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84156698c4
NEEDS DESIGN - will likely have an intermediate "device manager" screen. * extracted QRCode Scanner into re-usable ViewController // FREEBIE
86 lines
3 KiB
Objective-C
86 lines
3 KiB
Objective-C
// Copyright © 2016 Open Whisper Systems. All rights reserved.
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#import "OWSQRCodeScanningViewController.h"
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#import "UIColor+OWS.h"
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@implementation OWSQRCodeScanningViewController
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- (void)viewDidLoad
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{
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[super viewDidLoad];
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self.title = NSLocalizedString(@"SCAN_KEY", @"");
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self.highlightView = [[UIView alloc] init];
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self.highlightView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleLeftMargin
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| UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleBottomMargin;
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self.highlightView.layer.borderColor = [UIColor ows_greenColor].CGColor;
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self.highlightView.layer.borderWidth = 4;
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[self.view addSubview:self.highlightView];
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self.session = [[AVCaptureSession alloc] init];
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self.device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
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NSError *error = nil;
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self.input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:&error];
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if (self.input) {
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[self.session addInput:self.input];
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} else {
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DDLogDebug(@"Error: %@", error);
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}
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self.output = [[AVCaptureMetadataOutput alloc] init];
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[self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
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[self.session addOutput:self.output];
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self.output.metadataObjectTypes = [self.output availableMetadataObjectTypes];
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self.prevLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.session];
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self.prevLayer.frame = self.view.bounds;
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self.prevLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
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[self.view.layer insertSublayer:self.prevLayer atIndex:0];
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[self.session startRunning];
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[self.view bringSubviewToFront:self.highlightView];
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}
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- (void)captureOutput:(AVCaptureOutput *)captureOutput
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didOutputMetadataObjects:(NSArray *)metadataObjects
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fromConnection:(AVCaptureConnection *)connection
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{
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CGRect highlightViewRect = CGRectZero;
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AVMetadataMachineReadableCodeObject *barCodeObject;
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NSString *detectionString = nil;
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NSArray *barCodeTypes = @[ AVMetadataObjectTypeQRCode ];
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for (AVMetadataObject *metadata in metadataObjects) {
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for (NSString *type in barCodeTypes) {
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if ([metadata.type isEqualToString:type]) {
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barCodeObject = (AVMetadataMachineReadableCodeObject *)[self.prevLayer
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transformedMetadataObjectForMetadataObject:(AVMetadataMachineReadableCodeObject *)metadata];
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highlightViewRect = barCodeObject.bounds;
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detectionString = [(AVMetadataMachineReadableCodeObject *)metadata stringValue];
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break;
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}
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}
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if (detectionString != nil) {
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[self didDetectQRCodeWithString:detectionString];
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[self.session stopRunning];
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break;
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}
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}
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self.highlightView.frame = highlightViewRect;
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}
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- (void)didDetectQRCodeWithString:(NSString *)string
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{
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// Override in subclass. Subclass is responsible for dismissing this view controller.
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DDLogInfo(@"Scanned QRCode with string value: %@", string);
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}
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@end
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