Post marked as solved
Post marked as solved with 15 replies, 13,069 views
Hi there team.I have this issue, it makes things a little slower in runnning conditionsi have a QR scannerfunc metadataOutput (_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
if metadataObjects != nil && metadataObjects.count != 0 {
if let object = metadataObjects[0] as? AVMetadataMachineReadableCodeObject {
if object.type == AVMetadataObject.ObjectType.qr {
//this is where the problem starts
let alert = UIAlertController(title: "Your code is:", message: object.stringValue, preferredStyle: .alert)
if object.stringValue == "1"{
self.performSegue(withIdentifier: "sendToAsistente", sender: nil)
}
else if object.stringValue == "2"{
self.performSegue(withIdentifier: "sendToExpositor", sender: nil)
}
else{
print("nada jeje")
}
alert.addAction(UIAlertAction(title: "Retake", style: .default, handler: nil))
alert.addAction(UIAlertAction(title: "Copy", style: .default, handler: { (nil) in
UIPasteboard.general.string = object.stringValue
}))
self.present(alert, animated: true, completion: nil)
}
}
}
}my Alert is making this issue happendet object = metadataObjects[0] as? AVMetadataMachineReadableCodeObject {
if object.type == AVMetadataObject.ObjectType.qr {
//this is where the problem starts
let alert = UIAlertController(title: "Your code is:", message: object.stringValue, preferredStyle: .alert)
if object.stringValue == "1"{
self.performSegue(withIdentifier: "sendToAsistente", sender: nil)
}
else if object.stringValue == "2"{
self.performSegue(withIdentifier: "sendToExpositor", sender: nil)
}
else{i have tried toDispatchQueue.main.async {
}but it didn't workif object.type == AVMetadataObject.ObjectType.qr {
let alert = UIAlertController(title: "Your code is:", message: object.stringValue, preferredStyle: .alert)
if object.stringValue == "1"{
DispatchQueue.main.async {
self.performSegue(withIdentifier: "sendToAsistente", sender: nil)
}
}
else if object.stringValue == "2"{
DispatchQueue.main.async {
self.performSegue(withIdentifier: "sendToExpositor", sender: nil)
}
}gives me this error :Warning: Attempt to present ContainerViewController: 0x145e4020> on ViewController: 0x146818b0> which is already presenting <UIAlertController: 0x14957a00>that's the error what i'm missing?whole codeimport UIKit
import AVFoundation
class RegistroViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate {
//
//
@IBOutlet weak var square: UIImageView!
var video = AVCaptureVideoPreviewLayer()
var alertController: UIAlertController?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
//Creating session
let session = AVCaptureSession()
//Define capture devcie
let defaultDevice = AVCaptureDevice.default(for: AVMediaType.video)
do
{
let input = try AVCaptureDeviceInput(device: defaultDevice!)
session.addInput(input)
}
catch
{
print ("ERROR")
}
let output = AVCaptureMetadataOutput()
session.addOutput(output)
output.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
output.metadataObjectTypes = [AVMetadataObject.ObjectType.qr]
video = AVCaptureVideoPreviewLayer(session: session)
video.frame = view.layer.bounds
view.layer.addSublayer(video)
self.view.bringSubviewToFront(square)
session.startRunning()
}
func metadataOutput (_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
if metadataObjects != nil && metadataObjects.count != 0 {
if let object = metadataObjects[0] as? AVMetadataMachineReadableCodeObject {
if object.type == AVMetadataObject.ObjectType.qr {
let alert = UIAlertController(title: "Your code is:", message: object.stringValue, preferredStyle: .alert)
if object.stringValue == "1"{
self.performSegue(withIdentifier: "sendToAsistente", sender: nil)
}
else if object.stringValue == "2"{
self.performSegue(withIdentifier: "sendToExpositor", sender: nil)
}
else{
print("nada jeje")
}
alert.addAction(UIAlertAction(title: "Retake", style: .default, handler: nil))
alert.addAction(UIAlertAction(title: "Copy", style: .default, handler: { (nil) in
UIPasteboard.general.string = object.stringValue
}))
self.present(alert, animated: true, completion: nil)
}
}
}
}
//laaaaaaassssstttt
}this is the errorWarning: Attempt to present <UIAlertController: 0x183c3a00> on <Conappeme.RegistroViewController: 0x17e7fc70> whose view is not in the window hierarchy!
Posted
by
Omar_Boca.
Last updated
Omar_Boca.
.