EditorGUILayout.ObjectField

static function ObjectField (obj : Object, objType : System.Type, allowSceneObjects : boolean, params options : GUILayoutOption[]) : Object

static function ObjectField (label : String, obj : Object, objType : System.Type, allowSceneObjects : boolean, params options : GUILayoutOption[]) : Object

static function ObjectField (label : GUIContent, obj : Object, objType : System.Type, allowSceneObjects : boolean, params options : GUILayoutOption[]) : Object

Parameters

Name	Description
label	Optional label in front of the field.
obj	The object the field shows.
objType	The type of the objects that can be assigned.
allowSceneObjects	Allow assigning scene objects. See Description for more info.
options	An optional list of layout options that specify extra layouting properties. Any values passed in here will override settings defined by the style. See Also: GUILayout.Width, GUILayout.Height, GUILayout.MinWidth, GUILayout.MaxWidth, GUILayout.MinHeight, GUILayout.MaxHeight, GUILayout.ExpandWidth, GUILayout.ExpandHeight

Returns

Object - The object that has been set by the user.

Description

Make an object field. You can assign objects either by drag'n drop objects or by selecting an object using the Object Picker.

Ensure that the allowSceneObjects parameter is false if the object reference is stored as part of an asset, since assets can't store references to objects in a scene.
If the ObjectField is part of a custom Editor for a script component, use EditorUtility.IsPersistent() to check if the component is on an asset or a scene object.
See example in Editor class.

Search for a help page by selecting the GameObject in the Object Field.

// EditorScript that quickly searchs for a help page
// of the selected Object.
//
// If there is no page found on the Manual it opens the Unity forum.

import UnityEditor;

class QuickHelper extends EditorWindow {

    var source : Object;

    @MenuItem("Example/QuickHelper _h")
    static function Init() {
        var window : QuickHelper = EditorWindow.GetWindowWithRect(QuickHelper, Rect(0,0,165,100));
        window.Show();
    }
    
    function OnGUI() {
        EditorGUILayout.BeginHorizontal();
        source = EditorGUILayout.ObjectField(source, Object);
        EditorGUILayout.EndHorizontal();
        
        if(GUILayout.Button("Search!")) {
            if(source == null) {
                this.ShowNotification(GUIContent("No object selected for searching"));
            } else {
                if(Help.HasHelpForObject(source))
                    Help.ShowHelpForObject(source);
                else
                    Help.BrowseURL("http://forum.unity3d.com/search.php");
            }
        }
    }
}