Swift School #4

Swift Школа
Сергей Пронин, Александр Зимин
Empatika

План
• Swift - Перегрузка операторов
• iOS8 - App Groups
• iOS8 - Extensions
• iOS8 - Handoff

Перегрузка операторов

<Модификатор> operator <операция> {
<Свойства>
}

Модификаторы операций
infix
Модификатор инфикс операции
Выполняется для двух объектов
Пример: a + b
prefix
Модификатор префиксов операции
Выполняется для одного объекта
Пример: !flag
postfix
Модификатор постфиксной операции
Выполняется для одного объекта
Пример: i++

Свойства операций
Precedence (UInt8)
Приоритет операции
Чем больше, тем приоритетнее
Числа от 0 до 255
Базовое значение - 100
Associativity
Ассоциативность операции
Может быть left, right, none
Assignment
Присвоение
Используется для операций формата =
Только для infix операций

Приоритет
infix operator >+ {
precedence 40
}
func >+ (left: Double, right: Double) -> Double {
return left + right
}
infix operator >* {
precedence 30
}
func >* (left: Double, right: Double) -> Double {
return left * right
}
let value = 10 >+ 5 >* 2 // 30

Ассоциативность
infix operator >- {
associativity left
}
func >- (left: Double, right: Double) -> Double {
return left - right
}
infix operator >/ {
associativity left
}
func >/ (left: Double, right: Double) -> Double {
return left / right
}
let nValue = 10 >- 4 >/ 2 // 3
let anotherValue = 10 >/ 2 >- 4 // 1

infix operator **= {
precedence 120
assignment
}
func **= (inout left: Double, right: Double) -> Double {
left = left * right
return left
}
infix operator ** {
associativity left
}
func ** (left: Double, right: Double) -> Double {
return left * right
}
infix operator +++ {
associativity left
}
func +++ (left: Double, right: Double) -> Double {
return left + right
}
var x = 3 +++ 4 ** 5
let y = x **= 2 ** 4
y
x

infix operator **= {
precedence 120
assignment
}
func **= (inout left: Double, right: Double) -> Double {
left = left * right
return left
}
infix operator ** {
associativity left
}
func ** (left: Double, right: Double) -> Double {
return left * right
}
infix operator +++ {
associativity left
}
func +++ (left: Double, right: Double) -> Double {
return left + right
}
var x = 3 +++ 4 ** 5 // 35.0
let y = x **= 2 ** 4
y // 280.0
x // 70

Перегрузка операторов для классов

struct Vector2D {
var x = 0.0, y = 0.0
}

func + (left: Vector2D, right: Vector2D) -> Vector2D {
return Vector2D(x: left.x + right.x, y: left.y + right.y)
}
let vectorSum1 = Vector2D(x: 1.0, y: 2.0)
let vectorSum2 = Vector2D(x: 0.5, y: -1.0)
let vectorSum3 = vectorSum1 + vectorSum2 // {x 1.5, t 1.0}

prefix func -(vector: Vector2D) -> Vector2D {
return Vector2D(x: -vector.x, y: -vector.y)
}
prefix func +(vector: Vector2D) -> Double {
return vector.x + vector.y
}
let minusVector = -vectorSum3 // {x -1.5, y -1.0}
let result = +vectorSum3 // 2.5

func += (inout left: Vector2D, right: Vector2D) {
left = left + right
}
var newVector = Vector2D(x: 1.0, y: 1.0) // {x 1.0, y 1.0}
newVector += Vector2D(x: 1.0, y: 2.0) // {x 2.0, y 3.0}
postfix func ++ (inout vector: Vector2D) -> Vector2D {
vector += Vector2D(x: 1.0, y: 1.0)
return vector
}
newVector++ // {x 3.0, y 4.0}
let updatedNewVector = newVector++ // {x 4.0, y 5.0}

infix operator ^^ {}
func ^^ (left: Double, right: Double) -> Double {
return pow(left, right)
}
5 ^^ 2 // 25.0
3 ^^ 5 // 243.0

App
extension
Containing Host app
app
Request
Response

App
extension
Host app
Containing
app
Request
Response
Open URL
Read/Write
Shared
resources
Read/Write

import NotificationCenter
class TodayViewController: UIViewController, NCWidgetProviding {
override func viewDidLoad() {
super.viewDidLoad()
self.preferredContentSize = CGSizeMake(320, 100)
}
//MARK: - NCWidgetProviding
func widgetPerformUpdateWithCompletionHandler(completionHandler:
(NCUpdateResult -> Void)!) {
// update widget and call handler: .Failed, .NoData, .NewData
completionHandler(NCUpdateResult.NewData)
}
func widgetMarginInsetsForProposedMarginInsets(
defaultMarginInsets: UIEdgeInsets) -> UIEdgeInsets {
return UIEdgeInsetsMake(8, 16, 8, 16)
}
}

func broadcastActivity() {
var activity = NSUserActivity(activityType: "com.empatika.activity1")
activity.addUserInfoEntriesFromDictionary([
"flight_id": self.currentFlight.flightId
])
activity.title = self.currentFlight.name
activity.delegate = self
activity.setNeedsSave(true)
activity.becomeCurrent()
}
// implement NSUserActivityDelegate
func userActivityWillSave(activity: NSUserActivity) {
activity.addUserInfoEntriesFromDictionary([
"flight_id": self.currentFlight.flightId
])
}
func userActivityWasContinued(activity: NSUserActivity) {
//another device picker up the activity!
}

// AppDelegate
func application(application: UIApplication,
continueUserActivity userActivity: NSUserActivity,
restorationHandler: [AnyObject] -> Void) -> Bool {
var flightIdOpt = userActivity.userInfo[“flight_id"]
as? String
if let flightId = flightIdOpt {
//load flight locally or remotely and show
}
//optional. if restoration is set up
restorationHandler(self.viewControllers)
return true //or false if can’t
}

Вопросы
swift@empatika.com
Дипломы

Swift School #4

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