ZXingObjC is a full Objective-C port of ZXing ("Zebra Crossing"), a Java barcode image processing library. It is designed to be used on both iOS devices and in Mac applications.

The following barcodes are currently supported for both encoding and decoding:

• UPC-A and UPC-E
• EAN-8 and EAN-13
• Code 39
• Code 93 (not implemented yet)
• Code 128
• ITF
• Codabar
• RSS-14 (all variants)
• QR Code
• Data Matrix
• Aztec ('beta' quality)
• PDF 417 ('alpha' quality)

ZXingObjC currently has feature parity with ZXing version 3.0.

Sorry, this project had some sort of winter sleep for a long time. There were also some ideas to rewrite this project in Swift. Instead of rewriting the project in Swift as a whole, we planned to keep up feature parity with zxing-core at first, then rewrite the capture module as well as the examples in Swift. From this new starting point, we are going to replace classes step-by-step with new Swift implementations. We do not want to create a new barcode scanner but to keep the code as similar as possible to zxing-core.

ZXingObjC requires Xcode 8.3.3, targeting either iOS 8.0 and above, or Mac OS X 10.8 Mountain Lion and above.

Encoding:

NSError *error = nil;
ZXMultiFormatWriter *writer = [ZXMultiFormatWriter writer];
ZXBitMatrix* result = [writer encode:@"A string to encode"
 format:kBarcodeFormatQRCode
 width:500
 height:500
 error:&error];
if (result) {
 CGImageRef image = [[ZXImage imageWithMatrix:result] cgimage];
 // This CGImageRef image can be placed in a UIImage, NSImage, or written to a file.
} else {
 NSString *errorMessage = [error localizedDescription];
}

Decoding:

CGImageRef imageToDecode; // Given a CGImage in which we are looking for barcodes
ZXLuminanceSource *source = [[[ZXCGImageLuminanceSource alloc] initWithCGImage:imageToDecode] autorelease];
ZXBinaryBitmap *bitmap = [ZXBinaryBitmap binaryBitmapWithBinarizer:[ZXHybridBinarizer binarizerWithSource:source]];
NSError *error = nil;
// There are a number of hints we can give to the reader, including
// possible formats, allowed lengths, and the string encoding.
ZXDecodeHints *hints = [ZXDecodeHints hints];
ZXMultiFormatReader *reader = [ZXMultiFormatReader reader];
ZXResult *result = [reader decode:bitmap
 hints:hints
 error:&error];
if (result) {
 // The coded result as a string. The raw data can be accessed with
 // result.rawBytes and result.length.
 NSString *contents = result.text;
 // The barcode format, such as a QR code or UPC-A
 ZXBarcodeFormat format = result.barcodeFormat;
} else {
 // Use error to determine why we didn't get a result, such as a barcode
 // not being found, an invalid checksum, or a format inconsistency.
}

We highly recommend Carthage as module manager.

Alternatively, ZXingObjC can be installed using Carthage. After installing Carthage just add ZXingObjC to your Cartfile:

github "TheLevelUp/ZXingObjC" ~> 3.2.1

The recommended way to install ZXingObjC is with CocoaPods, a dependency mananger for Objective-C projects. After installing CocoaPods just add ZXingObjC to your Podfile:

platform :ios, '7.0'
pod 'ZXingObjC', '~> 3.2.1'

ZXingObjC includes several example applications found in "examples" folder:

• BarcodeScanner - An iOS application that captures video from the camera, scans for barcodes and displays results on screen.
• BarcodeScannerOSX - An OS X application that captures video from the camera, scans for barcodes and displays results on screen.
• QrCodeTest - A basic QR code generator that accepts input, encodes it as a QR code, and displays it on screen.

ZXingObjC is available under the Apache 2.0 license.