Swift Школа

Сергей Пронин Empatika

План

• Интро

• Why Swift?

• Как подружить Objective-C и Swift?

ИнтроСергей Пронин

Ведущий разработчик Empatika Ведущий разработчик App in the Air Преподаватель НИУ-ВШЭ @spronin sergey@pronin.me

Why Swift?• Multiple return values

• Optionals -> Safety

• Playgrounds

• Extensions

• Powerful enums

• Sweet syntax

var variable: Double = 55 variable = 12 let constant = 42 //implicit Int

let str = "Answer is \(constant)"

var ar: [Int] = [1, 2, 3] var dic: [String: AnyObject] = ["key": "value", "num": 123]

for n in ar { if n % 2 == 0 { println(n) } }

for (key, value) in dic { println("\(key) -> \(value)") }

var optional: String? = "Hello?"

if let exists = optional { println(exists) }

if optional != nil { println(optional!) }

if optional?.hasSuffix("?") { println("somebody home?") }

let lang = "swift" switch (lang) { case "swift": println("young") case let x where x.hasSuffix("#"): println("wat?") case "js", "css": println("web") default: println("java, is it you?") }

//add <break> to exit clause //add <fallthrough> to fall through

for i in 0..<ar.count { //0...n = [0,n] println(ar[i]) }

for var i = 0; i < ar.count; i++ { println(ar[i]) }

do { fetchMessagesFromServer() sleep(5) } while true

while ar.count > 0 { ar.removeLast() }

func confession(name: String) -> String { return "I miss \(name)" }

confession("my mom")

func fl(a: [AnyObject]) -> (first: AnyObject, last: AnyObject) { return (a[0], a[a.count-1]) }

var result = fl(ar) println(result.first) println(result.1)

func params(numbers: Int…) -> Int { var sum = 0 for n in numbers { sum += n } return sum }

params(1, 1, 2, 3, 5, 8)

func isEven(n: Int) -> Bool { return n % 2 == 0 }

func filter(a: [Int], check: Int -> Bool) -> [Int] { var result: [Int] = [] for n in a { if check(n) { result.append(n) } } return result }

filter(0...10, isEven)

filter(0...10, { (item: Int) -> Bool in return item % 2 == 0 })

filter(0...100, { item in item % 10 == 0 })

filter(0...100, { $0 % 10 == 0 })

filter(0...100) { $0 % 10 == 0 }

class Shape { var sides = 0 var name: String

init(name: String) { self.name = name }

func description() -> String { return "Sides -> \(sides)" } }

var shape = Shape(name: "ama shape") shape.description()

class Triangle: Shape { var a, b, c: Int init(name: String, sides a: Int, _ b: Int, _ c: Int) { self.a = a self.b = b self.c = c super.init(name: name) self.sides = 3 } var perimeter: Int { get { return a + b + c } } override func description() -> String { return "Triangle with perimeter -> \(perimeter)" } }

var tr = Triangle(name: "Tr", sides: 5, 10, 20) tr.description

extension Shape {

class func plusFunction() -> String { return "I’m a class function " }

}

Shape.plusFunction()

struct StructShape { //all the same code, actually static func plusFunction() -> String { return "Passed by value" } } //struct objects are being passed by value //class objects are being passed by reference

enum Status: Int { case Undetermined, Success, Failure }

func sendRequest() -> Status { //networking magic return Status.Success }

var result = sendRequest() switch result { case .Success: println("success") case .Failure: println("failure") case .Undetermined: println("n/a") } result = Status.fromRaw(1)! //Success result.toRaw() //1

protocol NetworkingDelegate { func request(request: NSURLRequest, completedWithResult result: NSData?) }

class ServerHelper { var delegate: NetworkingDelegate? func doRequest(request: NSURLRequest) { var data = NSData(contentsOfURL: request.URL) delegate?.request(request, completedWithResult: data) } }

class Controller: NetworkingDelegate { func request(request: NSURLRequest, completedWithResult result: NSData?) { println("magic") }

let helper = ServerHelper() helper.delegate = Controller() let url = NSURL(string: "http://empatika.com") helper.doRequest(NSURLRequest(URL: url)))

Objective-C + Swift

Готовимся

typedef enum { StatusSuccess, StatusFailure } Status

typedef NS_ENUM(NSInteger, Status) { StatusSuccess, StatusFailure };

+ (id)sharedInstance { //your singleton magic }

+ (instancetype)sharedInstance { //singleton magic }

- (instancetype)init { //initial magic }

• В существующей Objective-C codebase -> New File - Cocoa Touch Class -> Swift ->Configure Header

• В созданный Bridging Header импортируем все, что Swift должен видеть из Obj-C#import “MyAFAPIClient.h”

• Чтобы Obj-C видел из Swift импортируем#import “ProductModuleName-Swift.h”

• Открыть Swift-классы и протоколы через @objc@objc(Venue)class Venue {…}

Перегнать модель или Controller на Swift

Начать новый проект на Swift с модели или

Controller-а