- The document discusses using SpriteKit to create games for the Apple Watch. It provides details on the Apple Watch's hardware specifications and input methods. - It introduces SpriteKit and how it can be used to create 2D games and animations. It then explains how SpriteKit works specifically for the Apple Watch, which has limitations due to its small screen size and power constraints. - The presenter provides a quick demo of a SpriteKit game running on the Apple Watch and cautions that the Apple Watch may not be well suited as a primary gaming platform due to its constraints, but could work as an extension to games on other Apple devices.

1. Games on your wrist?
Peter Tuszyński, CTO @ inFullMobile

2. How the hell did I get here?

3. Who am I?
• CTO @ inFullMobile
• EIR @ HardGamma Ventures
• Ex-entrepreneur & founder @ Appvetica
• First mobile dev @ Agora
• Epee fencer, aviation enthusiast, hacker

4. Agenda
• Watch
• SpriteKit 101
• Specifics of SpriteKit on Watch
• Quick DEMO!

5. Watch Internals
• 520 MHz CPU (dual core)
• 512MB RAM (same as iPhone 4)
• 8GB storage
• WIFI / BT / NFC / FM (GPS in
series 2)

6. Watch Sensors
• Ambient light
• Accelerometer
• Gyroscope
• Heart rate

7. Watch Haptic Feedback
• First Apple device to sport
Taptic Engine
• Important events
• Each haptic is combined with
an audio tone

8. Watch Touchscreen Input
• Taps
• Gestures
• Swipe
• Pan
• Force touch

9. Watch Hardware Input
• Digital Crown
• Side button
• Sensors

10. Philosophies of Watch
• Watch is not another place to
spam your users with irrelevant
data
• Unlike building apps for iPhone,
Watch apps won’t make you a
millionaire
• Current iteration of AppleWatch
isn’t iPhone 1.0
• It’s not called an iWatch!

11. SpriteKit 101

12. SpriteKit
• 2D rendering and animation framework shipped
with iOS SDK
• Allows to manage layers as hierarchical tree of
nodes
• Root of all nodes is SKNode -> UIResponder ->
NSObject
• It’s fairly simple to use (& debug!)

13. SKView
• In charge of displaying SpriteKit scene
• SKView -> UIView -> UIResponder -> NSObject

14. SKScene
• SKScene object is the root of all node trees
displayed in SpriteKit
• SKScene inherits from SKNode
• Displayed in UI by SKView (presentScene:)

15. SKSpriteNode
• Most common node type
• Can display images
(textures) or rectangular
area filled with a color
• Position = point where
sprite is drawn with
reference to its parent
node
Origin
Anchor point (0.5, 0.5)
Position
Y
X

16. SKAction
• Animation (or other event) which occurs over a
period of time
• Actions are run on sprite instances
SKAction *action = [SKAction
rotateByAngle:M_PI/2 duration: 1]
[mysprite runAction:action]

18. Scene editor

19. SpriteKit + Watch

20. Is this a joke?
• Hell no :)
• SpriteKit & SceneKit are
available in WatchOS3
• Remember slide about
Philosophies of Watch? :)
• It’s A WATCH.

21. SpriteKit vs SpriteKit on
WatchOS

22. SpriteKit vs SpriteKit on
WatchOS

23. Touch recognition
• WKGestureRecognizer
• WKTapGestureRecognizer
• WKPanGestureRecognizer
• WKSwipeGestureRecognizer
• WKLongPressGestureRecognizer

24. DigitalCrown API
WKInterfaceController
crownSequencer: WKCrownSequencer
rotationsPerSecond: Double
isIdle: Bool
crownDidRotate(WKCrownSequencer?, rotationalDelta: Double)
crownDidBecomeIdle(WKCrownSequencer?)

25. CoreMotion

26. Quick demo time!

27. Recap
• Just because you can doesn’t
mean you have to
• IMHO screen estate, performance
& power constraints greatly limit
Watch as a game platform
• Extension/Companion to a ‘big’
game on AppleTV, iPad, iPhone

28. Thanks!
• piotr.tuszynski@infullmobile.com
• @dusker