This document provides an overview of WatchOS 2 and developing Apple Watch apps. It discusses designing interfaces optimized for the Apple Watch, using Watch Connectivity for background data transfer and interactive messaging between an iOS app and Apple Watch app, and includes a code sample for setting up a Watch Connectivity session. Resources for learning more such as WWDC videos and blogs are also listed.

1. The Zen Guide to
WatchOS 2
@NatashaTheRobot

3. We join spokes together in a wheel,
but it is the center hole
that makes the wagon move.

4. We shape clay into a pot,
but it is the emptiness inside
that holds whatever we want.

5. We hammer wood for a house,
but it is the inner space
that makes it livable.

6. We work with being,
but non-being is what we use.

9. Redesigning the Apple Watch UI by Luke Wroblewski

11. –Apple Watch Programming Guide
“The personal nature of Apple Watch requires a
different approach when it comes to designing
WatchKit app, glance, and notification
interfaces. Your interfaces need to display
information quickly and facilitate fast
navigation and interactions. Creating that
kind of interface means you should not simply
port your existing iOS app behavior over to
Apple Watch. Instead, create a complementary
experience to your iOS app.”

12. Watch Connectivity

13. Background Data
Transfer

14. • application context

15. • application context
• user info transfer

16. • application context
• user info transfer
• file transfer

17. Interactive Messaging

18. • Immediate Information
Transfer
• Requires reachable
state

19. WCSession

20. if WCSession.isSupported() {
let session = WCSession.defaultSession()
session.delegate = self
session.activateSession()
}

21. import WatchConnectivity
class WatchSessionManager: NSObject, WCSessionDelegate {
static let sharedManager = WatchSessionManager()
private override init() {
super.init()
}
private let session: WCSession? =
WCSession.isSupported() ?
WCSession.defaultSession() : nil
func startSession() {
session?.delegate = self
session?.activateSession()
}
}

23. Code Sample

24. Resources
WWDC 2015 Videos to Watch
★ Introducing WatchKit
Connectivity
★ Creating Complications with
ClockKit
★ Networking with NSURLSession
Blogs / Tutorials
★ KristinaThai.com
★ Ray Wenderlich
★ @NatashaTheRobot