Practical WatchKit

Given at NSLondon on 23/04/2015.

Transcript

1. PRACTICAL WATCHKIT
   BY
   @NEILKIMMETT
   

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5. mandsdigital.com
   

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9. HOW?
   

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14. WKInterfaceButton
    

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

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24. SHARED APP GROUP
    

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25. 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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26. 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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27. CORE DATA?
    

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28. 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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30. “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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31. FIXED IN IOS 8.2
    

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

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33. REAL TIME SYNC?
    

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

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35. 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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36. 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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37. 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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38. 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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39. HANDOFF
    

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40. 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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41. DESIGN TIPS
    

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42. BLACK IS THE NEW WHITE
    

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43. BLACK IS THE NEW WHITE
    

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44. BLACK IS THE NEW WHITE
    

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47. REDUCE "TAP DISTANCE"
    

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48. REDUCE "TAP DISTANCE"
    

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50. REDUCE PADDING
    

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51. REDUCE PADDING
    

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52. REDUCE PADDING
    

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53. REDUCE PADDING
    

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54. 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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55. 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
    

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56. SLIDES
    http://kimmett.me/talks/practical-watchkit.html
    

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57. QUESTIONS?
    

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