗口展开：SerializedProperty.isExpanded
4. 可重新排序列表类：ReorderableList
5. 绘制纯色矩形：EditorGUI.DrawRect

示例

使用版本：2021.3.6f1c1
此版本的Unity已经实现数组元素添加，移除，移动功能。

自定义类

[System.Serializable]
public class Test 
{public string name;public int age;
}

数据类

定义一个数组，数组元素为自定义类

using System.Collections.Generic;
using UnityEngine;
[CreateAssetMenu]
public class TestSO : ScriptableObject
{public List<Test> testList;
}

数据类文件默认显示如下

修改数据类显示

数据元素内容显示为一行

注意：不能使用自动布局api

using UnityEngine;
using UnityEditor;
[CustomPropertyDrawer(typeof(Test))]
public class TestDrawer : PropertyDrawer
{public override void OnGUI(Rect position, SerializedProperty property, GUIContent label){var spName = property.FindPropertyRelative("name");var spAge = property.FindPropertyRelative("age");var rect1 = position;var rect2 = position;var indentlevel = EditorGUI.indentLevel;var lableWidth = EditorGUIUtility.labelWidth;EditorGUI.indentLevel = 2;EditorGUIUtility.labelWidth = 60;rect1.width = position.width / 2;rect1.height = EditorGUIUtility.singleLineHeight;rect2.width = position.width / 2;rect2.height = EditorGUIUtility.singleLineHeight;rect2.x = position.width / 2+40;rect2.y = rect1.y;EditorGUI.PropertyField(rect1, spName, new GUIContent("名字"));EditorGUI.PropertyField(rect2, spAge, new GUIContent("年龄"));EditorGUI.indentLevel = indentlevel;EditorGUIUtility.labelWidth = lableWidth;//EditorGUI.DrawRect(rect1, Color.green);//EditorGUI.DrawRect(rect2, Color.gray);}//获取属性高度public override float GetPropertyHeight(SerializedProperty property, GUIContent label){return base.GetPropertyHeight(property, label);}
}

修改后显示效果如下图所示

TestList修改为指定名称；Element修改为指定名称

using UnityEngine;
using UnityEditor;
using UnityEditorInternal;
[CustomEditor(typeof(TestSO))]
public class TestSOEditor : Editor
{SerializedProperty sPTestList;ReorderableList arrayList;private void OnEnable(){sPTestList = serializedObject.FindProperty("testList");if (arrayList == null){arrayList = new ReorderableList(serializedObject, sPTestList, true, true, true, true);    //绘制HeaderarrayList.drawHeaderCallback += DrawHeader;//绘制数组元素arrayList.drawElementCallback += DrawElement;//获取数组的高度arrayList.elementHeightCallback += DrawElementHeight;}}void DrawHeader(Rect rect){EditorGUI.LabelField(rect, "测试列表");}void DrawElement(Rect rect, int index, bool isActive, bool isFocused){var element = sPTestList.GetArrayElementAtIndex(index);var arrowRect = rect;int indentLevel = EditorGUI.indentLevel;EditorGUI.indentLevel = 1;arrowRect.height = EditorGUIUtility.singleLineHeight;element.isExpanded = EditorGUI.Foldout(arrowRect, element.isExpanded, new GUIContent("元素" + index));EditorGUI.indentLevel = indentLevel;//EditorGUI.DrawRect(rect, Color.red);//EditorGUI.DrawRect(arrowRect, Color.blue);if (element.isExpanded){rect.y += arrowRect.height;EditorGUI.PropertyField(rect, element);}}float DrawElementHeight(int index){var element = sPTestList.GetArrayElementAtIndex(index);var height = EditorGUIUtility.singleLineHeight;//折叠箭头的高度   if (element.isExpanded)//如果元素展开 获取展开内容的高度和箭头的高度之和height += EditorGUI.GetPropertyHeight(element);return height;}public override void OnInspectorGUI(){serializedObject.Update();arrayList.DoLayoutList();serializedObject.ApplyModifiedProperties();}
}

修改后如下图所示

示例二

高度计算放在PropertyDrawer的OnGUI中

自定义类

显示折叠箭头，数据元素内容显示为一行，Element修改为指定名称

using UnityEngine;
using UnityEditor;
[CustomPropertyDrawer(typeof(Test))]
public class TestDrawer : PropertyDrawer
{public override void OnGUI(Rect position, SerializedProperty property, GUIContent label){var spName = property.FindPropertyRelative("name");var spAge = property.FindPropertyRelative("age");var rect0 = position;rect0.height = EditorGUIUtility.singleLineHeight;var indentlevel = EditorGUI.indentLevel;EditorGUI.indentLevel = 1;property.isExpanded = EditorGUI.Foldout(rect0, property.isExpanded, label);EditorGUI.indentLevel = indentlevel;if (property.isExpanded){var rect1 = position;var rect2 = position;indentlevel = EditorGUI.indentLevel;var lableWidth = EditorGUIUtility.labelWidth;EditorGUI.indentLevel = 2;EditorGUIUtility.labelWidth = 60;rect1.width = position.width / 2;rect1.height = EditorGUIUtility.singleLineHeight;rect1.y += EditorGUIUtility.singleLineHeight;rect2.width = position.width / 2;rect2.height = EditorGUIUtility.singleLineHeight;rect2.x = position.width / 2 + 40;rect2.y = rect1.y;EditorGUI.PropertyField(rect1, spName, new GUIContent("名字"));EditorGUI.PropertyField(rect2, spAge, new GUIContent("年龄"));EditorGUI.indentLevel = indentlevel;EditorGUIUtility.labelWidth = lableWidth;//EditorGUI.DrawRect(rect1, Color.green);//EditorGUI.DrawRect(rect2, Color.gray);}}public override float GetPropertyHeight(SerializedProperty property, GUIContent label){if (property.isExpanded)return EditorGUIUtility.singleLineHeight * 2;elsereturn EditorGUIUtility.singleLineHeight;}
}

数据类

TestList修改为指定名称

using UnityEngine;
using UnityEditor;
using UnityEditorInternal;
[CustomEditor(typeof(TestSO))]
public class TestSOEditor : Editor
{SerializedProperty sPTestList;ReorderableList arrayList;private void OnEnable(){sPTestList = serializedObject.FindProperty("testList");if (arrayList == null){arrayList = new ReorderableList(serializedObject, sPTestList, true, true, true, true);//绘制HeaderarrayList.drawHeaderCallback += DrawHeader;//绘制数组元素arrayList.drawElementCallback += DrawElement;//绘制元素高度arrayList.elementHeightCallback += DrawHeight;void DrawHeader(Rect rect){EditorGUI.LabelField(rect, "测试列表");}void DrawElement(Rect rect, int index, bool isActive, bool isFocused){//参数会传递给PropertyDrawer的OnGUI EditorGUI.PropertyField(rect, sPTestList.GetArrayElementAtIndex(index), new GUIContent("元素 " + index));}float DrawHeight(int index){return EditorGUI.GetPropertyHeight(sPTestList.GetArrayElementAtIndex(index));}}}public override void OnInspectorGUI(){serializedObject.Update();arrayList.DoLayoutList();serializedObject.ApplyModifiedProperties();}
}

参考

看完后理解列表的高度如何计算