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Practical WatchKit Development @claushoefele

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WatchKit App WatchKit Extension iOS App WatchKit App vs Extension

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class TripDetailInterfaceController: WKInterfaceController { @IBOutlet private weak var map: WKInterfaceMap! override func awakeWithContext(context: AnyObject?) { super.awakeWithContext(context) ... } override func willActivate() { super.willActivate() ... } }

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map.addAnnotation(coordinate, withPinColor: .Red) let coordinateRegion = MKCoordinateRegionMakeWithDistance[...] map.setRegion(coordinateRegion)

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Tables

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Paging

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Interactive Notifications

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Hides when loading

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Bezel WatchSim

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• Storyboards • WKInterfaceController • Optimizations • Tools User Interface

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WatchKit App WatchKit Extension Requesting Data

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WatchKit App WatchKit Extension iOS App Requesting Data

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private func callParentApp() { let userInfo = ["input": "data"] WKInterfaceController.openParentApplication(userInfo) { replyInfo, error in println("reply \(replyInfo)") } }

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private func callParentApp() { let userInfo = ["input": "data"] WKInterfaceController.openParentApplication(userInfo) { replyInfo, error in println("reply \(replyInfo)") } } func application(application: UIApplication!, handleWatchKitExtensionRequest userInfo: [NSObject : AnyObject]!, reply: (([NSObject : AnyObject]!) -> Void)!)

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Handoff

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WatchKit Extension iOS App Sharing Data

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let defaults = NSUserDefaults(suiteName: "group.com.claushoefele.T")! func updateObjectForKey(key: String, item: T) { let data = NSKeyedArchiver.archivedDataWithRootObject(item) defaults.setObject(data, forKey: key) }

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WatchKit Extension iOS App Signalling

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func sendDarwinNotification(identifier: String) { let darwinNotificationCenter = CFNotificationCenterGetDarwinNotifyCenter() CFNotificationCenterPostNotification(darwinNotificationCenter, identifier, nil, nil, 1); } CFNotificationCenterAddObserver

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Data Sync

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• Execute in background • Handoff • Share data • Signal changes Handling data

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“A WatchKit app complements your iOS app; it does not replace it.” –Apple Watch HIG

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“Anything that could show the user a progress spinner (however briefly) is a failure on my part.” –David Smith

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“Does a wearable mean data intrudes even more into your life, or do the constraints (screen size etc) act as a filter to reduce overload?” –Bendict Evans

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Practical WatchKit Development @claushoefele