Embed Size (px)
Citation preview
tvOSPerks and Pitfalls
Axel Roest The App Academy
do{iOS} 2015
whoami
whoami
Happy We got one of the $1 dev. kits
Happy We got one of the $1 dev. kits
Fun
images © ifixit
Dual-core 64-bit Apple A8 chip
2 GB RAM 32 or 64 GB Flash
Rumours„Oh, it’s just web apps”
2different technologies
TVML TVJS2different technologies
iOS traditional
code
TVML TVJS2different technologies
iOS traditional
code
Twofold opportunities
• iOS devs can reuse their knowledge
• web devs can reuse their js+xml knowledge
Twofold opportunities
• iOS devs can reuse their knowledge
• web devs can reuse their js+xml knowledge
Shhhh! Please don’t tell
your web friends this!
Anatomy of the Apple TV
home screen
top row
TVContentItemTopShelf
rest of apps
top row
TVContentItemTopShelf
rest of apps
top row
TVContentItemTopShelf
rest of appsin Focus
un Focus ed
un Focus ed
Anatomy of an app
Two targets:
• TVTopShelfProvider ➔ [TVContentItem]
• Your App ➔
Anatomy of an app
Two targets:
• TVTopShelfProvider ➔ [TVContentItem]
• Your App ➔
tvOS
diff iOS tvOS
• No persistent storage ➔ iCloud only
• 200 MB limit ➔ on-demand resources
• Focus Engine
• No specific iOS frameworks
diff iOS tvOS
• No persistent storage ➔ iCloud only
• 200 MB limit ➔ on-demand resources
• Focus Engine
• No specific iOS frameworks
– Contacts HealthKit
CoreMotion Accounts
diff iOS tvOS
• No persistent storage ➔ iCloud only
• 200 MB limit ➔ on-demand resources
• Focus Engine
• No specific iOS frameworks
– Contacts HealthKit
CoreMotion Accounts
+ TVServices
TVMLKit
Weirdly missing
• HomeKit
• MapKit
• ReplayKit
• VideoToolbox
Weirdly missing
• HomeKit
• MapKit
• ReplayKit
• VideoToolbox
why no Webkit?
WebKit Alternatives
• Create your own layoutengine (NetNewsWire)
• Hack it for your own personal use https://github.com/jvanakker/tvOSBrowser
code is easy
• Add a tvos target
• Add new UIViewControllers
• Run
ux redesign
• UX is a whole new ballgame
• Rethink interaction
• No touch screen: less typing
• new layered icons
ux redesign
• UX is a whole new ballgame
• Rethink interaction
• No touch screen: less typing
• new layered icons
Parallax Previewer
Parallax Previewer
• Difference LSR and LCR files
• Creating in Xcode: drag & export
• create LCR file using layerutil, which converts LSR to LCR.
• LCRs can be used within UIImageviews
• unfortunately, no reverse version of layerutil yet
Gotchas w.r.t. iconsyou need 3 icon layers!
no transparency in back layer
Gotchas w.r.t. icons
Large-AppIconScratch-.xcassets: The last image stack layer with content, "Back", must be a fully opaque bitmap. The pixel at position (602, 475) has an alpha value of 26.
Xcode compiler error:
you need 3 icon layers! no transparency in back layer
TVJS TVML
TVML app• Client-Server
• Written in ‘TVJS’, a javascript framework
• AppDelegate contains URL
• start TVApplicationController
• Use standard web techniques for deployment, analytics, A/B testing etc.
TVML
• you can now totally change an app after you went through the app approval phase.
• ideal for existing web based content
• Tons of standard TVML templates for e.g. alerts, lists, photo stacks
but wait!
You can also put TVML applications
inside UIViewControllers!
pitfalls
Remember to buy
yet another USB cable
Remote
Simulator remote works, but not really well
(But you can connect the Siri remote to the simulator!)
Really easy to test TVML app
python server
however (due to caching?): for each new js tweak you need to reload the app from Xcode. Killing it doesn’t seem to work
No local storage (!)apart from NSUserDefaults
➔ iCloud KVS (< 1MB) and CloudKit
➔ On-Demand Resources
Asset placementand ease of use
no handy keyboard
perks
perks
• iOS app ➔ tvOS
• online content ➔ TVML + TVJS
So many toys, so little time
