Unity Editor 编辑器拓展 09——Scene视图中编辑器拓展

Scene 视图添加

可以通过在自定义编辑器中实现 OnSceneGUI 来向 Scene 视图添加额外代码。

OnSceneGUI 的运行方式很像 OnInspectorGUI - 只不过在 Scene 视图中运行而已。为了方便在 Scene 视图中创建自己的编辑控件，可以使用在 Handles 类中定义的函数。其中的所有函数都是为 3D 模式的 Scene 视图设计的。

//C# 示例 (LookAtPointEditor.cs)
using UnityEngine;
using UnityEditor;

[CustomEditor(typeof(LookAtPoint))]
[CanEditMultipleObjects]
public class LookAtPointEditor : Editor
{
    SerializedProperty lookAtPoint;

    void OnEnable()
    {
        lookAtPoint = serializedObject.FindProperty("lookAtPoint");
    }

    public override void OnInspectorGUI()
    {
        serializedObject.Update();
        EditorGUILayout.PropertyField(lookAtPoint);
        if (lookAtPoint.vector3Value.y > (target as LookAtPoint).transform.position.y)
        {
            EditorGUILayout.LabelField("(Above this object)");
        }
        if (lookAtPoint.vector3Value.y < (target as LookAtPoint).transform.position.y)
        {
            EditorGUILayout.LabelField("(Below this object)");
        }
        
            
        serializedObject.ApplyModifiedProperties();
    }

    public void OnSceneGUI()
    {
        var t = (target as LookAtPoint);

        EditorGUI.BeginChangeCheck();
        Vector3 pos = Handles.PositionHandle(t.lookAtPoint, Quaternion.identity);
        if (EditorGUI.EndChangeCheck())
        {
            Undo.RecordObject(target, "Move point");
            t.lookAtPoint = pos;
            t.Update();
        }
    }
}

如果要放置 2D GUI 对象（GUI、EditorGUI 等等），需要将这些对象包裹在 Handles.BeginGUI() 和 Handles.EndGUI() 的调用中。

 

https://docs.unity.cn/cn/current/Manual/editor-CustomEditors.html