Build Once Use Everywhere

Reuse your code across platforms in order to build apps for all of Apple's App Stores!

This talk was given at UIKonf 2016.

Transcript

1. BUILD ONCE USE
   EVERYWHERE
   DASMER SINGH
   @DASMERSINGH
   

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2. HISTORY
   

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3. 1984
   APPLE RELEASES
   MACINTOSH
   

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4. 2007
   APPLE RELEASES
   IPHONE
   

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5. 2011
   APPLE RELEASES
   IPAD
   

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6. 2015
   APPLE RELEASES
   APPLE WATCH AND
   APPLE TV 4
   

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8. 2016
   SO WHERE ARE WE
   TODAY?
   

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9. MOST APPS ARE WRITTEN ON IOS
   > 2.3 million iOS Apps 1
   > 10,000+ Apple Watch apps2
   > 1,000+ Apple TV apps3
   > 30,000 Mac Apps1
   1 (May 2016) Appshopper
   3 (Nov 2015) DigitalTrends
   2 (Sept 2015) TechCrunch
   

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10. WRITING APPS FOR OTHER PLATFORMS IS
    PROBABLY MUCH EASIER THAN YOU
    THINK...
    

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11. WRITING APPS FOR OTHER PLATFORMS IS
    PROBABLY MUCH EASIER THAN YOU
    THINK...
    1. You already know Swift
    2. You already know many core frameworks
    

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12. COMMONLY USED IOS FRAMEWORKS
    ALREADY ON TVOS
    > UIKit
    > Foundation
    > Core Location
    > CoreData
    > MapKit
    > SpriteKit
    > AVFoundation
    > Core Media
    > Media Player
    > Many, many more
    

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13. COMMONLY USED IOS FRAMEWORKS
    ALREADY ON WATCHOS
    > Foundation
    > Core Motion
    > Core Location
    > CoreData
    > HealthKit
    > HomeKit
    > PassKit
    > Contacts
    

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14. COMMONLY USED IOS FRAMEWORKS
    ALREADY ON OS X
    > Foundation
    > CoreData
    > Contacts
    > AddressBook
    

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15. OVERLAPPING
    FRAMEWORKS
    ENABLE US TO
    SHARE CODE
    

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16. SHARING CODE
    1. Reduces redundancy
    2. Avoids duplicate tests and documentation
    3. Makes your code more modular
    

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17. EXAMPLE
    GILT APP FOR OS X,
    IOS, WATCHOS, AND
    TVOS
    

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18. STEPS
    1. Write an API Wrapper Framework -> GiltKit
    2. Create a new target and add the
    appropriate OS specific UI logic for each OS
    3. Add GiltKit to each target and use it to
    display a list of upcoming sales.
    

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19. GILTKIT HEADER PREVIEW
    public struct Client {
    public init(session: NSURLSession = default)
    public func listSalesForStore(store: GiltKit.Store, kind: GiltKit.Sale.Kind, completion: (([GiltKit.Sale]) -> ()))
    }
    public struct Sale {
    public enum Kind : String {
    case Upcoming
    case Active
    }
    public let name: String
    public let description: String
    public let imageURL: NSURL
    public let size: UInt
    public let store: GiltKit.Store
    }
    public enum Store : String {
    case Men
    case Women
    case Kids
    case Home
    }
    

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21. SHARING
    CODE IS
    POWERFUL
    

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22. THANK YOU
    @DASMERSINGH
    HTTP://GITHUB.COM/DASMER/
    GILTKIT
    

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