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A practical guide to implementing QR code generation and scanning in SwiftUI using Core Image and AVFoundation. Covers the full pipeline: converting strings to UTF-8 data, applying CIFilter for QR generation, configuring error correction levels, customizing colors, and proper scaling to avoid interpolation artifacts. For scanning, explains setting up AVCaptureSession with metadata output and exposing results via a Combine PassthroughSubject into an MVVM architecture. Also covers production considerations like stopping the session after detection, running camera setup on background queues, and extending the system with structured JSON payloads for deep linking, authentication, and offline data exchange.

Mastering QR Code Generation & Scanning in SwiftUI

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