Learn how to use complications, local notifications and background tasks to make your app essential for your users, without them having to do anything. Using certain features of Apple watch development, you can keep up with your users without much or any direct interaction.

1. WITH WATCHOS 3
DRIVING USER ENGAGEMENT
KRISTINA THAI
IOS SOFTWARE ENGINEER
⌚
@KRISTINATHAI

2. @KRISTINATHAI
USER ENGAGEMENT
🙋
📲🙋
🌧 🍝 🌇

3. @KRISTINATHAI
💇
???
💃 🏄
USER ENGAGEMENT

4. @KRISTINATHAI
⌚
Background
Tasks
Complications
Local
Notifications
USER ENGAGEMENT

5. COMPLICATIONS

6. @KRISTINATHAI

7. @KRISTINATHAI

8. @KRISTINATHAI

9. @KRISTINATHAI

10. @KRISTINATHAI
import ClockKit
class ComplicationController: NSObject, CLKComplicationDataSource {
// MARK: - Timeline Configuration
func getSupportedTimeTravelDirections(for complication: CLKComplication, withHandler handler: @escaping (CLKComplicationTimeTravelDirections) -> Void) {
handler([.forward, .backward])
}
func getTimelineStartDate(for complication: CLKComplication, withHandler handler: @escaping (Date?) -> Void) {
handler(nil)
}
func getTimelineEndDate(for complication: CLKComplication, withHandler handler: @escaping (Date?) -> Void) {
handler(nil)
}
func getPrivacyBehavior(for complication: CLKComplication, withHandler handler: @escaping (CLKComplicationPrivacyBehavior) -> Void) {
handler(.showOnLockScreen)
}
// MARK: - Timeline Population
func getCurrentTimelineEntry(for complication: CLKComplication, withHandler handler: @escaping (CLKComplicationTimelineEntry?) -> Void) {
// Call the handler with the current timeline entry
handler(nil)
}
func getTimelineEntries(for complication: CLKComplication, before date: Date, limit: Int, withHandler handler: @escaping ([CLKComplicationTimelineEntry]?) -> Void) {
// Call the handler with the timeline entries prior to the given date
handler(nil)
}
func getTimelineEntries(for complication: CLKComplication, after date: Date, limit: Int, withHandler handler: @escaping ([CLKComplicationTimelineEntry]?) -> Void) {
// Call the handler with the timeline entries after to the given date
handler(nil)
}
// MARK: - Placeholder Templates
func getLocalizableSampleTemplate(for complication: CLKComplication, withHandler handler: @escaping (CLKComplicationTemplate?) -> Void) {
// This method will be called once per supported complication, and the results will be cached
handler(nil)
}
}

11. @KRISTINATHAI
Optional
@KRISTINATHAI

12. @KRISTINATHAI
import ClockKit
class ComplicationController: NSObject, CLKComplicationDataSource {
// MARK: - Timeline Population
func getCurrentTimelineEntry(for complication: CLKComplication, withHandler handler: @escaping (CLKComplicationTimelineEntry?) -> Void) {
// Call the handler with the current timeline entry
handler(nil)
}
func getTimelineEntries(for complication: CLKComplication, before date: Date, limit: Int, withHandler handler: @escaping
([CLKComplicationTimelineEntry]?) -> Void) {
// Call the handler with the timeline entries prior to the given date
handler(nil)
}
func getTimelineEntries(for complication: CLKComplication, after date: Date, limit: Int, withHandler handler: @escaping
([CLKComplicationTimelineEntry]?) -> Void) {
// Call the handler with the timeline entries after to the given date
handler(nil)
}
}

13. @KRISTINATHAI
func getCurrentTimelineEntry(for complication: CLKComplication, withHandler handler: @escaping
(CLKComplicationTimelineEntry?) -> Void) {
// Call the handler with the current timeline entry
handler(nil)
}

14. https://theswiftdev.com/2016/04/28/clockkit-complications-cheat-sheet/
CLKComplicationTemplate
@KRISTINATHAI

15. @KRISTINATHAI

16. @KRISTINATHAI

17. @KRISTINATHAI
func getCurrentTimelineEntry(for complication: CLKComplication, withHandler handler: @escaping
(CLKComplicationTimelineEntry?) -> Void) {
// Call the handler with the current timeline entry
let template = CLKComplicationTemplateModularLargeStandardBody()
template.headerTextProvider = CLKSimpleTextProvider(text: “12:00-2:00PM”)
template.body1TextProvider = CLKSimpleTextProvider(text: "Lunch with Lucas")
template.body2TextProvider = CLKSimpleTextProvider(text: "Saru Sushi")
let timelineEntry = CLKComplicationTimelineEntry(date: Date(), complicationTemplate: template)
handler(timelineEntry)
}

18. @KRISTINATHAI

19. BACKGROUND
TASKS

20. @KRISTINATHAI

21. @KRISTINATHAI
BACKGROUND TASKS
WKApplicationRefreshBackgroundTask⌚
WKSnapshotRefreshBackgroundTask📷
WKWatchConnectivityRefreshBackgroundTask📲
WKURLSessionRefreshBackgroundTask🌐

22. @KRISTINATHAI
WKApplicationRefreshBackgroundTask⌚
⌚ 🌐⌚
NSURLSession
📷⌚
Snapshots
Update app from background

23. @KRISTINATHAI
WKSnapshotRefreshBackgroundTask📷
Make updates to your app’s UI
Supporting up-to-date snapshots keeps your users informed

24. @KRISTINATHAI
WKURLSessionRefreshBackgroundTask🌐
🌐⌚
Trigger NSURLSession to update app from background

25. @KRISTINATHAI
WKWatchConnectivityRefreshBackgroundTask📲
📱⌚
Get latest data from iPhone via Watch Connectivity
📱⌚
Be a good battery/data citizen by pulling data from server only once
🌐

26. LOCAL
NOTIFICATIONS

27. @KRISTINATHAI
LOCAL NOTIFICATIONS
Like push notifications, but scheduled locally
Handled by UNUserNotificationCenter
(allows management of duplicates sent to both devices)

28. @KRISTINATHAI
// Create the content
let content = UNMutableNotificationContent()
content.title = NSString.localizedUserNotificationString(forKey: "Hello!", arguments: nil)
content.body = NSString.localizedUserNotificationString(forKey: "Hello_message_body", arguments: nil)
content.sound = UNNotificationSound.default()
// Deliver the notification in five seconds.
let trigger = UNTimeIntervalNotificationTrigger.init(timeInterval: 5, repeats: false)
let request = UNNotificationRequest.init(identifier: "FiveSecond", content: content, trigger:trigger)
// Schedule the notification.
let center = UNUserNotificationCenter.current()
center.add(request)
Create scheduled local notification

29. @KRISTINATHAI
LOCAL NOTIFICATIONS
UNUserNotificationCenter
Create custom responses for your notifications

30. @KRISTINATHAI
Respond to custom notification action
func userNotificationCenter(_ center: UNUserNotificationCenter,
didReceive response: UNNotificationResponse,
withCompletionHandler completionHandler: @escaping () -> Void) {
if response.actionIdentifier == "Complete" {
//Handle response here
}
}

31. @KRISTINATHAI
BOTTOM LINE
Use these to engage your user without any direct interaction
⌚
Background
Tasks
Complications
Local
Notifications

32. @KRISTINATHAI
RESOURCES
kristina.io/watchos-3-key-takeaways-from-wwdc16
kristina.io/watchos-3-key-takeaways-from-wwdc16-part-2

33. kristina.io
me@kristina.io
@kristinathai
THANK YOU
-