[ben_w]

Fairly easy. The language itself is an improvement, the hardest part was the correct use of ?, ??, and !, which isn't that hard.

Lots of the kind of mistake one can make in ObjC and only notice at runtime, get caught at compile time in swift.

The frameworks are more of a mess: SwiftUI is something I want to like, but mostly gets in the way. There's now too many different ways to do background tasks, all promising to solve everything.

But you can still use UIKit and GCD, and I prefer to when I can.