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Solución:
Para detener la sesión use este código
self.session.stopRunning()
Para comenzar de nuevo, use este código
self.session.startRunning()
Aquí está todo el código para implementar un escáner de código de barras …
import UIKit
import AVFoundation
class ViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate
let session : AVCaptureSession = AVCaptureSession()
var previewLayer : AVCaptureVideoPreviewLayer!
var highlightView : UIView = UIView()
override func viewDidLoad()
UIViewAutoresizing.FlexibleLeftMargin
// This is called when we find a known barcode type with the camera.
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()
self.alert(detectionString)
break
println(detectionString)
self.highlightView.frame = highlightViewRect
self.view.bringSubviewToFront(self.highlightView)
func alert(Code: String)
let actionSheet:UIAlertController =
UIAlertController(
title: "Barcode",
message: "(Code)",
preferredStyle: UIAlertControllerStyle.Alert)
// for alert add .Alert instead of .Action Sheet
// start copy
let firstAlertAction:UIAlertAction =
UIAlertAction(
title: "OK",
style: UIAlertActionStyle.Default,
handler: (alertAction: UIAlertAction!) in
// action when pressed
self.session.startRunning()
)
actionSheet.addAction(firstAlertAction)
// end copy
self.presentViewController(actionSheet, animated: true, completion: nil)
editó el código anterior para swift 2.0:
import UIKit
import AVFoundation
class BarCodeViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate
let session : AVCaptureSession = AVCaptureSession()
var previewLayer : AVCaptureVideoPreviewLayer!
@IBOutlet weak var highlightView: UIView!
override func viewDidLoad()
super.viewDidLoad()
// 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.view.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
var input: AVCaptureDeviceInput = AVCaptureDeviceInput()
do
input = try AVCaptureDeviceInput(device: device) as AVCaptureDeviceInput
catch let myJSONError
print(myJSONError)
// If our input is not nil then add it to the session, otherwise we're kind of done!
if input != AVCaptureDeviceInput()
session.addInput(input)
else
// This is fine for a demo, do something real with this in your app. :)
print(error)
let output = AVCaptureMetadataOutput()
output.setMetadataObjectsDelegate(self, queue: dispatch_get_main_queue())
session.addOutput(output)
output.metadataObjectTypes = output.availableMetadataObjectTypes
previewLayer = AVCaptureVideoPreviewLayer(session: session)
previewLayer.frame = self.view.bounds
previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
self.view.layer.addSublayer(previewLayer)
// Start the scanner. You'll have to end it yourself later.
session.startRunning()
// This is called when we find a known barcode type with the camera.
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()
self.alert(detectionString)
break
print(detectionString)
self.highlightView.frame = highlightViewRect
self.view.bringSubviewToFront(self.highlightView)
func alert(Code: String)
let actionSheet:UIAlertController = UIAlertController(title: "Barcode", message: "(Code)", preferredStyle: UIAlertControllerStyle.Alert)
// for alert add .Alert instead of .Action Sheet
// start copy
let firstAlertAction:UIAlertAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler:
(alertAction:UIAlertAction!) in
// action when pressed
self.session.startRunning()
)
actionSheet.addAction(firstAlertAction)
// end copy
self.presentViewController(actionSheet, animated: true, completion: nil)
Rápido 3,0 versión:
import UIKit
import AVFoundation
class BarCodeViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate
let session : AVCaptureSession = AVCaptureSession()
var previewLayer : AVCaptureVideoPreviewLayer!
@IBOutlet weak var highlightView: UIView!
override func viewDidLoad()
super.viewDidLoad()
self.highlightView.layer.borderColor = UIColor.green.cgColor
self.highlightView.layer.borderWidth = 3
// Add it to our controller's view as a subview.
self.view.addSubview(self.highlightView)
// For the sake of discussion this is the camera
let device = AVCaptureDevice.defaultDevice(withMediaType: 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
var input: AVCaptureDeviceInput = AVCaptureDeviceInput()
do
input = try AVCaptureDeviceInput(device: device) as AVCaptureDeviceInput
catch let myJSONError
print(myJSONError)
// If our input is not nil then add it to the session, otherwise we're kind of done!
if input != AVCaptureDeviceInput()
session.addInput(input)
else
// This is fine for a demo, do something real with this in your app. :)
print(error!)
let output = AVCaptureMetadataOutput()
output.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
session.addOutput(output)
output.metadataObjectTypes = output.availableMetadataObjectTypes
previewLayer = AVCaptureVideoPreviewLayer(session: session)
previewLayer.frame = self.view.bounds
previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
self.view.layer.addSublayer(previewLayer)
// Start the scanner. You'll have to end it yourself later.
session.startRunning()
// This is called when we find a known barcode type with the camera.
@nonobjc func captureOutput(
captureOutput: AVCaptureOutput!,
didOutputMetadataObjects metadataObjects: [AnyObject]!,
fromConnection connection: AVCaptureConnection!)
var highlightViewRect = CGRect()
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.transformedMetadataObject(for: metadata as! AVMetadataMachineReadableCodeObject)
highlightViewRect = barCodeObject.bounds
detectionString = (metadata as! AVMetadataMachineReadableCodeObject).stringValue
self.session.stopRunning()
self.alert(Code: detectionString)
break
print(detectionString)
self.highlightView.frame = highlightViewRect
self.view.bringSubview(toFront: self.highlightView)
func alert(Code: String)
let actionSheet:UIAlertController = UIAlertController(title: "Barcode", message: "(Code)", preferredStyle: UIAlertControllerStyle.alert)
// for alert add .Alert instead of .Action Sheet
// start copy
let firstAlertAction:UIAlertAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: (alertAction: UIAlertAction!) in
// action when pressed
self.session.startRunning()
)
actionSheet.addAction(firstAlertAction)
// end copy
self.present(actionSheet, animated: true, completion: nil)
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