Create Breakthrough Apple Watch Apps with the New watchOS 2 and the Updated WatchKit Framework! Apple Watch is improving quickly: Using Apple's new watchOS 2 operating system and the updated WatchKit framework, you can create tomorrow's hottest wearable apps. Learning WatchKit Programming, Second Edition, will help you master these technologies now and gain the same "early mover" advantage that early iPhone developers enjoyed. Leading iOS development trainer and author Wei-Meng Lee guides you step by step through architecting, designing, and building cutting-edge Apple Watch apps. You'll learn how to make the most of the newest platform improvements, including direct programmatic access to key hardware features; support for new Watch Connectivity Framework APIs; and new ways to use location, consume web services, and persist data. Using practical Swift code examples designed for clarity and simplicity, Lee guides you through building apps from the ground up. You'll learn how to build native watch apps that perform exceptionally well on their own and how to integrate your apps with iPhones to do even more. Coverage includes Getting started quickly with watchOS 2 and the newest versions of WatchKit and Xcode Writing high-performance native watch apps that run independent of the iPhone Accessing hardware, including Digital Crown, microphone, Taptic Engine, and health sensors Storyboarding apps and testing them on the Apple Watch Simulator Mastering Apple Watch's multiple-screen navigation Building efficient interfaces with Apple Watch UI controls Customizing each screen's look and feel, and passing data between them Displaying information via labels, images, or tables Passing and returning data to Interface Controllers Programming "complications," such as alarms, tachymeters, chronographs, and calendars Creating apps that display your data on the watch face Using Watch Connectivity Framework APIs to link watch and iOS apps Integrating location services into Apple Watch apps Calling and consuming web services Persisting data on the watch Displaying short- and long-look notifications Implementing glances to help users gather information faster This guide will help you extend your existing iOS skills, build apps that solve a whole new set of problems, and reach millions of people in the fast-growing Apple Watch marketplace.