by maxkramer

maxkramer / ObjectiveLuhn

Luhn Credit Card Validation Algorithm

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Luhn Algorithm

Circle CI CocoaPods

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.


Import the header:

#import "Luhn.h"

Call the class method returning a

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:

Twitter: @maxkramer

Website: http://maxkramer.co


|Name|Website|Reason| |:---|:------|:-----| |Paypal|http://www.paypalobjects.com/enUS/vhelp/paypalmanagerhelp/creditcardnumbers.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!

Twitter: @ayanonagon


This project is licensed under the MIT License.

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