Toggle.onValueChanged

Description

Callback executed when the value of the toggle is changed.

Use this to detect when a user activates or deactivates the Toggle. Add a listener to perform an action when this Event detects a change in the Toggle state. See the delegates tutorial for more information on delegates.

//Attach this script to a Toggle GameObject. To do this, go to Create>UI>Toggle.
//Set your own Text in the Inspector window

using UnityEngine;
using UnityEngine.UI;

public class Example : MonoBehaviour
{
    Toggle m_Toggle;
    public Text m_Text;

    void Start()
    {
        //Fetch the Toggle GameObject
        m_Toggle = GetComponent<Toggle>();
        //Add listener for when the state of the Toggle changes, to take action
        m_Toggle.onValueChanged.AddListener(delegate {
                ToggleValueChanged(m_Toggle);
            });

        //Initialise the Text to say the first state of the Toggle
        m_Text.text = "First Value : " + m_Toggle.isOn;
    }

    //Output the new state of the Toggle into Text
    void ToggleValueChanged(Toggle change)
    {
        m_Text.text =  "New Value : " + m_Toggle.isOn;
    }
}