The article explains how to generate QR codes from text using Core Image's built in qrCodeGenerator filter. It presents QRCodeGenerator as an enum with static functions (acting as a namespace, not an initializable type). The implementation uses CIFilter.qrCodeGenerator(), sets the message as Data from the input string, applies error correction level M, scales the output image (typically by 12x because the raw output is tiny), converts to CGImage then UIImage then SwiftUI Image. The article also covers using .interpolation(.none) to keep edges crisp, separating user input from committed QR code text with two @State properties, and handling failure cases.
