Paris Buttfield-Addison & Jon Manning 
Swift Development for the Apple Watch [PDF ebook] 
An Intro to the WatchKit Framework, Glances, and Notifications

Apple Watch is the sort of science-fiction gadget that people used to dream about as kids. What kinds of apps do you envision for this new device? If youre comfortable using OS X, Xcode, and i OSand familiar with Swiftthis concise book shows you the basics of building your own apps for this wrist-mounted computer with Apples Watch Kit framework.Youll learn what an Apple Watch is, what it isnt, and how and why people might interact with apps you build for it. This practical guide also examines the type of apps most suitable for this device, and shows you how to be a good citizen in the i OS/Watch ecosystem.Learn the Watch app lifecycle, and understand how these apps interact with the users i Phone Build a Watch app and its i OS counterpart by adding controls, working with multiple screens, and sharing data Design a simple glance, the non-interactive Watch component that provides quick-look information Add functionality to the notification system, including actionable items, and display them on the Watch face Design and build complications, Watch-face gadgets that can display quick snapshots of information, including future events with Time Travel