आईओएस स्विफ्ट बारकोड पढ़ना

Question

मेरे पास मेरे ऐप में बारकोड स्कैनिंग काम कर रहा है। बारकोड का पता लगाने के बाद मैं बारकोड की प्रसंस्करण की अनुमति देने के लिए कैप्चर सत्र को रोकता हूं। हालांकि, बारकोड संसाधित होने के बाद मैं स्कैनिंग नियंत्रक को रहना चाहता हूं और अगला बारकोड स्कैन किया गया है। मैंने माना था कि कैप्चर सत्र शुरू करना (startRunning()) ऐसा करेगा लेकिन छवि जमे हुए रहती है। मैं कैप्चर सत्र फिर से कैसे शुरू कर सकता हूं?

Answer 1

सत्र उपयोग इस कोड

  self.session.stopRunning() 

बंद करो करने के लिए यह फिर से शुरू करने के लिए इस कोड को

self.session.startRunning() 

यहाँ सब एक बारकोड स्कैनर लागू करने के लिए कोड है का उपयोग करें ...

import UIKit 
import AVFoundation 


class ViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate { 

    let session   : AVCaptureSession = AVCaptureSession() 
    var previewLayer : AVCaptureVideoPreviewLayer! 
    var highlightView : UIView = UIView() 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     // Allow the view to resize freely 
     self.highlightView.autoresizingMask = UIViewAutoresizing.FlexibleTopMargin | 
      UIViewAutoresizing.FlexibleBottomMargin | 
      UIViewAutoresizing.FlexibleLeftMargin | 
      UIViewAutoresizing.FlexibleRightMargin 

     // 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 


     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.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 
       } 

      } 
     } 

     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) 

    } 



} 

Answer 2

स्विफ्ट 2.0:

के लिए उपरोक्त कोड संपादित किया गया

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() 

     // Allow the view to resize freely 
//  self.highlightView.autoresizingMask = UIViewAutoresizing.FlexibleTopMargin | 
//   UIViewAutoresizing.FlexibleBottomMargin | 
//   UIViewAutoresizing.FlexibleLeftMargin | 
//   UIViewAutoresizing.FlexibleRightMargin 
//   
     // 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) 

    } 



} 

Answer 3

स्विफ्ट 3.0 संस्करण:

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() 

    // Allow the view to resize freely 
    //  self.highlightView.autoresizingMask = UIViewAutoresizing.FlexibleTopMargin | 
    //   UIViewAutoresizing.FlexibleBottomMargin | 
    //   UIViewAutoresizing.FlexibleLeftMargin | 
    //   UIViewAutoresizing.FlexibleRightMargin 
    // 
    // Select the color you want for the completed scan reticle 
    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) 

} 

} तेज 3.0 में