I have a question about scan 1D barcode. Why I set the yellow border about scanning region view, only I put it in the middle of the region and get the result successfully?
It works fine when I put my 1D barcode in the green region by the following image. When I put the red region, and nothing happens. My app orientation only right and left.
What's wrong with my code?
import UIKit
import AVFoundation
class ViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate, UIAlertViewDelegate {
var scanRectView:UIView!
var device:AVCaptureDevice!
var input:AVCaptureDeviceInput!
var output:AVCaptureMetadataOutput!
var session:AVCaptureSession!
var preview:AVCaptureVideoPreviewLayer!
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidLayoutSubviews() {
self.configureVideoOrientation()
}
fileprivate func configureVideoOrientation() {
let previewLayer = self.preview
if let connection = previewLayer?.connection {
let orientation = UIDevice.current.orientation
if connection.isVideoOrientationSupported, let videoOrientation = AVCaptureVideoOrientation(rawValue: orientation.rawValue) {
previewLayer?.frame = self.view.bounds
connection.videoOrientation = videoOrientation
}
}
}
@IBAction func btnClicked(_ sender: Any) {
do{
self.device = AVCaptureDevice.default(for: AVMediaType.video)
self.input = try AVCaptureDeviceInput(device: device)
self.output = AVCaptureMetadataOutput()
output.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
self.session = AVCaptureSession()
if UIScreen.main.bounds.size.height < 500 {
self.session.sessionPreset = AVCaptureSession.Preset.vga640x480
}else{
self.session.sessionPreset = AVCaptureSession.Preset.high
}
self.session.addInput(self.input)
self.session.addOutput(self.output)
self.output.metadataObjectTypes = [.qr, .ean8, .ean13, .pdf417, .code128, .aztec, .code39, .code39Mod43, .code93, .dataMatrix, .face, .interleaved2of5, .itf14, .upce]
let windowSize = UIScreen.main.bounds.size
let scanSize = CGSize(width:windowSize.width*1/3, height:windowSize.width*1/3)
var scanRect = CGRect(x:(windowSize.width-scanSize.width)/2,
y:(windowSize.height-scanSize.height)/2,
width:scanSize.width, height:scanSize.height)
scanRect = CGRect(x:scanRect.origin.y/windowSize.height,
y:scanRect.origin.x/windowSize.width,
width:scanRect.size.height/windowSize.height,
height:scanRect.size.width/windowSize.width);
self.output.rectOfInterest = scanRect
self.preview = AVCaptureVideoPreviewLayer(session:self.session)
self.preview.videoGravity = AVLayerVideoGravity.resizeAspectFill
self.preview.frame = UIScreen.main.bounds
self.view.layer.insertSublayer(self.preview, at:0)
self.scanRectView = UIView();
self.view.addSubview(self.scanRectView)
self.scanRectView.frame = CGRect(x:0, y:0, width:scanSize.width,
height:scanSize.height);
self.scanRectView.center = CGPoint( x:UIScreen.main.bounds.midX,
y:UIScreen.main.bounds.midY)
self.scanRectView.layer.borderColor = UIColor.yellow.cgColor
self.scanRectView.layer.borderWidth = 5;
self.session.startRunning()
do {
try self.device!.lockForConfiguration()
} catch _ {
NSLog("Error: lockForConfiguration.");
}
self.device!.videoZoomFactor = 1.5
self.device!.unlockForConfiguration()
}catch _ {
}
}
func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
var stringValue:String?
if metadataObjects.count > 0 {
let metadataObject = metadataObjects[0] as! AVMetadataMachineReadableCodeObject
stringValue = metadataObject.stringValue
if stringValue != nil{
self.session.stopRunning()
}
}
self.session.stopRunning()
}
}
