gistfile1.txt

//
//  BarcodeViewController.m
//  HSTestApp
//
//  Created by McLeod, Aaron on 2014-08-14.
//  Copyright (c) 2014 McLeod, Aaron. All rights reserved.
//

#import "BarcodeViewController.h"
#import "HTMLViewHelper.h"

@interface BarcodeViewController ()

@end

@implementation BarcodeViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    HTMLViewHelper *htmlViewHelper = [[HTMLViewHelper alloc] init];
    [_webView loadRequest:[NSURLRequest requestWithURL:[htmlViewHelper htmlFilePathFor:@"barcode"]]];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma AVCapture delegates

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
    AVMetadataMachineReadableCodeObject *barCodeObject;
    NSString *detectionString = nil;
    NSArray *barCodeTypes = @[AVMetadataObjectTypeUPCECode, AVMetadataObjectTypeCode39Code, AVMetadataObjectTypeCode39Mod43Code,
                              AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode93Code, AVMetadataObjectTypeCode128Code,
                              AVMetadataObjectTypePDF417Code, AVMetadataObjectTypeQRCode, AVMetadataObjectTypeAztecCode];
    
    for (AVMetadataObject *metadata in metadataObjects) {
        for (NSString *type in barCodeTypes) {
            if ([metadata.type isEqualToString:type]) {
                barCodeObject = (AVMetadataMachineReadableCodeObject *)[_prevLayer transformedMetadataObjectForMetadataObject:(AVMetadataMachineReadableCodeObject *)metadata];
                detectionString = [(AVMetadataMachineReadableCodeObject *)metadata stringValue];
                break;
            }
        }
    }
    
    if (detectionString != nil) {
        [_session stopRunning];
        [_prevLayer removeFromSuperlayer];
        [_webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"setBarcodeLabel('%@')", detectionString]];
    }
}

- (void)scanBarCode
{
    _session = [[AVCaptureSession alloc] init];
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    
    NSError *error = nil;
    
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
    if (input) {
        [_session addInput:input];
    }
    else {
        NSLog(@"Error: %@", error);
    }
    
    AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
    [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    [_session addOutput:output];
    
    output.metadataObjectTypes = [output availableMetadataObjectTypes];
    
    _prevLayer = [AVCaptureVideoPreviewLayer layerWithSession:_session];
    _prevLayer.frame = self.view.bounds;
    _prevLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
    [self.view.layer addSublayer:_prevLayer];
    
    [_session startRunning];
}

#pragma UIWebView delegates

- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType
{
    NSURL *requestURL = [request URL];
    
    if ([[requestURL scheme] isEqualToString:@"callback"]) {
        if ([[requestURL path] isEqualToString:@"/scan"]) {
            [self scanBarCode];
            return NO;
        }
        else if ([[requestURL path] isEqualToString:@"/next"]) {
            [self performSegueWithIdentifier:@"toFinish" sender:self];
            return NO;
        }
    }
    
    return YES;
}

@end