CoreImage 안에 QR 생성하는 CIFilter라는 것이 있음

UIImage Extension으로 쓰기

import CoreImage.CIFilterBuiltins

extension UIImage {
  static func generateQR(string: String, placeholder: UIImage = UIImage(systemName: "photo")!) -> UIImage {
    let context = CIContext()
    let filter = CIFilter.qrCodeGenerator()

    filter.message = Data(string.utf8)

    if let outputImage = filter.outputImage {
      if let cgImage = context.createCGImage(outputImage, from: outputImage.extent) {
        return UIImage(cgImage: cgImage)
      }
    }
    return placeholder
  }
}

SwiftUI에서 사용

Image(uiImage: UIImage.generateQR(string: "<https://google.com>"))
  .interpolation(.none)
  .resizable()
  .scaledToFit()
  .frame(width: 150, height: 150)

interpolation(.none)을 안하면 결과가 흐릿하게 나옴