Book Image

Building Apple Watch Projects

By : Stuart Grimshaw
Book Image

Building Apple Watch Projects

By: Stuart Grimshaw

Overview of this book

With Apple’s eagerly anticipated entry into the wearable arena, the field is wide open for a new era of app development. The Apple Watch is one of the most important technologies of our time. This easy-to-understand book takes beginners on a delightful journey of discovering the features available to the developer, right up to the completion of medium-level projects ready for App Store submission. It provides the fastest way to develop real-world apps for the Apple Watch by teaching you the concepts of Watch UI, visual haptic and audio, message and data exchange between watch and phone, Web communication, and finally Visual, haptic as well as audio feedback for users. By the end of this book, you will have developed at least four fully functioning apps for deployment on watchOS 2.
Table of Contents (17 chapters)
Building Apple Watch Projects
About the Author
About the Reviewer


Way back in Chapter 2, Hello Watch, we used some simple animation to change the background color of the WKInterfaceGroup, which, if you remember, involved calling a method available in WKInterfaceController which takes two arguments, the duration of the animation and a block of code that contains the changes in appearance that should be animated. We saw that even the subtlest of animations can add a sense of "something happening" on the screen, with only a tiny amount of code. Plenty of bang for the buck there.

We are, however, faced with certain limitations of the methods that WatchKit provides us with, one of which is that all the animated changes take place concurrently; it's all at once or not at all. Yet we can easily imagine that even the most modest of animations (we're really not talking Pixar here) might require a series of discrete steps in a particular order. We might want to animate a change in the position of the WKInterfaceGroup and then have it change its background...