バーコード読取 by AVFoundation

ViewController.swift

import UIKit
import AVFoundation

class BarcodeEncodingViewController: UIViewController {
    private let session = AVCaptureSession()
    private var prevLayer: AVCaptureVideoPreviewLayer!
    private var hView = UIView()

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.setupCapture()
    }

    private func setupCapture() {
        self.hView.autoresizingMask = [
            UIViewAutoresizing.FlexibleTopMargin
            , UIViewAutoresizing.FlexibleBottomMargin
            , UIViewAutoresizing.FlexibleLeftMargin
            , UIViewAutoresizing.FlexibleRightMargin
        ]
        self.hView.layer.borderColor = UIColor.greenColor().CGColor
        self.hView.layer.borderWidth = 3
        self.view.addSubview(self.hView)

        let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
        var input: AVCaptureDeviceInput?
        do {
            input = try AVCaptureDeviceInput(device: device)
            self.session.addInput(input)
        } catch {
            input = nil
        }
        
        let output = AVCaptureMetadataOutput()
        output.setMetadataObjectsDelegate(self, queue: dispatch_get_main_queue())
        self.session.addOutput(output)
        output.metadataObjectTypes = output.availableMetadataObjectTypes
        self.prevLayer = AVCaptureVideoPreviewLayer(session: self.session)
        self.prevLayer.frame = self.view.bounds
        self.prevLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
        self.view.layer.addSublayer(self.prevLayer)
        
        session.startRunning()//開始！
    }
}

extension BarcodeEncodingViewController: AVCaptureMetadataOutputObjectsDelegate {
    func captureOutput(captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [AnyObject]!, fromConnection connection: AVCaptureConnection!) {
        var highlightViewRect = CGRectZero
        var barCodeObject : AVMetadataObject!
        var detectionString : String!
        
        //対応バーコードタイプ
        let barCodeTypes = [
            AVMetadataObjectTypeUPCECode,
            AVMetadataObjectTypeCode39Code,
            AVMetadataObjectTypeCode39Mod43Code,
            AVMetadataObjectTypeEAN13Code,
            AVMetadataObjectTypeEAN8Code,
            AVMetadataObjectTypeCode93Code,
            AVMetadataObjectTypeCode128Code,
            AVMetadataObjectTypePDF417Code,
            AVMetadataObjectTypeQRCode,
            AVMetadataObjectTypeAztecCode
        ]
        
        //複数のバーコードの同時取得も可能
        for metadata in metadataObjects {
            for barcodeType in barCodeTypes {
                if metadata.type == barcodeType {
                    barCodeObject = self.prevLayer.transformedMetadataObjectForMetadataObject(metadata as! AVMetadataMachineReadableCodeObject)
                    highlightViewRect = barCodeObject.bounds
                    detectionString = (metadata as! AVMetadataMachineReadableCodeObject).stringValue
                    self.session.stopRunning()
                    break
                }
            }
        }
        
        print(detectionString)
        self.prevLayer.frame = highlightViewRect
        self.view.bringSubviewToFront(self.hView)
    }
}