How to Build a QR Code Generator App in SwiftUI

import SwiftData
import Foundation

@Model
final class QRCodeItem {
    var id: UUID
    var inputText: String
    var label: String
    var foregroundHex: String
    var backgroundHex: String
    var createdAt: Date

    init(
        inputText: String,
        label: String = "",
        foregroundHex: String = "#000000",
        backgroundHex: String = "#FFFFFF"
    ) {
        self.id = UUID()
        self.inputText = inputText
        self.label = label
        self.foregroundHex = foregroundHex
        self.backgroundHex = backgroundHex
        self.createdAt = Date()
    }
}

import SwiftUI

struct GeneratorView: View {
    @State private var inputText = ""
    @State private var fgColor: Color = .black
    @State private var bgColor: Color = .white
    @State private var qrImage: UIImage?

    var body: some View {
        VStack(spacing: 20) {
            TextField("URL, text, or contact…", text: $inputText)
                .textFieldStyle(.roundedBorder)
                .autocorrectionDisabled()
                .textInputAutocapitalization(.never)
            HStack(spacing: 24) {
                ColorPicker("Foreground", selection: $fgColor)
                ColorPicker("Background", selection: $bgColor)
            }
            if let image = qrImage {
                Image(uiImage: image)
                    .interpolation(.none)
                    .resizable().scaledToFit()
                    .frame(maxWidth: 220)
                    .clipShape(RoundedRectangle(cornerRadius: 12))
                    .shadow(radius: 8)
            }
            Button("Generate QR Code") {
                qrImage = QRCodeGenerator.make(
                    text: inputText,
                    foreground: UIColor(fgColor),
                    background: UIColor(bgColor))
            }
            .buttonStyle(.borderedProminent)
            .disabled(inputText.trimmingCharacters(in: .whitespaces).isEmpty)
        }
        .padding()
        .navigationTitle("QR Generator")
    }
}

import CoreImage
import CoreImage.CIFilterBuiltins
import UIKit

enum QRCodeGenerator {
    static func make(
        text: String,
        foreground: UIColor,
        background: UIColor,
        scale: CGFloat = 12
    ) -> UIImage? {
        let ctx = CIContext()
        let qr = CIFilter.qrCodeGenerator()
        qr.message = Data(text.utf8)
        qr.correctionLevel = "M"
        guard let raw = qr.outputImage else { return nil }

        // color0 = dark modules, color1 = light modules
        let colorize = CIFilter.falseColor()
        colorize.inputImage = raw
        colorize.color0 = CIColor(color: foreground)
        colorize.color1 = CIColor(color: background)
        guard let colored = colorize.outputImage else { return nil }

        let scaled = colored.transformed(
            by: CGAffineTransform(scaleX: scale, y: scale))
        guard let cg = ctx.createCGImage(scaled, from: scaled.extent) else {
            return nil
        }
        return UIImage(cgImage: cg)
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
  "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>NSPrivacyTracking</key><false/>
  <key>NSPrivacyTrackingDomains</key><array/>
  <key>NSPrivacyCollectedDataTypes</key><array/>
  <key>NSPrivacyAccessedAPITypes</key>
  <array>
    <dict>
      <key>NSPrivacyAccessedAPIType</key>
      <string>NSPrivacyAccessedAPICategoryFileTimestamp</string>
      <key>NSPrivacyAccessedAPITypeReasons</key>
      <array><string>C617.1</string></array>
    </dict>
  </array>
</dict>
</plist>