Generating QR Codes with Core Image

Scaled QR Code with Core Image (Playground).swift

import Foundation
import UIKit
import PlaygroundSupport

let data = "Hello World!".data(using: .utf8)!
let filter = CIFilter(name: "CIQRCodeGenerator", withInputParameters: ["inputMessage" : data, "inputCorrectionLevel":"L"])
let ciimage = filter!.outputImage!
let transform = CGAffineTransform(scaleX: 7.0, y: 7.0)
let image = ciimage.applying(transform)
let img = UIImage(ciImage: image)

PlaygroundPage.current.liveView = UIImageView(image: img)