1. BUILD FEATURES,
NOT APPS
@NATASHATHEROBOT

2. SWIFT ROBOT
▸ NatashaTheRobot.com
▸ This Week in Swift
▸ Swift Jobs
▸ @NatashaTheNomad
▸ try! Swift

4. Most smartphone users download 0 apps per month

5. An average app loses up to 95% of users within the first month

7. !

10. !"

11. FEATURE:
NOTIFICATIONS

14. FEATURE:
SPEECH
RECOGNITION

17. "As speech recognition accuracy goes from say 95% to 99%, all of us in
the room will from barely using it today to using it all the time. Most
people underestimate the difference between 95% and 99% accuracy -
99% is a game changer" - Andrew NG, Chief Scientist at Baidu

18. SIRI INTENTS:
▸ Audio or video calling
▸ Messaging
▸ Payments
▸ Searching photos
▸ Workouts
▸ Ride booking

19. FEATURE:
EXTENSIONS

24. "It took Line Messenger almost four
months to find its first two million
users ...

25. … but after stickers were launched, it
took only two days to find the next
million...

26. The company now makes over $270M a
year just from selling stickers."

27. THE FUTURE?

29. ! -> "

30. ARCHITECTING
FOR FEATURES

31. ▸ Frameworks all the things!
▸ Decouple sign in
▸ NSUserActivity FTW

34. !

37. OPEN VS PUBLIC

39. let rootURL = FileManager.default().
containerURLForSecurityApplicationGroupIdentifier("group.com.NatashaTheRobot.MyFavoriteGelato")

40. let defaults = UserDefaults(suiteName: "group.com.NatashaTheRobot.MyFavoriteGelato")

42. ! + ⌚ + #

46. MULTIPLATFORM, SINGLE-SCHEME XCODE PROJECTS
by Max Howell on PromiseKit.org

47. FRAMEWORKS
▸ DRY
▸ App Groups
▸ iCloud Key-Value Storage
▸ Cross-Platform

48. SIGN IN

52. !

57. ▸ Decouple Sign In
▸ Profit !

58. NSUSERACTIVITY FTW

59. // AppDelegate
func application(_ application: UIApplication,
continue userActivity: NSUserActivity,
restorationHandler: @escaping ([Any]?) -> Void) -> Bool
{
if userActivity.activityType == NSUserActivityTypeBrowsingWeb,
let webpageURL = userActivity.webpageURL
{
// separate webpageURL using NSURLComponents
// present the correct View Controller if valid
// otherwise, open link in Safari
}
return false
}

65. CREATING AN ACTIVITY
// GelatoDetailViewController
override func viewDidLoad() {
super.viewDidLoad()
// other config here
let activity = NSUserActivity(activityType: "com.natashatherobot.GelatoFinder.gelato")
// will show up as this in Spotlight Search Results
activity.title = gelato.name
// Other keywords to search by
activity.keywords = Set([gelato.name, "gelato"])
// should be handed off to another device?
activity.isEligibleForHandoff = false
// should be indexed in App History?
activity.isEligibleForSearch = true
// should be eligible for indexing for any user of this application?
activity.isEligibleForPublicIndexing = true
// Avoid deallocating before indexing,
// global variable declared in UIResponder class
userActivity = activity
// don't forget to activate!
userActivity!.becomeCurrent()
}

66. SAVE UNIQUE INFO
// GelatoDetailViewController
override func viewDidLoad() {
// create activity and other config here
activity.delegate = self
activity.needsSave = true
// assign to userActivity, etc
}
extension GelatoDetailViewController: NSUserActivityDelegate {
func userActivityWillSave(_ userActivity: NSUserActivity) {
// info needed to recreate activity!
userActivity.userInfo = ["index": gelatoIndex]
}
}

67. RESTORE ACTIVITY
// AppDelegate
func application(_ application: UIApplication,
continue userActivity: NSUserActivity,
restorationHandler: @escaping ([Any]?) -> Void) -> Bool
{
let mainController = (window!.rootViewController! as! UINavigationController).viewControllers.first
mainController?.restoreUserActivityState(userActivity)
return true
}

68. RESTORE ACTIVITY
// GelatoListTableViewController
override func restoreUserActivityState(_ activity: NSUserActivity) {
if let index = activity.userInfo?["index"] as? Int {
searchedGelatoIdentifier = index
performSegue(withIdentifier: "showGelato", sender: self)
}
}

69. RESTORE ACTIVITY
// GelatoListTableViewController
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let gelatoDetailVC = segue.destination as? GelatoDetailViewController {
let index = tableView.indexPathForSelectedRow?.row ?? searchedGelatoIdentifier ?? 0
gelatoDetailVC.gelato = gelatoFlavors[index]
gelatoDetailVC.gelatoIndex = index
}
}

71. NSUSERACTIVITY
▸ Handoff
▸ Universal Links
▸ Search
▸ Location
▸ Contextual Reminders
▸ Contact Interactions

73. ▸ Frameworks all the things!
▸ Decouple sign In
▸ NSUserActivity FTW

74. BUILD FEATURES,
NOT APPS
@NATASHATHEROBOT