unity-editor-scripting

name	unity-editor-scripting
description	Unity Editor Scripting

Unity Editor Scripting

Use this skill when building custom inspectors, editor windows, property drawers, build pipeline extensions, or other tools using the UnityEditor API.

Undo System

Always use Undo for editor operations so users can Ctrl+Z:

// Record changes to existing object
Undo.RecordObject(transform, "Move Object");
transform.position = newPosition;

// Register newly created objects
var go = new GameObject("New Object");
Undo.RegisterCreatedObjectUndo(go, "Create Object");

// Register object destruction
Undo.DestroyObjectImmediate(gameObject);

// Group multiple operations into one undo step
Undo.SetCurrentGroupName("Complex Operation");
int group = Undo.GetCurrentGroup();
// ... multiple operations ...
Undo.CollapseUndoOperations(group);

// Register complete object state (for complex changes)
Undo.RegisterFullObjectHierarchyUndo(root, "Modify Hierarchy");

EditorPrefs and SessionState

// EditorPrefs — persists between editor sessions (stored in registry/plist)
EditorPrefs.SetString("MyTool_LastPath", path);
string lastPath = EditorPrefs.GetString("MyTool_LastPath", defaultValue: "Assets/");

// SessionState — persists only during current editor session
SessionState.SetBool("MyTool_ShowAdvanced", true);
bool showAdvanced = SessionState.GetBool("MyTool_ShowAdvanced", false);

Topic Pages

• Custom Inspector
• Build Pipeline