How to validate a credit card number in Objective-C?

Use the [Luhn validateString:] method or the NSString category method isValidCreditCardNumber. No special formatting is needed—just pass the card number as a string, as shown in the README code snippets.

ObjectiveLuhn vs SwiftLuhn: which should I use?

Use ObjectiveLuhn for Objective-C projects and SwiftLuhn for Swift projects. Both are by the same author, but SwiftLuhn is the native Swift port, offering better integration without bridging headaches.

How to detect credit card type with ObjectiveLuhn?

Call [Luhn typeFromString:] or use the NSString method creditCardType to get the card type, such as Visa or American Express, from the number. This is built-in and requires no extra setup.

Is ObjectiveLuhn compatible with Swift?

Yes, but it requires Objective-C bridging. You can import it in Swift, but for a seamless experience, consider using the Swift port, SwiftLuhn, which is specifically designed for Swift projects.

How to install ObjectiveLuhn using CocoaPods?

Add 'pod "ObjectiveLuhn"' to your Podfile, run pod install, and import the header. The README specifies running pod install before opening the workspace to avoid issues.

Does ObjectiveLuhn validate expiration dates or CVV?

No, ObjectiveLuhn only validates credit card numbers using the Luhn algorithm. You'll need to implement additional logic or use other libraries for expiration dates and CVV checks in your app.

Open-Awesome

ObjectiveLuhn

MITObjective-C

An Objective-C implementation of the Luhn algorithm for validating credit card numbers on iOS.

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128 stars21 forks0 contributors

What is ObjectiveLuhn?

ObjectiveLuhn is an Objective-C library that implements the Luhn algorithm to validate credit card numbers in iOS applications. It provides a simple, reliable way to check card details before processing payments, reducing errors in transaction workflows.

Target Audience

iOS developers building apps that handle credit card payments or require card number validation, such as e-commerce or financial applications.

Value Proposition

Developers choose ObjectiveLuhn for its minimal setup, single-method validation, and built-in card type detection, making it a lightweight alternative to more complex payment SDKs.

Overview

Luhn Credit Card Validation Algorithm

Use Cases

Best For

Validating credit card numbers in iOS payment forms
Detecting credit card types (Visa, Amex, etc.) from user input
Adding pre-transaction validation to e-commerce apps
Simplifying payment processing workflows in Objective-C projects
Unit testing credit card validation logic with predefined test numbers
Extending NSString with custom validation methods in iOS

Not Ideal For

Swift-only iOS projects without Objective-C bridging
Applications needing full payment processing with transaction handling
Cross-platform apps requiring validation on Android or web
Teams looking for a Swift-native validation library with modern tooling

Pros & Cons

Pros

Simple Validation

Validates credit card numbers with a single method call like [Luhn validateString:], requiring no special formatting, as demonstrated in the README examples.

Card Type Detection

Identifies credit card types such as Visa or Amex using methods like creditCardType, adding useful context for payment forms without extra dependencies.

NSString Convenience

Extends NSString with a category method isValidCreditCardNumber, enabling validation directly on strings without additional imports, simplifying code integration.

Test Suite Included

Comes with unit tests and valid credit card numbers from sources like PayPal, ensuring reliability and easy testing for payment workflows.

Cons

Objective-C Only

Written in Objective-C, which requires bridging for Swift projects and may not integrate smoothly with modern Swift codebases, limiting its appeal.

Basic Functionality

Only validates card numbers using the Luhn algorithm, lacking features for expiration dates, CVV checks, or real-time bank verification, as admitted by its minimalist focus.

Dependency on CocoaPods

Requires CocoaPods for installation, which might add complexity compared to Swift Package Manager, especially for Swift-focused projects.

Frequently Asked Questions

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