GUI.changed

Description

Returns true if any controls changed the value of the input data.

    // Draws a text field and when it gets modified prints a message
    var stringToEdit : String = "Modify me.";

    function OnGUI () {
        // Make a text field that modifies stringToEdit.
        stringToEdit = GUI.TextField (Rect (10, 10, 200, 20), stringToEdit, 25);
        if (GUI.changed)
            Debug.Log("Text field has changed.");
    }

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public string stringToEdit = "Modify me.";
    void OnGUI() {
        stringToEdit = GUI.TextField(new Rect(10, 10, 200, 20), stringToEdit, 25);
        if (GUI.changed)
            Debug.Log("Text field has changed.");
        
    }
}