Learn WatchKit for iOS covers the development of applications for the
new Apple Watch using the WatchKit framework in iOS 8 and the Swift
programming language. In this book, an Apple Watch application is an
extension to an existing iOS app and is packaged and submitted to the
App Store along with it. Using a suite of simple examples, Kim Topley,
co-author of Beginning iPhone Development with Swift, introduces and
explains every feature of WatchKit and the associated technologies that
you'll need to understand to build Apple Watch applications for iOS 8,
culminating in a complete WatchKit application that shows weather
forecast information for various cities around the world on the Apple
Watch.