Created
June 22, 2015 01:10
-
-
Save sjmueller/1ba0b5d5496b88a55327 to your computer and use it in GitHub Desktop.
Example of a custom react-native component, written in swift. Original author @euforic
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| // Barcode.swift | |
| import UIKit; | |
| import AVFoundation; | |
| @objc(BarcodeScanner) | |
| public class BarcodeScanner: UIView, AVCaptureMetadataOutputObjectsDelegate { | |
| let session : AVCaptureSession = AVCaptureSession() | |
| var previewLayer : AVCaptureVideoPreviewLayer! | |
| var highlightView : UIView = UIView() | |
| var bridge : RCTEventDispatcher! | |
| var enabled : Bool { | |
| set(newValue) { | |
| println("Setting isScanning to:", newValue) | |
| if newValue { | |
| self.startScanner(); | |
| return | |
| } | |
| self.stopScanner(); | |
| } | |
| get { | |
| return self.session.running; | |
| } | |
| } | |
| override init(frame: CGRect) { | |
| super.init(frame: frame) | |
| } | |
| required public init(coder aDecoder: NSCoder) { | |
| super.init(coder: aDecoder) | |
| } | |
| public func initWithEventDispatcher(bridge: RCTEventDispatcher) -> UIView { | |
| self.bridge = bridge; | |
| // Select the color you want for the completed scan reticle | |
| self.highlightView.layer.borderColor = UIColor.greenColor().CGColor | |
| self.highlightView.layer.borderWidth = 3 | |
| // Add it to our controller's view as a subview. | |
| self.addSubview(self.highlightView) | |
| // For the sake of discussion this is the camera | |
| let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo) | |
| // Create a nilable NSError to hand off to the next method. | |
| // Make sure to use the "var" keyword and not "let" | |
| var error : NSError? = nil | |
| let input : AVCaptureDeviceInput? = AVCaptureDeviceInput.deviceInputWithDevice(device, error: &error) as? AVCaptureDeviceInput | |
| // If our input is not nil then add it to the session, otherwise we're kind of done! | |
| if input != nil { | |
| session.addInput(input) | |
| } | |
| else { | |
| // This is fine for a demo, do something real with this in your app. :) | |
| println(error) | |
| } | |
| let output = AVCaptureMetadataOutput() | |
| output.setMetadataObjectsDelegate(self, queue: dispatch_get_main_queue()) | |
| session.addOutput(output) | |
| output.metadataObjectTypes = output.availableMetadataObjectTypes | |
| previewLayer = AVCaptureVideoPreviewLayer.layerWithSession(session) as! AVCaptureVideoPreviewLayer | |
| previewLayer.frame = self.bounds | |
| previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill | |
| self.layer.addSublayer(previewLayer) | |
| return self; | |
| } | |
| @objc public func startScanner() { | |
| if !self.session.running { | |
| self.session.startRunning(); | |
| } | |
| } | |
| @objc public func stopScanner() { | |
| if self.session.running { | |
| self.session.stopRunning(); | |
| } | |
| } | |
| override public func layoutSubviews() { | |
| self.previewLayer.frame = self.bounds | |
| if !self.session.running { | |
| self.session.startRunning() | |
| } | |
| } | |
| // This is called when we find a known barcode type with the camera. | |
| public func captureOutput(captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [AnyObject]!, fromConnection connection: AVCaptureConnection!) { | |
| var highlightViewRect = CGRectZero | |
| var barCodeObject : AVMetadataObject! | |
| var detectionString : String! | |
| let barCodeTypes = [AVMetadataObjectTypeUPCECode, | |
| AVMetadataObjectTypeCode39Code, | |
| AVMetadataObjectTypeCode39Mod43Code, | |
| AVMetadataObjectTypeEAN13Code, | |
| AVMetadataObjectTypeEAN8Code, | |
| AVMetadataObjectTypeCode93Code, | |
| AVMetadataObjectTypeCode128Code, | |
| AVMetadataObjectTypePDF417Code, | |
| AVMetadataObjectTypeQRCode, | |
| AVMetadataObjectTypeAztecCode | |
| ] | |
| // The scanner is capable of capturing multiple 2-dimensional barcodes in one scan. | |
| for metadata in metadataObjects { | |
| for barcodeType in barCodeTypes { | |
| if metadata.type == barcodeType { | |
| barCodeObject = self.previewLayer.transformedMetadataObjectForMetadataObject(metadata as! AVMetadataMachineReadableCodeObject) | |
| highlightViewRect = barCodeObject.bounds | |
| detectionString = (metadata as! AVMetadataMachineReadableCodeObject).stringValue | |
| self.session.stopRunning() | |
| break | |
| } | |
| } | |
| } | |
| if detectionString != nil { | |
| self.bridge.sendDeviceEventWithName("capture", body: detectionString); | |
| } | |
| self.highlightView.frame = highlightViewRect | |
| self.bringSubviewToFront(self.highlightView) | |
| } | |
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| // BarcodeViewManager.h | |
| #import "RCTViewManager.h" | |
| #import "RCTBridgeModule.h" | |
| @interface BarcodeScannerViewManager: RCTViewManager | |
| @end |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| // BarcodeViewManager.m | |
| #import "BarcodeScannerViewManager.h" | |
| #import "techtime-Swift.h" | |
| #import "RCTEventDispatcher.h" | |
| #import "RCTBridge.h" | |
| #import "RCTBridgeModule.h" | |
| @implementation BarcodeScannerViewManager | |
| @synthesize bridge = _bridge; | |
| RCT_EXPORT_MODULE(); | |
| - (UIView *)view { | |
| return [[[BarcodeScanner alloc] init ] initWithEventDispatcher:_bridge.eventDispatcher]; | |
| } | |
| RCT_EXPORT_VIEW_PROPERTY(enabled, BOOL); | |
| @end |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| // | |
| // Use this file to import your target's public headers that you would like to expose to Swift. | |
| // | |
| #import "RCTView.h" | |
| #import "RCTViewManager.h" | |
| #import "RCTBridge.h" | |
| #import "RCTEventDispatcher.h" | |
| #import "RCTUtils.h" | |
| #import "UIView+React.h" | |
| #import "RCTLog.h" |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment