title: How do we highlight or change the color of a button after it is pressed in swift Xcode 6?
body: <p>I am having a problem in Swift. I want to change the color of a button when I press it. I am actually making a Quiz in which there are four options and I want to change the color to red if the answer is wrong or change the color to green if the answer is correct. Can somebody help me out with this please?</p>