Behaviour.isActiveAndEnabled

Description

Reports whether a GameObject and its associated Behaviour is active and enabled.

A GameObject can be active or inactive. Similarly, a Behaviour can be enabled or disabled. If a GameObject is active and has an enabled behaviour then isActiveAndEnabled will return true. Otherwise false is returned.
Note: value is ReadOnly.
To determine whether GameObject is active, isActiveAndEnabled uses the equivalent of activeInHierarchy.

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class Example : MonoBehaviour
{
    public Image pauseMenu;

    public void Update()
    {
        //Checks if the GameObject and Image are active and enabled.
        if (pauseMenu.isActiveAndEnabled)
        {
            //If the Image is enabled, print "Enabled" in the console. Stops when the image or GameObject is disabled.
            Debug.Log("Enabled");
        }
    }
}