Downloaded 41 times
![// Lazy initialization
class DataImporter {
}
class DataManager {
lazy var importer = DataImporter()
var data = [String]()
}
let m = DataManager()
// importer has not yet been created
m.data.append("Element 1");
m.data.append("Element 2");
m.data.append("Element 3");
// Initialize on first access
m.importer.import();](https://image.slidesharecdn.com/d8wqmtfytqgddvlfpyp5-signature-ff431a1a4451113dca1a13a490535431743e0cf9bcf2bbbb32a64de742254b36-poli-150402090047-conversion-gate01/75/Deep-Dive-Into-Swift-39-2048.jpg)
![Closures
// Closures
var cities = ["New Delhi", "Trivandrum", "Kochi", "Bangalore"]
// Sort with delegates
cities.sort({ (a, b) -> Bool in
a < b
})](https://image.slidesharecdn.com/d8wqmtfytqgddvlfpyp5-signature-ff431a1a4451113dca1a13a490535431743e0cf9bcf2bbbb32a64de742254b36-poli-150402090047-conversion-gate01/75/Deep-Dive-Into-Swift-48-2048.jpg)
![Closures - Trailing spaces
// Closures
var cities = ["New Delhi", "Trivandrum", "Kochi", "Bangalore"]
// Sort with delegates
cities.sort({ (a, b) -> Bool in
a < b
})](https://image.slidesharecdn.com/d8wqmtfytqgddvlfpyp5-signature-ff431a1a4451113dca1a13a490535431743e0cf9bcf2bbbb32a64de742254b36-poli-150402090047-conversion-gate01/75/Deep-Dive-Into-Swift-49-2048.jpg)
![Closures - Parentheses
// Closures
var cities = ["New Delhi", "Trivandrum", "Kochi", "Bangalore"]
// Sort with delegates
cities.sort { (a, b) -> Bool in
a < b
}](https://image.slidesharecdn.com/d8wqmtfytqgddvlfpyp5-signature-ff431a1a4451113dca1a13a490535431743e0cf9bcf2bbbb32a64de742254b36-poli-150402090047-conversion-gate01/75/Deep-Dive-Into-Swift-50-2048.jpg)
![Closures - Type inference
// Closures
var cities = ["New Delhi", "Trivandrum", "Kochi", "Bangalore"]
// Sort with delegates
cities.sort { (a, b) -> Bool in
a < b
}](https://image.slidesharecdn.com/d8wqmtfytqgddvlfpyp5-signature-ff431a1a4451113dca1a13a490535431743e0cf9bcf2bbbb32a64de742254b36-poli-150402090047-conversion-gate01/75/Deep-Dive-Into-Swift-51-2048.jpg)
![Closures - Type inference
// Closures
var cities = ["New Delhi", "Trivandrum", "Kochi", "Bangalore"]
// Sort with delegates
cities.sort { a, b -> Bool in
a < b
}](https://image.slidesharecdn.com/d8wqmtfytqgddvlfpyp5-signature-ff431a1a4451113dca1a13a490535431743e0cf9bcf2bbbb32a64de742254b36-poli-150402090047-conversion-gate01/75/Deep-Dive-Into-Swift-52-2048.jpg)
![Closures - Implicit return
// Closures
var cities = ["New Delhi", "Trivandrum", "Kochi", "Bangalore"]
// Sort with delegates
cities.sort { a, b in
a < b
}](https://image.slidesharecdn.com/d8wqmtfytqgddvlfpyp5-signature-ff431a1a4451113dca1a13a490535431743e0cf9bcf2bbbb32a64de742254b36-poli-150402090047-conversion-gate01/75/Deep-Dive-Into-Swift-53-2048.jpg)
![Closures - Positional
Parameters
// Closures
var cities = ["New Delhi", "Trivandrum", "Kochi", "Bangalore"]
// Sort with delegates — Positional parameters
cities.sort { $0 < $1 }](https://image.slidesharecdn.com/d8wqmtfytqgddvlfpyp5-signature-ff431a1a4451113dca1a13a490535431743e0cf9bcf2bbbb32a64de742254b36-poli-150402090047-conversion-gate01/75/Deep-Dive-Into-Swift-54-2048.jpg)
![Closures - Operator as
closure
// Closures
var cities = ["New Delhi", "Trivandrum", "Kochi", "Bangalore"]
// Sounds interesting?
cities.sort( < )](https://image.slidesharecdn.com/d8wqmtfytqgddvlfpyp5-signature-ff431a1a4451113dca1a13a490535431743e0cf9bcf2bbbb32a64de742254b36-poli-150402090047-conversion-gate01/75/Deep-Dive-Into-Swift-55-2048.jpg)
![// Generic Type
struct Stack<T> {
var items = [T]()
mutating func push(item: T) {
items.append(item)
}
mutating func pop() -> T {
return items.removeLast()
}
}](https://image.slidesharecdn.com/d8wqmtfytqgddvlfpyp5-signature-ff431a1a4451113dca1a13a490535431743e0cf9bcf2bbbb32a64de742254b36-poli-150402090047-conversion-gate01/75/Deep-Dive-Into-Swift-105-2048.jpg)
![// Type constraints
func findIndex<T: Equatable>( array: [T], valueToFind: T) -> Int? {
for(index, value) in enumerate(array) {
if value == valueToFind {
return index
}
}
return nil
}](https://image.slidesharecdn.com/d8wqmtfytqgddvlfpyp5-signature-ff431a1a4451113dca1a13a490535431743e0cf9bcf2bbbb32a64de742254b36-poli-150402090047-conversion-gate01/75/Deep-Dive-Into-Swift-107-2048.jpg)
Uploaded bySarath C
Deep Dive Into Swift
The document discusses the Swift programming language, its history, and key features introduced by Chris Lattner in 2010. It covers advanced programming concepts such as enumerations, properties, closures, optionals, initializers, protocols, and generics, highlighting their benefits for productivity and performance. The summary emphasizes Swift's adoption and its modern compiler optimizations influenced by other languages.
More Related Content
Deep Dive Into Swift
- 1.
- 2.
- 3. A bit ofhistory
- 4. Chris Lattner • Authorof the original LLVM tool chain project • Started working on Swift in 2010 • A research intern at Microsoft Research • Leads Development Tool Effort at Apple
- 5.
- 6.
- 7. Influenced by Python, Ruby,Objective-C, C# etc.
- 8.
- 9.
- 10.
- 11.
- 12. REPL (Read-Eval-Print-Loop) - Writeit in lldb when program runs - Use xcrun swift to run externally
- 13.
- 14. can deploy toprevious version of iOS and OS X
- 15.
- 16. – The RedMonkProgramming Language Rankings: January 2015 “Swift has gone from our 68th ranked language during Q3 to number 22 this quarter, a jump of 46 spots.”
- 17.
- 18.
- 19.
- 20.
- 23.
- 24.
- 25. enum CompassPoint { caseNorth case South case East case West }
- 26. enum CompassPoint { caseNorth case South case East case West } var directionToHead = CompassPoint.East; directionToHead = .East;
- 27. enum CompassPoint { caseNorth case South case East case West } var directionToHead = CompassPoint.East; directionToHead = .East; switch(directionToHead) { case .East: println( "Heading east") case .West: println( "Heading West") case .North: println( "Heading North") case .South: println( "Heading South") default: println("Nowhere to go") }
- 28.
- 29. Enumerations can storeassociated values of any given type. The type can be different for each member in the enumeration
- 30. // Associated ValuesExamples enum Barcode { case UPCA(Int, Int, Int, Int) case QRCode(String) }
- 31. // Associated ValuesExamples enum Barcode { case UPCA(Int, Int, Int, Int) case QRCode(String) } var productBarcode = Barcode.UPCA(8, 85909, 51226, 3) productBarcode = .QRCode("ABCDEFGHIJ")
- 32. // Associated ValuesExamples enum Barcode { case UPCA(Int, Int, Int, Int) case QRCode(String) } var productBarcode = Barcode.UPCA(8, 85909, 51226, 3) productBarcode = .QRCode("ABCDEFGHIJ") let numberSystem = 8, manufacturer = 85909, product = 51226, check = 3 switch productBarcode { case let .UPCA(numberSystem, manufacturer, product, check) println("UPCA Detected") case let .QRCode("ABCDEFGHIJ") println("QRCode detected") }
- 33.
- 34. // Pattern Matchingwith Switch-Case let x = 9 switch(x) { case 1...5: // Closed range operator println( "Range - 1,2,3,4,5") case 6..<10: // Half closed range operator println( "Range - 6,7,8,9") default: println("Default") }
- 35.
- 36. associates values with classes,structure or enumerations
- 37. Stored Properties store constantand variable values
- 38. Lazy Stored Properties •Initializes on first time access • Declared with lazy keyword • Lazy Stored properties can’t be a constant; for obvious reasons • Useful when the initial values are depends on outside factors
- 39. // Lazy initialization classDataImporter { } class DataManager { lazy var importer = DataImporter() var data = [String]() } let m = DataManager() // importer has not yet been created m.data.append("Element 1"); m.data.append("Element 2"); m.data.append("Element 3"); // Initialize on first access m.importer.import();
- 40. Computed Properties computes avalue (rather than store)
- 41. // Computed properties classRectangle { var height = 0 var width = 0 var area : Int { get { return height * width } } }
- 42.
- 43. // Property Observers classTemperature { var current : Int = 26 { willSet { println("(newValue)"); // Prints 32 } didSet { println("(oldValue)"); // Prints 26 } } } var obj = Temperature() obj.current = 32;
- 44.
- 45.
- 46. Self-contained blocks of functionalitythat can be passed around and used in your code.
- 47. Similar to blocksin Objective-C
- 48. Closures // Closures var cities= ["New Delhi", "Trivandrum", "Kochi", "Bangalore"] // Sort with delegates cities.sort({ (a, b) -> Bool in a < b })
- 49. Closures - Trailingspaces // Closures var cities = ["New Delhi", "Trivandrum", "Kochi", "Bangalore"] // Sort with delegates cities.sort({ (a, b) -> Bool in a < b })
- 50. Closures - Parentheses //Closures var cities = ["New Delhi", "Trivandrum", "Kochi", "Bangalore"] // Sort with delegates cities.sort { (a, b) -> Bool in a < b }
- 51. Closures - Typeinference // Closures var cities = ["New Delhi", "Trivandrum", "Kochi", "Bangalore"] // Sort with delegates cities.sort { (a, b) -> Bool in a < b }
- 52. Closures - Typeinference // Closures var cities = ["New Delhi", "Trivandrum", "Kochi", "Bangalore"] // Sort with delegates cities.sort { a, b -> Bool in a < b }
- 53. Closures - Implicitreturn // Closures var cities = ["New Delhi", "Trivandrum", "Kochi", "Bangalore"] // Sort with delegates cities.sort { a, b in a < b }
- 54. Closures - Positional Parameters //Closures var cities = ["New Delhi", "Trivandrum", "Kochi", "Bangalore"] // Sort with delegates — Positional parameters cities.sort { $0 < $1 }
- 55. Closures - Operatoras closure // Closures var cities = ["New Delhi", "Trivandrum", "Kochi", "Bangalore"] // Sounds interesting? cities.sort( < )
- 56.
- 57.
- 58.
- 59. // Age canbe nil var age : Int? age = response.parse()
- 60.
- 61. var age :Int? age = response.parse() let x = age! // Your program would crash if you unwrap a nil value
- 62.
- 63. class Person { varresidence : Residence? } class Residence { var address : Address? } class Address { var buildingNumber : String? var streetName : String? var apartmentNumber : String? }
- 64. // Optional Binding iflet home = paul.residence { if let postalAddress = home.address { if let building = postalAddress.buildingNumber { // Code } } }
- 65.
- 66. // Optional Chaining letbuildingNumber = paul.residence?.address?.buildingNumber
- 67. // optional chaining+ bind + unwrap if let buildingNumber = paul.residence?.address?.buildingNumber { }
- 68.
- 69.
- 70. designated initializers areprimary initializers of a class a class must have at least one designated initializer classes tend to have few designated initializers
- 71. convenience initializers are secondary;supporting initializers of a class
- 72. class Food { varname: String // Designated Initializer init(name: String) { self.name = name } // Convenience Initializer convenience init() { self.init(name: "Unnamed") } }
- 73. class Food { varname: String // Designated Initializer init(name: String) { self.name = name } // Convenience Initializer convenience init() { self.init(name: "Unnamed") } }
- 74. class Food { varname: String // Designated Initializer init(name: String) { self.name = name } // Convenience Initializer convenience init() { self.init(name: "Unnamed") } }
- 75.
- 76. class Vehicle { letnumberOfWheels = 0 } class Bicycle : Vehicle { override init() { super.init() numberOfWheels = 2 } } class Car : Vehicle { override init() { super.init() numberOfWheels = 4 } }
- 77. class Vehicle { letnumberOfWheels = 0 } class Bicycle : Vehicle { override init() { super.init() numberOfWheels = 2 } } class Car : Vehicle { override init() { super.init() numberOfWheels = 4 } }
- 78. class Vehicle { letnumberOfWheels = 0 } class Bicycle : Vehicle { override init() { super.init() numberOfWheels = 2 } } class Car : Vehicle { override init() { super.init() numberOfWheels = 4 } }
- 79. class Vehicle { letnumberOfWheels = 0 } class Bicycle : Vehicle { override init() { super.init() numberOfWheels = 2 } } class Car : Vehicle { override init() { super.init() numberOfWheels = 4 } }
- 80.
- 81. helps you toattach functionality data types; even to the ones you didn’t create!
- 82. // Extension asinstance method extension Int { func plusOne() -> Int { return self + 1 } } var i = 5 i.plusOne() 10.plusOne()
- 83. // Extension asinstance method extension Int { func plusOne() -> Int { return self + 1 } } var i = 5 i.plusOne() 10.plusOne()
- 84. // Extension asinstance method extension Int { func plusOne() -> Int { return self + 1 } } var i = 5 i.plusOne() 10.plusOne()
- 85. // Extension asproperty extension Double { var km : Double { return self*1000.0 } var m : Double { return self } var cm : Double { return self / 100.0 } var mm : Double { return self / 10000.0 } var ft : Double { return self / 3.28084 } } let threeFeet = 3.ft // Meters let oneInch = 25.4.mm // Meters
- 86. // Extension asproperty extension Double { var km : Double { return self*1000.0 } var m : Double { return self } var cm : Double { return self / 100.0 } var mm : Double { return self / 10000.0 } var ft : Double { return self / 3.28084 } } let threeFeet = 3.ft // Meters let oneInch = 25.4.mm // Meters
- 87. // Extension asproperty extension Double { var km : Double { return self*1000.0 } var m : Double { return self } var cm : Double { return self / 100.0 } var mm : Double { return self / 10000.0 } var ft : Double { return self / 3.28084 } } let threeFeet = 3.ft // Meters let oneInch = 25.4.mm // Meters
- 88. // Extension asclass method extension UIColor { class func chilliRed() -> UIColor { return UIColor(red: 94/255, green: 25/255, blue: 33/255, alpha: 1) } } var chilliRed = UIColor.chilliRed()
- 89. // Extension asclass method extension UIColor { class func chilliRed() -> UIColor { return UIColor(red: 94/255, green: 25/255, blue: 33/255, alpha: 1) } } var chilliRed = UIColor.chilliRed()
- 90. // Extension asclass method extension UIColor { class func chilliRed() -> UIColor { return UIColor(red: 94/255, green: 25/255, blue: 33/255, alpha: 1) } } var chilliRed = UIColor.chilliRed()
- 91.
- 92.
- 93. class ViewController: UIViewController,FBLoginViewDelegate { }
- 94. class ViewController: UIViewController,FBLoginViewDelegate { } Class
- 95. class ViewController: UIViewController,FBLoginViewDelegate { } ProtocolClass
- 96. protocol LoginProtocol { funcloginSuccessful() func loginFailed() } class ViewController : LoginProtocol { func loginFailed() { // code } func loginSuccessful() { // code } }
- 97. protocol LoginProtocol { varsomeProperty : Int { get set } func loginSuccessful() func loginFailed() } class ViewController : LoginProtocol { func loginFailed() { // code } func loginSuccessful() { // code } var someProperty : Int = 0 { willSet { // Update UI with newValue } didSet { // code } } }
- 98. protocol LoginProtocol { varsomeProperty : Int { get set } func loginSuccessful() func loginFailed() } class ViewController : LoginProtocol { func loginFailed() { // code } func loginSuccessful() { // code } var someProperty : Int = 0 { willSet { // Update UI with newValue } didSet { // code } } }
- 99. protocol LoginProtocol { varsomeProperty : Int { get set } func loginSuccessful() func loginFailed() } class ViewController : LoginProtocol { func loginFailed() { // code } func loginSuccessful() { // code } var someProperty : Int = 0 { willSet { // Update UI with newValue } didSet { // code } } }
- 100. protocol LoginProtocol { varsomeProperty : Int { get set } func loginSuccessful() func loginFailed() } class ViewController : LoginProtocol { func loginFailed() { // code } func loginSuccessful() { // code } var someProperty : Int = 0 { willSet { // Update UI with newValue } didSet { // code } } }
- 101.
- 102. func swapInt(inout a:Int,inout b:Int) { let t = a; a = b; b = t } func swapString(inout a:String, inout b:String) { let t = a; a = b; b = t } var a = 10, b = 20 swapInt(&a, &b) var p = "iOS 7", q = "iOS 8" swapString(&p,&q)
- 103. func swapInt(inout a:Int,inout b:Int) { let t = a; a = b; b = t } func swapString(inout a:String, inout b:String) { let t = a; a = b; b = t } var a = 10, b = 20 swapInt(&a, &b) var p = "iOS 7", q = "iOS 8" swapString(&p,&q) // MARK: With Generics func Swap <T> (inout a: T, inout b: T) { let t = a; a = b; b = t } Swap(&a, &b); Swap(&p, &q);
- 104. func swapInt(inout a:Int,inout b:Int) { let t = a; a = b; b = t } func swapString(inout a:String, inout b:String) { let t = a; a = b; b = t } var a = 10, b = 20 swapInt(&a, &b) var p = "iOS 7", q = "iOS 8" swapString(&p,&q) // MARK: With Generics func Swap <T> (inout a: T, inout b: T) { let t = a; a = b; b = t } Swap(&a, &b); Swap(&p, &q);
- 105. // Generic Type structStack<T> { var items = [T]() mutating func push(item: T) { items.append(item) } mutating func pop() -> T { return items.removeLast() } }
- 106. // Stack fromsomewhere class Stack<T> { } // Extension extension Stack { func top() -> T? { return nil } }
- 107. // Type constraints funcfindIndex<T: Equatable>( array: [T], valueToFind: T) -> Int? { for(index, value) in enumerate(array) { if value == valueToFind { return index } } return nil }
- 108.
- 109. Structures and enumerationsare value types. By default, the properties of a value type cannot be modified from within its instance methods.
- 110. // Immutatbility andMutating struct Point { var x = 0.0, y = 0.0 // No change in the actual object func pointByScaling(factor: Double) -> Point { return Point(x: self.x*factor, y: self.y*factor) } // Function modifies the object mutating func scale(factor : Double) { self.x *= factor self.y *= factor } }
- 111. // Immutatbility andMutating struct Point { var x = 0.0, y = 0.0 // No change in the actual object func pointByScaling(factor: Double) -> Point { return Point(x: self.x*factor, y: self.y*factor) } // Function modifies the object mutating func scale(factor : Double) { self.x *= factor self.y *= factor } }
- 112. // Immutatbility andMutating struct Point { var x = 0.0, y = 0.0 // No change in the actual object func pointByScaling(factor: Double) -> Point { return Point(x: self.x*factor, y: self.y*factor) } // Function modifies the object mutating func scale(factor : Double) { self.x *= factor self.y *= factor } }
- 113.
- 114. struct Vector2D { varx = 0.0, y = 0.0 } func + (left:Vector2D, right:Vector2D) -> Vector2D { return Vector2D(x: left.x + right.x, y: left.y + right.y) } // Compound Operator func += (inout left:Vector2D, right:Vector2D) { left.x += right.x left.y += right.y } var vector = Vector2D(x: 3.0, y: 1.0) let anotherVector = Vector2D(x: 2.0, y: 4.0) let combinedVector = vector + anotherVector vector += anotherVector
- 115. struct Vector2D { varx = 0.0, y = 0.0 } func + (left:Vector2D, right:Vector2D) -> Vector2D { return Vector2D(x: left.x + right.x, y: left.y + right.y) } // Compound Operator func += (inout left:Vector2D, right:Vector2D) { left.x += right.x left.y += right.y } var vector = Vector2D(x: 3.0, y: 1.0) let anotherVector = Vector2D(x: 2.0, y: 4.0) let combinedVector = vector + anotherVector vector += anotherVector
- 116. struct Vector2D { varx = 0.0, y = 0.0 } func + (left:Vector2D, right:Vector2D) -> Vector2D { return Vector2D(x: left.x + right.x, y: left.y + right.y) } // Compound Operator func += (inout left:Vector2D, right:Vector2D) { left.x += right.x left.y += right.y } var vector = Vector2D(x: 3.0, y: 1.0) let anotherVector = Vector2D(x: 2.0, y: 4.0) let combinedVector = vector + anotherVector vector += anotherVector
- 117. struct Vector2D { varx = 0.0, y = 0.0 } func + (left:Vector2D, right:Vector2D) -> Vector2D { return Vector2D(x: left.x + right.x, y: left.y + right.y) } // Compound Operator func += (inout left:Vector2D, right:Vector2D) { left.x += right.x left.y += right.y } var vector = Vector2D(x: 3.0, y: 1.0) let anotherVector = Vector2D(x: 2.0, y: 4.0) let combinedVector = vector + anotherVector vector += anotherVector
- 118. struct Vector2D { varx = 0.0, y = 0.0 } // Custom operator - Doubling prefix operator +++ {} prefix func +++ (inout vector: Vector2D) -> Vector2D { vector += vector return vector } let doubled = +++vector
- 119. struct Vector2D { varx = 0.0, y = 0.0 } // Custom operator - Doubling prefix operator +++ {} prefix func +++ (inout vector: Vector2D) -> Vector2D { vector += vector return vector } let doubled = +++vector
- 120. struct Vector2D { varx = 0.0, y = 0.0 } // Custom operator - Doubling prefix operator +++ {} prefix func +++ (inout vector: Vector2D) -> Vector2D { vector += vector return vector } let doubled = +++vector
- 121. operators are only allowedin global scope
- 122.
- 123.
- 125.
- 126. References • The SwiftProgramming Language - iBooks • Using Swift with Objective-C and Cocoa - iBooks • WWDC 2014 Sessions on Swift • Developing iOS 8 Apps with Swift - iTunesU - Stanford