Swift Intro - Speaker Deck

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Swift

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@ﬂorianbuerger

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“Writing code is interactive and fun”

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

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Variablen

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var // mutable let // constant

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var // mutable let // constant

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Typableitung

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let implicitDouble = 70.0 let explicitDouble:Double = 70

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Keine (implizite) Konvertierung

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

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

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

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Funktionen

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

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

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Optionals

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var name :String?

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

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

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

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

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

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

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

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class Controller { var title: String! }

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var server: Server! Implicitly Unwrapped Optional Type

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var server: Server!

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Collections

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

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[key:object] ["key":"value"]

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

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

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

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

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

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

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

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

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

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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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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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Closures

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fuckingclosuresyntax.com

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

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

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

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

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

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

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

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

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Singleton

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

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Konstante public

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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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structs support static constants

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

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Properties

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

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

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

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

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