Two weeks ago I posted the first part of a tutorial about how to build an Apple Watch app UI using WatchKit, using a WKInterfaceController and a storyboard. We’ve built the main screen for the SmogWatch app, showing a big colored circle with the PM10 v...

This is the third part of my series about building a WatchKit app that shows current air pollution level on the watch face (it started here). In this episode, we’re going to build the app’s main UI. I will be building on top of some data handling & ne...

This post is the second (or technically third) part of my series about building a WatchKit app that shows current air pollution level on the watch face. If you haven’t seen the previous parts, you might want to at least take a look at the intro.

Update 03.07.2019: watchOS 6 has changed a lot of things that I’ve written about here, so I went through the post again and updated all parts that got out of date.

Ever since I saw the first Apple Watch announced on stage, I wanted to learn to write apps for it. I bought my first Watch half a year later, when they finally appeared in Europe, with that thought in mind. You can probably guess how that went…