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Introduction to tvOS development, given at try! Swift 2016 in Tokyo. 🇯🇵

Boris Bügling

March 02, 2016

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  1. “‘I’d like to create an integrated television set that is

    completely easy to use,’ he told me. [...] ‘It will have the simplest user interface you could imagine. I finally cracked it.’”
  2. STORAGE LIMITATIONS ▸ app is limited to 200 MB ▸

    500 KB of persistent storage (NSUserDefaults) ▸ Use iCloud ▸ Use On-Demand resources
  3. NIBS ! If you don't feel like copy-pasting stuff between

    NIBs ! https://github.com/neonichu/bohne
  4. FOCUS ENGINE UIButton().canBecomeFocused() // == true or false UIButton().focused //

    == true or false UIScreen.mainScreen().focusedView // nil or the view in focus
  5. REACTING TO FOCUS CHANGES func didUpdateFocusInContext(context: UIFocusUpdateContext, withAnimationCoordinator coordinator: UIFocusAnimationCoordinator)

    context.nextFocusedView // the view which gets the focus context.previouslyFocusedView // the view which had the focus func addCoordinatedAnimations(_ animations: (() -> Void)?, completion completion: (() -> Void)?)
  6. CUSTOMFOCUSVIEW let duration = UIView.inheritedAnimationDuration() UIView.animateWithDuration(duration, animations: { if context.nextFocusedView

    == self { self.backgroundColor = UIColor.redColor() } if context.previouslyFocusedView == self { self.backgroundColor = UIColor.whiteColor() } })
  7. DEBUGGING FOCUS print(view.performSelector("_whyIsThisViewNotFocusable")) e.g. for a UILabel Unmanaged<AnyObject>(_value: ISSUE: This

    view has userInteractionEnabled set to NO. Views must allow user interaction to be focusable. ISSUE: This view returns NO from -canBecomeFocused. )
  8. GOOD PLACES FOR BREAKPOINTS func shouldUpdateFocusInContext(_ context: UIFocusUpdateContext) -> Bool

    func didUpdateFocusInContext(_ context: UIFocusUpdateContext, withAnimationCoordinator coordinator: UIFocusAnimationCoordinator)
  9. GESTURES AND BUTTON PRESSES let tapRecognizer = UITapGestureRecognizer(target: self, action:

    "tapped:") let pressTypes = [NSNumber(integer: UIPressType.PlayPause.rawValue)] tapRecognizer.allowedPressTypes = pressTypes; self.view.addGestureRecognizer(tapRecognizer) let swipeRecognizer = UISwipeGestureRecognizer(target: self, action: "swiped:") swipeRecognizer.direction = .Right self.view.addGestureRecognizer(swipeRecognizer)
  10. LOWER-LEVEL API: UIPress Very similar to UITouch-based API in iOS

    func pressesBegan(presses: Set<UIPress>, withEvent event: UIPressesEvent?) func pressesEnded(presses: Set<UIPress>, withEvent event: UIPressesEvent?) func pressesChanged(presses: Set<UIPress>, withEvent event: UIPressesEvent?) func pressesCancelled(presses: Set<UIPress>, withEvent event: UIPressesEvent?)

    ▸ Touch surface is a dpad ▸ Two action buttons ▸ Motion (GCMotion) ▸ Seems not to work in the simulator
  12. NSNotificationCenter.defaultCenter().addObserverForName(GCControllerDidConnectNotification, object: nil, queue: nil) { (note) in if let

    controller = note.object as? GCController { if let microPad = controller.microGamepad { microPad.dpad.valueChangedHandler = { (_, x, y) in if let paddle = self.childNodeWithName("Paddle") { paddle.position.y += CGFloat(y) } } } } }
  13. 2.27 If your app’s core functionality doesn’t work with the

    Siri remote it will be rejected. The app may, however, provide enhanced functionality in connection with a game controller or other peripheral
  14. A maximum of two game controllers (plus one remote) can

    be connected to an Apple TV at any given time.
  15. CONCLUSION ▸ tvOS works very well ▸ If you know

    UIKit, it's easy to start ▸ Think about interaction
  16. RESOURCES ▸ https://developer.apple.com/tvos/human-interface-guidelines/ ▸ "Ich glotz TV", @avbelow, Macoun 2015

    ▸ https://speakerdeck.com/toco/intro-to-tvos ▸ http://nerds.airbnb.com/tvos-focus-engine/ ▸ https://eternalstorms.wordpress.com/2015/10/05/pair-the-apple- tv-developer-kit-siri-remote-with-xcodes-simulator/