Weekly Swift articles, podcasts and tips by John Sundell.

Parsing command line arguments using UserDefaults

Published on 12 Mar 2018

A really cool "hidden" feature of UserDefaults is that it contains any arguments that were passed to the app at launch!

Super useful both in Swift command line tools and scripts, but also to temporarily override a value when debugging iOS apps.

let defaults = UserDefaults.standard
let query = defaults.string(forKey: "query")
let resultCount = defaults.integer(forKey: "results")