Practical WatchKit - Speaker Deck

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PRACTICAL WATCHKIT BY @NEILKIMMETT

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mandsdigital.com

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HOW?

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WKInterfaceButton

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class WKInterfaceButton : WKInterfaceObject { func setTitle(title: String?) func setAttributedTitle(attributedTitle: NSAttributedString?) func setBackgroundColor(color: UIColor?) func setBackgroundImage(image: UIImage?) func setBackgroundImageData(imageData: NSData?) func setBackgroundImageNamed(imageName: String?) func setEnabled(enabled: Bool) }

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button.setText("I'm a button")

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SHARED APP GROUP

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NSUSERDEFAULTS let group = "group.me.kimmett.pushthebutton" let defaults = NSUserDefaults(suiteName: group) defaults?.setInteger(42, forKey: "IMPORTANT_NUMBER") defaults?.integerForKey("IMPORTANT_NUMBER") // 42

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NSFILEMANAGER let group = "group.me.kimmett.pushthebutton" let manager = NSFileManager.defaultManager() if let dir = manager.containerURLForSecurityApplicationGroupIdentifier(group) { // do something with dir }

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CORE DATA?

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CORE DATA if let dir = manager.containerURLForSecurityApplicationGroupIdentifier(group) { let url = dir.URLByAppendingPathComponent(“Database.sqlite”) let coordinator = … coordinator.migratePersistentStore(store, toURL: url, options: nil, withType: NSSQLiteStoreType, error: &error) }

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“on Yosemite and iOS 8, the method discards many-to-many relationships” — http://mjtsai.com/blog/2014/11/22/core-data-relationships-data- loss-bug/

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FIXED IN IOS 8.2

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MOVE THESE FILES .sqlite .sqlite-wal .sqlite-shm

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REAL TIME SYNC?

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REAL TIME SYNC ▸ MMWormhole https://github.com/mutualmobile/MMWormhole ▸ WFNotificationCenter https://github.com/DeskConnect/WFNotificationCenter

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WKINTERFACECONTROLLER class func openParentApplication( userInfo: [NSObject : AnyObject], reply: (([NSObject : AnyObject]!, NSError!) -> Void)?) -> Bool UIAPPLICATIONDELEGATE func application(application: UIApplication, handleWatchKitExtensionRequest: [NSObject : AnyObject]?, reply: (([NSObject : AnyObject]!) -> Void)!)

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OPENPARENTAPPLICATION var task: UIBackgroundTaskIdentifier task = application.beginBackgroundTaskWithExpirationHandler { reply([:]) application.endBackgroundTask(task) task = UIBackgroundTaskInvalid } // do something with userInfo reply(…) application.endBackgroundTask(task) task = UIBackgroundTaskInvalid

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ONE WEIRD TRICK... “…you have to begin – and end, after two seconds – an empty background task right at the beginning of the delegate method.” — http://www.fiveminutewatchkit.com/blog/2015/3/11/one-weird- trick-to-fix-openparentapplicationreply

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ONE WEIRD TRICK... var bogusTask: UIBackgroundTaskIdentifier bogusTask = application.beginBackgroundTaskWithExpirationHandler { application.endBackgroundTask(bogusTask) } let time = dispatch_time(DISPATCH_TIME_NOW, Int64(2 * Double(NSEC_PER_SEC))) dispatch_after(time, dispatch_get_main_queue(), { UIApplication.sharedApplication().endBackgroundTask(bogusTask) }) // do your actual work

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HANDOFF

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WKINTERFACECONTROLLER func updateUserActivity(type: String, userInfo: [NSObject : AnyObject]?, webpageURL: NSURL?) UIAPPLICATIONDELEGATE func application(application: UIApplication, continueUserActivity: NSUserActivity, restorationHandler: ([AnyObject]!) -> Void) -> Bool

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DESIGN TIPS

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BLACK IS THE NEW WHITE

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BLACK IS THE NEW WHITE

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BLACK IS THE NEW WHITE

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REDUCE "TAP DISTANCE"

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REDUCE "TAP DISTANCE"

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REDUCE PADDING

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REDUCE PADDING

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REDUCE PADDING

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REDUCE PADDING

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REFERENCES ▸ “Core Data Relationships Data Loss Bug” by Michael Tsai http://mjtsai.com/blog/2014/11/22/core-data-relationships-data- loss-bug/ ▸ “Tap Distance” by David Smith http://david-smith.org/blog/2015/02/03/ailw-tap-distance/

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REFERENCES ▸ “One weird trick to “fix” openParentApplication:reply:” by Brian Gilham http://www.fiveminutewatchkit.com/blog/2015/3/11/one-weird- trick-to-fix-openparentapplicationreply