How to do it...

To display an on/off UI Toggle to the user, follow these steps:

1. Create a new Unity 2D project.
2. In the Inspector, change the Background color of the Main Camera to white.
3. Add UI Toggle to the scene.
4. For the Label child of the Toggle GameObject, set the Text property to First Class.
5. Add an instance of the C# script class called ToggleChangeManager to the Toggle GameObject:

using UnityEngine; 
using UnityEngine.UI; 

public class ToggleChangeManager : MonoBehaviour { 
   private Toggle toggle; 

   void Awake () { 
         toggle = GetComponent<Toggle>();     
   } 

   public void PrintNewToggleValue() { 
         bool status = toggle.isOn; 
         print ("toggle status = " + status); 
   } 
} 

6. With the Toggle GameObject selected, add an On Value Changed event to the list of event handlers for the Toggle (Script) component, click on the plus (+) button to add an event-handler slot, and drag Toggle into the Object slot.
7. From the Function drop-down menu, choose ToggleChangeManager and then choose the PrintNewToggleValue method.
8. Save and run the Scene. Each time you check or uncheck the Toggle GameObject, the On Value Changed event will fire, and you'll see a new text message printed into the Console window by our script, stating the new Boolean true/false value of the Toggle.