Improved ToggleGroup for Unity GUI

BetterToggleGroup.cs

using System;
using UnityEngine;
using UnityEngine.UI;

// based on https://gist.github.com/jmbeach/78c3e46669db89628fce
public class BetterToggleGroup : ToggleGroup {

  public Action<Toggle> OnChange;
  
  protected override void Start() {
    base.Start();
    ManageListening(true);
  }

  private void ManageListening(bool listen) {
    
    int count = 0;
    foreach (Transform transformToggle in gameObject.transform) {
      count += 1;
      Toggle toggle = transformToggle.gameObject.GetComponent<Toggle>();
      if (listen) {
        toggle.onValueChanged.AddListener(OnTog);
      }
      else {
        toggle.onValueChanged.RemoveListener(OnTog);
      }
    }
    if (count == 0) {
      Debug.LogWarning("No Toggles found in Children. Is your scene set up correctly ?");
    }
  }
  
  private void OnTog(bool isSelected) {
    if (isSelected) {
      if (OnChange != null) {
        OnChange(FirstActiveToggle());
      }
    }
  }
  
  public Toggle FirstActiveToggle() {
    foreach (Toggle t in ActiveToggles()) {
      return t;
    }
    return null;
  }
}

minor changes.

• removed Linq.
• simplified delegate by using System.Action.
• fixed issue with Start() shadowing the base class's Start().