Swift Networking

If you're working with Network.framework instead of URLSession, this covers the essentials: setting up NWConnection for TCP/UDP, handling connection state transitions, and avoiding the usual mistakes like blocking the main thread or ignoring network switches between WiFi and cellular. It includes migration guidance from BSD sockets and CFSocket, plus specific coverage of iOS 26's new NetworkConnection API with structured concurrency. The troubleshooting reference is helpful when you're staring at connection timeouts or TLS failures. Most useful for peer-to-peer apps, gaming, or custom protocols where you need lower-level control than HTTP gives you.