It's interesting to look back and see that many of the features that were added to Objective-C over the last few years were to support the move towards Swift. It's still happening too! In fact there were several new Objective-C features introduced at WWDC this year. Jordan Morgan has the details.
I mostly agree with this article by Jared Sinclair. It's perfectly fine to just get something up and running quickly without worrying about code quality at every step of the way. However, you should also be working on improving your personal coding skills so that good code appears more naturally when you're hacking something together. There's always an opportunity to go back and improve things later.
Drew Crawford with a lengthy article looking in detail at a question which has been asked hundreds of times since the release of Swift. Structs or Classes?
Ethan Fan with a little proof of concept to get streaming heart rate data out of watchOS 2 and on to the phone.