如何根据所述数组的长度重命名数组中的元素？ （在 Unity 检查器中）

Question

我正在尝试创建程序动画引擎。因为我使用叉积来计算 body 的方向，腿在数组中需要按特定顺序排列。

我想确保它对任何使用它的人来说都是直观的，所以理想情况下，我希望它根据数组的长度重命名检查器中的元素。

示例： ideal example

Answer 1

这种东西是通过实现一个CustomEditor or also a CustomPropertyDrawer

实现的

让我们举个例子说你的 class 看起来像

public class DynamicLegList : MonoBehaviour
{
    public LegStepper[] Legs;
}

然后你就可以实现你通过

展示的东西

// Since the UnityEditor namespace is completely stripped of during the build process 
// this should be placed in a folder called "Editor"
// or if using Assemblies this should be placed in a separate Assembly which
// is excluded from any platform except the UnityEditor itself
[CustomEditor(typeof(DynamicLegList))]
internal class DynamicLegListEditor : Editor
{
    private SerializedProperty legs;

    private void OnEnable()
    {
        legs = serializedObject.FindProperty(nameof(DynamicLegList.Legs));
    }

    private readonly Dictionary<int, Dictionary<int, string>> legNames = new Dictionary<int, Dictionary<int, string>>
    {
        {
            2, new Dictionary<int, string>()
            {
                {0, "RightLeg"},
                {1, "LeftLeg"},
            }
        },
        {
            4, new Dictionary<int, string>()
            {
                {0, "FrontRightLeg"},
                {1, "FrontLeftLeg"},
                {2, "BackRightLeg"},
                {3, "BackLeftLeg"}
            }
        }
    };


    private int count;

    public override void OnInspectorGUI()
    {
        DrawScriptField();

        serializedObject.Update();

        legs.isExpanded = EditorGUILayout.Foldout(legs.isExpanded, legs.displayName, true);
        if (legs.isExpanded)
        {
            EditorGUI.indentLevel++;
            {
                EditorGUI.BeginChangeCheck();
                {
                    count = EditorGUILayout.IntField("Size", legs.arraySize);
                }
                if (EditorGUI.EndChangeCheck())
                {
                    if (count == 1 || legNames.ContainsKey(count))
                    {
                        legs.arraySize = count;
                    }
                }

                if (legs.arraySize == 1)
                {
                    var leg = legs.GetArrayElementAtIndex(0);
                    EditorGUILayout.PropertyField(leg, new GUIContent("Leg"));
                }
                else
                {
                    if (legNames.TryGetValue(legs.arraySize, out var names))
                    {
                        for (var i = 0; i < legs.arraySize; i++)
                        {
                            var leg = legs.GetArrayElementAtIndex(i);
                            EditorGUILayout.PropertyField(leg, new GUIContent(names[i]));
                        }
                    }
                }
            }
            EditorGUI.indentLevel--;
        }

        serializedObject.ApplyModifiedProperties();
    }

    private void DrawScriptField()
    {
        EditorGUI.BeginDisabledGroup(true);
        {
            EditorGUILayout.ObjectField("Script", MonoScript.FromMonoBehaviour((DynamicLegList) target), typeof(DynamicLegList), false);
        }
        EditorGUI.EndDisabledGroup();
    }
}

结果：