Converting all text to lower case in Objective-C

Question

I have a textfield in my iOS app where the user is supposed to input some text. But I was wondering if there is any way to convert the users input to lowercase letters.

Answer 1

Swift 3:

let upperCasedString = "UPPERCASED"

let lowerCasedString = upperCasedString.lowercased() 
//prints "uppercased"