Luhn Algorithm

This is a port of the Luhn Algorithm, generally used for validating Credit Card details, to Objective-C (iOS).

Swift port can be found at https://github.com/MaxKramer/SwiftLuhn.

It's as simple as calling one single method; no special formatting is required.

You must run pod install before opening the Example Project's 'workspace.

Instructions

Import the header:

#import "Luhn.h"

Call the class method returning a BOOL as to whether the string is valid or not:

BOOL isValid = [Luhn validateString:@"some credit card number"];
    
if (isValid) {
    // process payment   
}
else {
    // alert user
}

Alternatively, you can use the NSString category (no additional imports required):

NSString *ccNumber = @"378282246310005";
BOOL isValid = [ccNumber isValidCreditCardNumber];

You can also get the type of the credit card i.e. Visa, Diners, Amex, etc:

OLCreditCardType cardType = [ccNumber creditCardType];
// or
OLCreditCardType cardType = [Luhn typeFromString:ccNumber];

If you come across any issues or have a feature request, please open an issue or find me on:

Name	Website	Reason
Paypal	http://www.paypalobjects.com/en_US/vhelp/paypalmanager_help/credit_card_numbers.htm	List of valid credit card numbers for the unit tests

Ayaka Nonaka for updating the Cocoapod spec and helping me with other aspects of the project!

This project is licensed under the MIT License.