10 May 2016 P1.0 (Printing)

First printing.

25 April 2016 B.6.0

Production is complete. Now it’s on to layout and the printer.

09 March 2016 B5.0

The book is content-complete and heading to production.

01 February 2016 B4.0

Our third update brings another new chapter: Chapter 10, Extending Complications with Time Travel. This chapter takes the ClockKit complications from Chapter 11, Getting Personal with Sensor Data and HealthKit, and adds the dimension of time to them, allowing you to show your users their complication data in the past, present, and future. In addition, Chapter 8, Communicating with the WatchConnectivity Framework, has been rewritten from the ground up to focus solely on WatchConnectivity, with the HealthKit portion of the book explained in full in Chapter 11.

14 January 2016 B3.0

Our second update brings a new chapter: Chapter 12, Unlocking Watch App
Performance. It shows you how to make watch apps that start up quickly and
perform admirably, as well as how to use the Instruments developer tool to
analyze performance and get real data about your app.

23 December 2015 B2.0

Our first update to the beta is a big one, adding two whole chapters. Chapter 7, WatchKit Extension Lifecycle, shows you how to use your extension delegate to respond to application state changes, handle your users’ response to notifications, and coordinate Handoff activity between your users’ different Apple devices. Chapter 11, Getting Personal with Sensor Data and HealthKit, covers the capabilities of the Apple Watch as a hardware input device and shows you how to use HealthKit to enable heart rate monitoring, track workouts, and access health data.

08 December 2015 B1.0

Initial beta release.