mDevcon 2015: See the time on your wrist

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See#the#&me#on#your#wrist Jeroen&Leenarts

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Abstract For$a$long$)me,$people$were$only$able$to$see$the$)me$on$their$ (smart)phones”.$Apple$came$with$a$brilliant$inven)on$that$allows$us$ to$see$the$)me$on$our$wrist!$Or$perhaps$that’s$just$what$the$ youngest$genera)on$will$think$a$few$years$from$now. Of#course#the#new#Apple#Watch#does#allow#us#to#do#much#more# than#just#see#the#6me.#In#this#session#we#will#see#how#to#use# WatchKit,#how#to#integrate#it#with#exis6ng#apps,#create#Glances# and#Watch#speciﬁc#no6ﬁca6ons.

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Now$I$do$lots$of$crypto$stuﬀ with%iOS

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Designer(says: That%is%oﬀ%by%one%pixel.

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CocoaHeads.nl

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Topics'of'today • The%Apple%Watch • Developer%overview • Share%data%extension%&%containing%app • Q&A

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The$Apple$Watch

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3"days"from"now

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One$of$the$biggest$surprises$for$ Apple$Watch$will$be$the$breadth$of$ what$it$will$do. —"Tim"Cook1 1"Tuesday"February"10,"2015"1"Goldman"Sachs"Technology"Conference

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Apps Glances No#ﬁca#ons

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Design'resources Available(on:(h-ps:/ /developer.apple.com/watchkit/ 9(Photoshop(templates 9(Sketch(templates 9(Fonts 9(Style(guides

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Developer(overview

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Developer(overview

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Developer(overview

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Developer(overview Apps

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Apps • Complements+iOS+app • Paired+with+the+user’s+iPhone • One7on7one+rela8on

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Apps • Supports)two)naviga0on)methods • Hierarchical)(tapping) • Page;based)(swiping)

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Apps • Supports)two)naviga0on)methods • Hierarchical)(tapping) • Page8based)(swiping)

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Apps • Supports)two)naviga0on)methods • Hierarchical)(tapping) • Page%based)(swiping)

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Apps • Taps • Ver)cal,swipes,/,Horizontal,swipes,/,Le6,edge,swipes • Force,Touch • The,Digital,Crown

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Developer(overview Glances

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Glances • Browsable+collec-on+of+-mely+and+contextually+relevant+ moments. • Individually,+a+Glance+is+a+quick+view+of+your+app’s+most+ important+content. • Tapping+your+app’s+glance+interface+always+launches+the+app.

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Glances • Template)based • Not/scrollable • Associated/with/a/single/ac8on • Op8onal

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Developer(overview No#ﬁca#ons

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No#ﬁca#ons • Enabled)by)default,)all)no0ﬁca0ons)can) end)up)on)Watch • Types: • Quick)look • Sta0c)/)Dynamic

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No#ﬁca#ons

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No#fica#ons • You%can%design%mul0ple%no0fica0ons%by%using%the%no0fica0on% "category" • Think%about%supplying%one%named%"default"

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No#ﬁca#ons

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Developer(overview Available(components

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Available(components

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Available(components Groups '(Lay(out(items(horizontally(or(ver5cally '(One(or(more(other(interface(elements You$can$nest$these

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Developer(overview Limita&ons

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Limita&ons • Avoid'using'technologies'that'request'user'permission • Do'not'use'background'execu:on'modes • Avoid'performing'long

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Limita&ons • Everything,is,done,within,a,Storyboard,ﬁle • Communica:on,over,bluetooth • Simulator,simulates,the,latency

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Share&data&extension&&&containing& app

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Share&data&extension&&&containing&app Documenta*on+is+very+terse+here+2>+224+words Create&a&shared&app&group .&Use&UserDefaults&for&preferences .&Write&ﬁles&to&share&bigger&chunks&of&data Example: objectivec self.sharedDefaults = [[NSUserDefaults alloc] initWithSuiteName:@"group.com.xebia.myapp.mywatch "];

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Share&data&extension&&&containing&app Enter&technical¬e&TN2408 3&File&coordinators&and&shared&containers&is&a&no3no

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Share&data&extension&&&containing&app Instead(use *(CFPreferences *(writeToFile:atomically:((Atomic(write) *(SQLite *(Core(Data In#no#way#is#your#data#guaranteed#to#be#stored#with#SQLite#and# Core#Data.

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Share&data&extension&&&containing&app Think&about&wri.ng&data&though 1&SQLite&and&Core&Data&double&entries 1&Atomic&writes,&last&writer&wins Storing(in(the(cloud(works(very(well 4(Be(it(CloudKit(or(a(random(web(address

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Share&data&extension&&&containing&app What%about openParentApplication:reply: application:handleWatchKitExtensionRequest:reply: ? Well $%Pre(y%slow $%Gets%even%slower%with%more%data $%But%very%useful,%it%wakes%up%the%containing%app

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Share&data&extension&&&containing&app So#how#to#make#this#easier? How$about$things$like$MMWormhole? 6$This$is$actually$pre;y$decent. 6$Uses$Darwin$no@ﬁca@ons$(Apple$dev$conﬁrms$this$is$ok)

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Share&data&extension&&&containing&app As#simple#as [self.wormhole passMessageObject:@{@"buttonNumber" : @(1)} identifier:@"button"]; [self.wormhole listenForMessageWithIdentifier:@"button" listener:^(id messageObject) { self.numberLabel.text = [messageObject[@"buttonNumber"] stringValue]; }]; Internally)uses)Darwin)No1ﬁca1ons)and)atomic)writes

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Q&A

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Links TN2408'('h*ps:/ /developer.apple.com/library/ios/technotes/ tn2408/_index.html Devforums'conﬁrming'Darwin'noFﬁcaFons'is'ok'('h*ps:/ / developer.apple.com/library/ios/technotes/tn2408/_index.html MMWormHole'('h*ps:/ /github.com/mutualmobile/MMWormhole Apple'Watch'Programming'Guide