Swift Intro

A short introduction and tidbits for the new programming language from Apple called Swift. I talked about this at our monthly mobile development user group meet up in Stuttgart (http://mobilemaultaschen.de)

Transcript

1. Swift
   

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2. @florianbuerger
   

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3. “Writing code is
   interactive
   and fun”
   

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4. “Swift is ready for
   your next iOS and
   OS X project”
   

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5. Variablen
   

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6. var // mutable
   let // constant
   

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7. var // mutable
   let // constant
   

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8. Typableitung
   

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9. let implicitDouble = 70.0
   let explicitDouble:Double = 70
   

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10. Keine
    (implizite)
    Konvertierung
    

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11. let first = "First "
    let nine = 9
    let patch = first + nine
    

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12. let first = "First "
    let nine = 9
    let patch = first + nine
    'String' is not convertible to 'UInt8'
    

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13. let first = "First "
    let nine = 9
    let patch = first + String(nine)
    "First 9"
    

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14. Funktionen
    

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15. func sayHello(personName: String) -> String
    {
    let greeting = "Hello, " + personName
    return greeting
    }
    

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16. func deleteServer(server: Server) -> (Bool, NSError?)
    { }
    

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17. Optionals
    

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18. var name :String?
    

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19. R.I.P
    if (!object) { }
    

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20. R.I.P
    if (!object) { }
    Bedingung muss Bool zurückliefern
    

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21. var optionalName: String? =
    "John Appleseed"
    !
    var greeting = "Hello!"
    if let name = optionalName {
    greeting = "Hello, \
    (name)"
    }
    

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22. var optionalName: String? =
    "John Appleseed"
    !
    var greeting = "Hello!"
    if let name = optionalName {
    greeting = "Hello, \
    (name)"
    }
    

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23. var optionalName: String? =
    "John Appleseed"
    !
    var greeting = "Hello!"
    if let name = optionalName {
    greeting = "Hello, \
    (name)"
    }
    

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24. class Controller {
    var title: String
    }
    ! Class 'Controller' has no initializers
    

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25. class Controller {
    var title: String?
    }
    'String?' does not have a
    member named 'isEmpty'
    

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26. class Controller {
    var title: String!
    }
    
    

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27. var server: Server!
    Implicitly
    Unwrapped
    Optional Type
    

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28. var server: Server!
    

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29. Collections
    

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30. [Int]
    [1, 2, 3, 4]
    

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31. [key:object]
    ["key":"value"]
    

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32. var ints = [1,2]
    ints += 3
    !
    // [1,2,3]
    

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33. var servers =
    [Server]()
    (...)
    let aServer = (...)
    servers += aServer
    

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34. class Server: NSObject,
    Equatable, NSCoding {
    var gooRequests = 0
    var badRequests = 0
    var alias: NSString
    var url: NSURL
    (...)
    }
    

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35. var servers =
    [Server]()
    (...)
    let aServer = (...)
    servers += aServer
    

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36. func == (lhs: Server,
    rhs: Server) -> Bool
    {
    return
    lhs.alias == rhs.alias
    && lhs.url == rhs.url
    }
    

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37. func == (lhs: Server,
    rhs: Server) -> Bool
    {
    return
    lhs.alias == rhs.alias
    && lhs.url == rhs.url
    }
    

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38. func == (lhs: Server,
    rhs: Server) -> Bool
    {
    return
    lhs.alias == rhs.alias
    && lhs.url == rhs.url
    }
    

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39. protocol Equatable {
    func ==(lhs: Self, rhs: Self) -> Bool
    }
    

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40. protocol Equatable {
    func ==(lhs: Self, rhs: Self) -> Bool
    }
    

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41. protocol Comparable : Equatable {
    func <=(lhs: Self, rhs: Self) -> Bool
    func >=(lhs: Self, rhs: Self) -> Bool
    func >(lhs: Self, rhs: Self) -> Bool
    }
    

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42. protocol Comparable : Equatable {
    func <=(lhs: Self, rhs: Self) -> Bool
    func >=(lhs: Self, rhs: Self) -> Bool
    func >(lhs: Self, rhs: Self) -> Bool
    }
    

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43. Closures
    

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44. fuckingclosuresyntax.com
    

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45. // Variable
    var closureName:
    (parameterTypes) -> (returnType)
    

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46. // Typealias
    typealias closureType =
    (parameterTypes) -> (returnType)
    

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47. // Argument
    func({(parameterTypes) ->
    (returnType) in statements})
    

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48. // Parameter
    array.sort({ (item1: Int, item2:
    Int) -> Bool
    in
    return item1 < item2
    })
    

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49. // Parameter
    array.sort({ (item1: Int, item2:
    Int) -> Bool
    in
    return item1 < item2
    })
    

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50. // Parameter
    array.sort({ (item1: Int, item2:
    Int) -> Bool
    in
    return item1 < item2
    })
    

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51. // Parameter
    array.sort({ (item1: Int, item2:
    Int) -> Bool
    in
    return item1 < item2
    })
    

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52. // in kurz
    array.sort { $0 < $1 }
    

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53. Singleton
    

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54. let _SingletonASharedInstance =
    SingletonA()
    !
    class SingletonA {
    !
    class var sharedInstance : SingletonA {
    return _SingletonASharedInstance
    }
    !
    }
    

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55. Konstante
    public
    

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56. class Manager {
    class var sharedInstance :Manager {
    !
    struct Static {
    static let instance
    :Manager = ServerManager()
    }
    return Static.instance
    }
    }
    https://github.com/hpique/SwiftSingleton
    

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57. structs support
    static
    constants
    

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58. let _SingletonASharedInstance =
    SingletonA()
    !
    class Manager {
    !
    class var sharedInstance :Manager {
    return _SingletonASharedInstance
    }
    !
    } Private Konstanten (hoffentlich) in
    nächster Version
    

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59. Properties
    

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60. class Controller {
    var title: String = "aTitle" {
    !
    willSet(newTitle) {
    println("About to set
    title to \(newTitle)")
    }
    !
    }
    }
    

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61. class Controller {
    (...)
    didSet {
    println("Changed
    title \(oldValue) to \(title)")
    }
    (...)
    

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62. !
    let controller = Controller()
    controller.title = "Hello"
    !
    // Console output
    About to set title to Hello
    Changed title aTitle to Hello
    

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63. “The Swift Programming
    Language”
    !
    https://itunes.apple.com/de/book/swift-
    programming-language/id881256329?
    l=en&mt=11
    

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64. “Using Swift with Cocoa
    and Objective-C”
    !
    https://itunes.apple.com/de/book/using-
    swift-cocoa-objective/id888894773?l=en&mt=11
    

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65. Follow the Swift
    engineers
    (e.g. Chris Lattner)
    !
    https://twitter.com/olebegemann/status/
    482274302805700608
    

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