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

If you want to use a specific Locale when converting a string to lowercase, use lowercaseStringWithLocale (lowercased(with: Locale) in Swift 3+).

Objective-C

NSString *myString = @"Hello, World!";
NSLocale *locale = [NSLocale localeWithLocaleIdentifier:@"en_US"];
NSString *lower = [myString lowercaseStringWithLocale:locale];

Swift 3+

let myString = "Hello, World!"
let locale = Locale(identifier: "en_US")
let lower = myString.lowercased(with: locale)