Unity3D中的ToggleGroup，哪个是active的？

ToggleGroup in Unity3D, which is the active one?

我们如何知道切换组中哪个切换处于活动状态？

Unity 文档说使用 ToggleGroup.ActiveToggles 但我不明白如何使用它？

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using System.Linq;
private void Example()
  {
  Toggle theActiveToggle = yourToggleGroup.ActiveToggles().FirstOrDefault();
  Debug.Log("It worked! " + theActiveToggle.gameObject.name);
  }