Engineering

Notes on the Apple platform techniques these tools are built on, for developers. Swift in these articles is written to illustrate the technique.

Blocking

• Content blocking on Apple platforms. The declarative rule format, compilation, and what WebKit refuses.
• DNS filtering with a Network Extension. Why device-wide filtering runs in a packet tunnel.

Networking

• DNS over TLS in Swift. RFC 7858 with Network.framework, actors, and timeouts.

Extensions

• Sharing data with an app extension. App Groups, atomic writes, and the readers that cache.

Storage

• iCloud Backup and local-only files. Marking a directory, and why SQLite defeats the per-file mark.