While Your App is Sleeping

iOSDevUK 2015, NSSpain 2015 — An overview of downloading while your app is in the background using Background Transfer Services.

Why Swift is Swift

Swift Summit 2015 — Why Swift can be faster than Objective-C through static dispatch and vtables.

Keep Calm and Type Erase On

try!Swift 2016 — A short primer of type theory and the motivation for using type erasure. Basically, if you've ever needed to use generics in a protocol, this is how you do it.