Version: 2017.3
public static List<Selectable> allSelectables ;

説明

シーン内で現在アクティブなすべての Selectable オブジェクトのリスト

UI.Selectable.allSelectables

using UnityEngine;
using System.Collections;
using UnityEngine.UI; // required when using UI elements in scripts

public class Example : MonoBehaviour { //Displays the names of all selectable elements in the scene public void GetNames() { foreach (Selectable selectableUI in Selectable.allSelectables) { Debug.Log(selectableUI.name); } } }