ZXingObjC

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
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.

Requirements

ZXingObjC requires Xcode 5, targeting either iOS 6.0 and above, or Mac OS X 10.8 Mountain Lion and above.

Usage

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.
}

Installation

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', '~> 3.0'

Examples

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.

License