I can't fix size AVcapture with this code - ios

Question

I need to fix screen capture on horizontal But this my code can't fix size screen capture follow code > previewLayer.frame = CGRectMake(20, 40, 500, 100).
see on below this screen picture not match with CGRectMake(20, 40, 500, 100).
This is small size not match follow code(CGRectMake(20, 40, 500, 100))
please let my idea or example code for custom size this thank you.
This some code
import UIKit
import AVFoundation
protocol BarcodeDelegate {
func barcodeReaded(barcode: String)
}
class barcodeCapViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate {
var delegate: BarcodeDelegate?
var captureSession: AVCaptureSession!
var code: String?
override func viewDidLoad() {
super.viewDidLoad()
self.captureSession = AVCaptureSession();
let videoCaptureDevice: AVCaptureDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
do {
let videoInput = try AVCaptureDeviceInput(device: videoCaptureDevice)
if self.captureSession.canAddInput(videoInput) {
self.captureSession.addInput(videoInput)
} else {
print("Could not add video input")
}
let metadataOutput = AVCaptureMetadataOutput()
if self.captureSession.canAddOutput(metadataOutput) {
self.captureSession.addOutput(metadataOutput)
metadataOutput.setMetadataObjectsDelegate(self, queue: dispatch_get_main_queue())
metadataOutput.metadataObjectTypes = [AVMetadataObjectTypeQRCode, AVMetadataObjectTypeEAN13Code]
} else {
print("Could not add metadata output")
}
let previewLayer = AVCaptureVideoPreviewLayer(session: self.captureSession)
previewLayer.frame = CGRectMake(20, 40, 500, 100)
self.view.layer .addSublayer(previewLayer)
self.captureSession.startRunning()
} catch let error as NSError {
print("Error while creating vide input device: \(error.localizedDescription)")
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func captureOutput(captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [AnyObject]!, fromConnection connection: AVCaptureConnection!) {
for metadata in metadataObjects {
let readableObject = metadata as! AVMetadataMachineReadableCodeObject
let code = readableObject.stringValue
if !code.isEmpty {
self.captureSession.stopRunning()
self.dismissViewControllerAnimated(true, completion: nil)
self.delegate?.barcodeReaded(code)
}
}
}
}

Answer 1

Set the preview layer frame in viewDidAppear or in viewWillLayoutSubview