Mark can't figure out how to get out of New York City, so this week Gordon is joined by fellow thoughtbotter Avi Gilligan to talk about learning Swift, Objective-C, and iOS.

• Follow Avi on Twitter
• Tropos
• Treehouse
• Human Interface Guidelines
• Beginning iOS Development with Swift
• Ingress
• Nullability auditing in Objective-C
• Realm
• NSHipster article on Back Row
• Upcase
• New York iOS Women's Meetup