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Swift Workshop
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puls
June 10, 2014
Technology
2
330
Swift Workshop
What you need to know about Apple's new language.
puls
June 10, 2014
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Transcript
Swift Workshop June 10th, 2014
None
3 Swift is quite like Objective-C.
Native on iOS and OS X
Full support for all Cocoa and low-level APIs
Xcode- and LLVM-based workflow
Seamless bridging to Objective-C
Automatic Reference Counting
Named method parameters
Classes, Structs, Protocols, Enums
Closures
Int / Int32 / Int64 / UInt / UInt32 /
UInt64
if / for / while / do…while / switch
Swift is quite unlike Objective-C.
Not a superset of C
override func
Range operator
Range operator for i in 1..3 { print(i) } //
prints 12 for i in 1...3 { print(i) } // prints 123
Getters and setters
class Person { var firstName : String = "" var
lastName : String = "" var fullName : String { get { return "\(firstName) \(lastName)" } set { let parts = newValue.componentsSeparatedByString(" ") firstName = parts[0] lastName = parts[1] } } } Getters and setters
No default fallthrough on switch
Static type system
enum ComparisonResult { case Ascending case Equal case Descending }
! typealias Comparator = (Int, Int) -> ComparisonResult func sortArray(array : Int[], compareFunction : Comparator) { // ... } Static type system
Generics
enum ComparisonResult { case Ascending case Equal case Descending }
! func sortArray<T>(array : T[], compareFunction : (T, T) -> ComparisonResult) { // ... } Generics
Parameterized Enums
enum FlightStatus { case OnTime // Sweet case Delayed(Int) //
Oh well case UnitedAirlines // Should have known } Parameterized Enums
Structs with behavior
struct Rect { let height : Double let width :
Double var area : Double { return height * width } } ! let r = Rect(height: 4, width: 8) r.area // 32.0 Structs with behavior
Tuples
Pattern Matching
let a : Any = 124 let b = 346
! switch (a, b) { case (_, 345): println("b is 345") case (is Int, _): println("a is Int") default: println("nothing matched") } Pattern Matching
Constants and variables
let a = 1 var b = 2 b =
3 a = 3 // error ! let c = [1,2,3] // fixed-size array var d = [1,2,3] // mutable array c += 4 // error d += 4 ! c[1] = 4 // this works, though Constants and variables
Default parameter values
func madLibs(a : String, b : String = "Second", c
: String = "Third") { println("\(a) then \(b) then \(c)") } madLibs("foo", b: "bar", c: "baz") madLibs("yep") Default parameter values
Operator overloading
Subscripting
extension Int { subscript(index : Int) -> Int { get
{ return self % index } } } Subscripting
Value types
“Trailing closure” syntax
extension Int { func times(closure : () -> ()) {
for _ in 0..self { closure() } } } ! 3.times() { println("Swift is the best!") } “Trailing closure” syntax
Syntactic sugar
var numbers = [1,5,2,9,3,4,6,8,7] Syntactic sugar
var numbers = [1,5,2,9,3,4,6,8,7] numbers.sort({ a, b in a <
b }) Syntactic sugar
var numbers = [1,5,2,9,3,4,6,8,7] numbers.sort({ a, b in a <
b }) numbers.sort { a, b in a < b } Syntactic sugar
var numbers = [1,5,2,9,3,4,6,8,7] numbers.sort({ a, b in a <
b }) numbers.sort { a, b in a < b } numbers.sort { $0 < $1 } Syntactic sugar
var numbers = [1,5,2,9,3,4,6,8,7] numbers.sort({ a, b in a <
b }) numbers.sort { a, b in a < b } numbers.sort { $0 < $1 } numbers.sort(<) Syntactic sugar
Optionals
var a : Int? var b : Int ! a
// nil a = 1 // {Some 1} a + 2 // this is an error a! + 2 // 3 b = 2 // 2 b + 2 // 4 Optionals
Playgrounds
Practical Swift
Value types vs. Reference types
Structs vs. Classes
Array vs. NSArray
array.unshare()
http://terribleswiftideas.tumblr.com
http://developer.apple.com/swift
None
None