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私はバーコードスキャナを構築しています。操作は簡単です バーコードをスキャンすると バーコードが私のfirebaseデータベースにある場合はfunc updateProductInfo()バーコードがfirebaseデータベースにない場合はfunc enterNewProduct（）を実行します。 今私が抱えている問題の1つは、metadataObjを定義して、後で定義するすべての関数と他の関数からアクセスできるようにすることです。私はScanControllerクラスのすぐ下にそれを定義しようとしましたが、私はそれを理解できませんでした。私のコードは以下の通りです未解決の識別子の使用
import UIKit
import AVFoundation
import Firebase
class ScanController: UIViewController, AVCaptureMetadataOutputObjectsDelegate {
var captureSession: AVCaptureSession?
var videoPreviewLayer: AVCaptureVideoPreviewLayer?
var qrCodeFrameView: UIView?
let itemDB = FIRDatabase.database().reference().child("Items")
let supportedCodeTypes = [AVMetadataObjectTypeUPCECode,
AVMetadataObjectTypeCode39Code,
AVMetadataObjectTypeCode39Mod43Code,
AVMetadataObjectTypeCode93Code,
AVMetadataObjectTypeCode128Code,
AVMetadataObjectTypeEAN8Code,
AVMetadataObjectTypeEAN13Code,
AVMetadataObjectTypeAztecCode,
AVMetadataObjectTypePDF417Code,
AVMetadataObjectTypeQRCode]
let messageLabel: UILabel = {
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 40))
// label.center = CGPoint(x: 160, y: 285)
label.center = CGPoint(x: 160, y: 285)
label.textAlignment = .center
return label
}()
let productDescriptionTextField: UITextField = {
let tf = UITextField()
tf.placeholder = "Product Description"
tf.translatesAutoresizingMaskIntoConstraints = false
return tf
}()
let descriptionSeparatorView: UIView = {
let view = UIView()
view.backgroundColor = UIColor(r: 220, g: 220, b: 220)
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
let priceTextField: UITextField = {
let tf = UITextField()
tf.placeholder = "Price"
tf.translatesAutoresizingMaskIntoConstraints = false
return tf
}()
let priceSeparatorView: UIView = {
let view = UIView()
view.backgroundColor = UIColor(r: 220, g: 220, b: 220)
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
let productLocationTextField: UITextField = {
let tf = UITextField()
tf.placeholder = "Product Location"
tf.translatesAutoresizingMaskIntoConstraints = false
return tf
}()
let productImageView: UIImageView = {
let imageView = UIImageView()
imageView.image = UIImage(named: "XXXXXXX")
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.contentMode = .scaleAspectFill
return imageView
}()
let exitScanButton: UIButton = {
let button = UIButton(type: .system)
button.backgroundColor = UIColor(r: 80, g: 101, b: 161)
button.setTitle("Exit", for: .normal)
button.setTitleColor(UIColor.white, for: .normal)
button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 16)
button.translatesAutoresizingMaskIntoConstraints = false
button.addTarget(nil, action: #selector(exitScan), for:.touchUpInside)
return button
}()
let newProductEntry: UIView = {
let view = UIView()
view.backgroundColor = UIColor.white
view.translatesAutoresizingMaskIntoConstraints = false
view.layer.cornerRadius = 5
view.layer.masksToBounds = true
return view
}()
let productSummary: UIView = {
let view = UIView()
view.backgroundColor = UIColor.white
view.translatesAutoresizingMaskIntoConstraints = false
view.layer.cornerRadius = 5
view.layer.masksToBounds = true
return view
}()
let productDescriptionLabel: UILabel = {
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 40))
// label.center = CGPoint(x: 160, y: 285)
label.center = CGPoint(x: 160, y: 285)
label.textAlignment = .center
return label
}()
let storeNameLabel: UILabel = {
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 40))
// label.center = CGPoint(x: 160, y: 285)
label.center = CGPoint(x: 160, y: 285)
label.textAlignment = .center
return label
}()
let verifyProductInfoButton: UIButton = {
let button = UIButton(type: .system)
button.backgroundColor = UIColor(r: 80, g: 101, b: 161)
button.setTitle("Checked", for: .normal)
button.setTitleColor(UIColor.white, for: .normal)
button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 16)
button.translatesAutoresizingMaskIntoConstraints = false
button.addTarget(nil, action: #selector(verifyNewProduct), for:.touchUpInside)
return button
}()
let updateProductInfoButton: UIButton = {
let button = UIButton(type: .system)
button.backgroundColor = UIColor(r: 80, g: 101, b: 161)
button.setTitle("Update", for: .normal)
button.setTitleColor(UIColor.white, for: .normal)
button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 16)
button.translatesAutoresizingMaskIntoConstraints = false
button.addTarget(nil, action: #selector(updateProductInfo), for:.touchUpInside)
return button
}()
let enterNewProductButton: UIButton = {
let button = UIButton(type: .system)
button.backgroundColor = UIColor(r: 80, g: 101, b: 161)
button.setTitle("Enter", for: .normal)
button.setTitleColor(UIColor.white, for: .normal)
button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 16)
button.translatesAutoresizingMaskIntoConstraints = false
button.addTarget(nil, action: #selector(enterNewProduct), for:.touchUpInside)
return button
}()
func updateProductInfo() {
guard let price = priceTextField.text,
let location = productLocationTextField.text
else{
print("Please update price and product location")
return
}
}
func verifyNewProduct() {
// need to add a counter that counts how many people verified product information
self.dismiss(animated: true, completion: nil)
}
func enterNewProduct() {
let itemID = metadataObj.stringValue
guard let Description = productDescriptionTextField.text,
let price = priceTextField.text,
let location = productLocationTextField.text
else{
print("Fill basic product information")
return
}
let ref = FIRDatabase.database().reference(fromURL: "")
// creating an item child node
let values = ["Item Description": Description, "Image": price, "Location": location, "Price": price ]
let items = ref.child("Items").child(itemID!)
items.updateChildValues(values, withCompletionBlock: { (err, ref) in
if err != nil {
print(err)
return
}
})
self.dismiss(animated: true, completion: nil)
}
func exitScan() {
//Go back to ViewController
self.dismiss(animated: true, completion: nil)
}
func setupUpdateProductInfo() {
productSummary.addSubview(productDescriptionLabel)
productSummary.addSubview(storeNameLabel)
productSummary.addSubview(priceTextField)
productSummary.addSubview(productLocationTextField)
productSummary.addSubview(verifyProductInfoButton)
productSummary.addSubview(updateProductInfoButton)
productSummary.addSubview(productImageView)
// need x, y, width, height constraints for product image
productImageView.leftAnchor.constraint(equalTo: productSummary.leftAnchor, constant: 12).isActive = true
productImageView.topAnchor.constraint(equalTo: productSummary.topAnchor).isActive = true
productImageView.widthAnchor.constraint(equalTo: productSummary.widthAnchor, constant: 100).isActive = true
productImageView.heightAnchor.constraint(equalToConstant: 100).isActive = true
// need x, y, width, height constraints for store logo
storeNameLabel.leftAnchor.constraint(equalTo: productDescriptionLabel.leftAnchor, constant: 12).isActive = true
storeNameLabel.topAnchor.constraint(equalTo: productSummary.topAnchor).isActive = true
storeNameLabel.widthAnchor.constraint(equalTo: productSummary.widthAnchor).isActive = true
// need x, y, width, height constraints for description label
productDescriptionLabel.leftAnchor.constraint(equalTo: productImageView.leftAnchor, constant: 12).isActive = true
productDescriptionLabel.topAnchor.constraint(equalTo: productSummary.topAnchor).isActive = true
productDescriptionLabel.widthAnchor.constraint(equalTo: productSummary.widthAnchor).isActive = true
productDescriptionLabel.rightAnchor.constraint(equalTo: storeNameLabel.leftAnchor,constant: 12).isActive = true
// need x, y, width, height constraints for price textfield
priceTextField.leftAnchor.constraint(equalTo: productImageView.rightAnchor, constant: 12).isActive = true
priceTextField.topAnchor.constraint(equalTo: productDescriptionLabel.bottomAnchor).isActive = true
priceTextField.widthAnchor.constraint(equalToConstant: 50).isActive = true
// need x, y, width, height constraints for location textfield
productLocationTextField.leftAnchor.constraint(equalTo: priceTextField.rightAnchor, constant: 12).isActive = true
productLocationTextField.topAnchor.constraint(equalTo: productDescriptionLabel.bottomAnchor).isActive = true
productLocationTextField.widthAnchor.constraint(equalToConstant: 50).isActive = true
}
func setupNewProductEntry() {
newProductEntry.addSubview(productImageView)
newProductEntry.addSubview(productLocationTextField)
newProductEntry.addSubview(productDescriptionTextField)
newProductEntry.addSubview(priceTextField)
newProductEntry.addSubview(enterNewProductButton)
newProductEntry.addSubview(descriptionSeparatorView)
newProductEntry.addSubview(priceSeparatorView)
// need x, y, width, height constraints
newProductEntry.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
newProductEntry.topAnchor.constraint(equalTo: view.topAnchor, constant: 100).isActive = true
newProductEntry.widthAnchor.constraint(equalTo: view.widthAnchor, constant: -24).isActive = true
newProductEntry.heightAnchor.constraint(equalToConstant: 150).isActive = true
// need x, y, width, height constraints for name productDescriptionTextField
productDescriptionTextField.leftAnchor.constraint(equalTo: newProductEntry.leftAnchor, constant: 12).isActive = true
productDescriptionTextField.topAnchor.constraint(equalTo: newProductEntry.topAnchor).isActive = true
productDescriptionTextField.widthAnchor.constraint(equalTo: newProductEntry.widthAnchor).isActive = true
// need x, y, width, height constraints for description separator line
descriptionSeparatorView.leftAnchor.constraint(equalTo: newProductEntry.leftAnchor).isActive = true
descriptionSeparatorView.topAnchor.constraint(equalTo: productDescriptionTextField.bottomAnchor).isActive = true
descriptionSeparatorView.widthAnchor.constraint(equalTo: newProductEntry.widthAnchor).isActive = true
descriptionSeparatorView.heightAnchor.constraint(equalToConstant: 1).isActive = true
// need x, y, width, height constraints for name pricetextfield
priceTextField.leftAnchor.constraint(equalTo: newProductEntry.leftAnchor, constant: 12).isActive = true
priceTextField.topAnchor.constraint(equalTo: productDescriptionTextField.bottomAnchor).isActive = true
priceTextField.widthAnchor.constraint(equalTo: newProductEntry.widthAnchor).isActive = true
// need x, y, width, height constraints for price separator line
priceSeparatorView.leftAnchor.constraint(equalTo: newProductEntry.leftAnchor).isActive = true
priceSeparatorView.topAnchor.constraint(equalTo: priceTextField.bottomAnchor).isActive = true
priceSeparatorView.widthAnchor.constraint(equalTo: newProductEntry.widthAnchor).isActive = true
priceSeparatorView.heightAnchor.constraint(equalToConstant: 1).isActive = true
// need x, y, width, height constraints for name LocationTextField
productLocationTextField.leftAnchor.constraint(equalTo: newProductEntry.leftAnchor, constant: 12).isActive = true
productLocationTextField.topAnchor.constraint(equalTo: priceTextField.bottomAnchor).isActive = true
productLocationTextField.widthAnchor.constraint(equalTo: newProductEntry.widthAnchor).isActive = true
}
func setupenterNewProductButton(){
// need x, y, width, height constraints
enterNewProductButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
enterNewProductButton.topAnchor.constraint(equalTo: newProductEntry.bottomAnchor, constant: 12).isActive = true
enterNewProductButton.widthAnchor.constraint(equalTo: newProductEntry.widthAnchor).isActive = true
enterNewProductButton.heightAnchor.constraint(equalToConstant: (50)).isActive = true
}
func setupupdateProductInfoButton(){
// need x, y, width, height constraints
updateProductInfoButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
updateProductInfoButton.topAnchor.constraint(equalTo: productSummary.bottomAnchor, constant: 12).isActive = true
updateProductInfoButton.widthAnchor.constraint(equalTo: productSummary.widthAnchor).isActive = true
updateProductInfoButton.heightAnchor.constraint(equalToConstant: (50)).isActive = true
}
func setupverifyProductInfoButton(){
// need x, y, width, height constraints
verifyProductInfoButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
verifyProductInfoButton.topAnchor.constraint(equalTo: productSummary.bottomAnchor, constant: 12).isActive = true
verifyProductInfoButton.widthAnchor.constraint(equalTo: productSummary.widthAnchor).isActive = true
verifyProductInfoButton.heightAnchor.constraint(equalToConstant: (50)).isActive = true
verifyProductInfoButton.leftAnchor.constraint(equalTo: enterNewProductButton.rightAnchor).isActive = true
}
override func viewDidLoad() {
super.viewDidLoad()
//Get an instance of the AVCaptureDevice class a device object and provide the video as the media type parameter
let captureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
do {
// Get an instance of the AVCaptureDeviceInput class using the previous device object.
let input = try AVCaptureDeviceInput(device: captureDevice)
// Initialize the captureSession object.
captureSession = AVCaptureSession()
// Set the input device on the capture session.
captureSession?.addInput(input)
let captureMetadataOutput = AVCaptureMetadataOutput()
captureSession?.addOutput(captureMetadataOutput)
// Set delegate and use the default dispatch queue to execute the call back
captureMetadataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
captureMetadataOutput.metadataObjectTypes = supportedCodeTypes
// Initialize the video preview layer and add it as a sublayer to the viewPreview view's layer.
videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
videoPreviewLayer?.videoGravity = AVLayerVideoGravityResizeAspectFill
videoPreviewLayer?.frame = view.layer.bounds
view.layer.addSublayer(videoPreviewLayer!)
// Start video capture.
captureSession?.startRunning()
// Add the message label
self.view.addSubview(messageLabel)
self.view.addSubview(exitScanButton)
setupexitScanButton()
//initialize QR Code Frame to highlight the QR Code
qrCodeFrameView = UIView()
if let qrCodeFrameView = qrCodeFrameView {
qrCodeFrameView.layer.borderColor = UIColor.green.cgColor
qrCodeFrameView.layer.borderWidth = 2
view.addSubview(qrCodeFrameView)
}
} catch {
// If any error occurs, simply print it out and don't continue any more.
print(error)
return
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [Any]!, from connection: AVCaptureConnection!) {
// Check if the metadataObjects array is not nil and it contains at least one object.
if metadataObjects == nil || metadataObjects.count == 0 {
qrCodeFrameView?.frame = CGRect.zero
messageLabel.text = "No QR/barcode is detected"
return
}
//Get metadata object
let metadataObj = metadataObjects[0] as! AVMetadataMachineReadableCodeObject
let itemID = metadataObj.stringValue
if supportedCodeTypes.contains(metadataObj.type) {
//if the found metadata is equal to the QR code metadata then update the status label's text and set the the bounds
let barCodeObject = videoPreviewLayer?.transformedMetadataObject(for: metadataObj)
qrCodeFrameView?.frame = barCodeObject!.bounds
if metadataObj.stringValue != nil {
messageLabel.text = metadataObj.stringValue
//Searches firebase for existing barcode
let itemToSearchFor = metadataObj.stringValue
FIRDatabase.database().reference().child("Items").child(itemToSearchFor!).observeSingleEvent(of: .value, with:{(snap) in
print(snap)
}) } else {
setupNewProductEntry()
}
}
}
func setupexitScanButton() {
// need x, y, width, height constraints
exitScanButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
exitScanButton.topAnchor.constraint(equalTo: view.topAnchor, constant: 12).isActive = true
exitScanButton.widthAnchor.constraint(equalToConstant: 60).isActive = true
exitScanButton.heightAnchor.constraint(equalToConstant: (50)).isActive = true
}
}
私のエラーは現在let itemID = metadataObj.stringValueにあります。
あなたのクラスで、それは「グローバル」にするためにqrcodeframeview下のトップでそれを定義します。どちらがエラーを出すのですか？それらのすべて？ – Honey
私のエラーは現在funcであるenterNewProduct（）let itemID = metadataObj.stringValue。 –