Swift 101

Introduction to Swift presented to students at UPR Rio Piedras on October 1, 2015.

Transcript

1. Swift 101 Axel Rivera
2. AXEL RIVERA FOUNDER STARTUP AFTER HOURS http://tiny.cc/afterhours twitter: @arivera
3. GITHUB github.com/riveralabs
4. FULL-TIME IOS DEVELOPER ENTERPRISE GOVERNMENT
5. Indie iOS Developer
6. My First Swift App Trade Size
8. TWO PARTS
9. PART 1 BASIC INTRODUCTION PLAYGROUNDS
10. PART 2 APP DEVELOPMENT & SAMPLE APP
11. The Swift Programming Language Free on iBooks
12. RAY WENDERLICH raywenderlich.com
14. TREEHOUSE teamtreehouse.com
15. print("Hello World!")
16. VARIABLES var deviceName: String = "iPhone 6" var systemVersion: Double = 8.0 var introduced: Int = 2014 var isAwesome: Bool = true
17. VARIABLES AND CONSTANTS let deviceName: String = "iPhone 6" var systemVersion: Double = 8.0 let introduced: Int = 2014 let isAwesome: Bool = true
18. TYPE INFERENCE let deviceName = "iPhone 6" // inferred as String var systemVersion = 8.0 // inferred as Double let introduced = 2014 // inferred as Int let isAwesome = true // inferred as Bool
19. STRING let myString = "This is a string" // inferred type String urlRequest.HTTPMethod = "GET" let components = "red,green,blue".componentsSeparatedByString(",") // ["blue", "green", "blue"]
20. STRING INTERPOLATION let x = 2, y = 10 let result = "\(x) times \(y) is \(x * y)" // 2 times 10 is 20
21. STRING MUTABILITY var variableString = "For every action" variableString += " there is a reaction" // "For every action there is a reaction" let constantString = "This will result" constantString += " in an errror!" // error - constantString cannot be changed
22. ARRAY AND DICTIONARY LITERALS var stocks = ["AAPL", "GOOG", "FB", "TWTR"] var numberOfWheels = ["car": 4, "bike": 2, "boat": 0]
23. ARRAY AND DICTIONARY WITH TYPES var stocks: [String] = ["AAPL", "GOOG", "FB", "TWTR"] var numberOfWheels: [String: Int] = ["car": 4, "bike": 2, "boat": 0]
24. EMPTY ARRAY AND DICTIONAIES var stocks = [String]() var numberOfWheels = [String: Int]()
25. MODIFYING ARRAYS var stocks = ["AAPL", "GOOG", "FB"] print(stocks[0]) // AAPL stocks += "TWTR" // ["AAPL", "GOOG", "FB", "TWTR"] stocks += ["MSFT", "YHOO"] // ["AAPL", "GOOG", "FB", "TWTR", "MSFT", "YHOO"]
26. MODIFYING DICTIONARIES var prices = ["AAPL": 100.11, "GOOG": 573.36, "FB": 79.00] print(prices["AAPL"]) // 100.11 prices["AAPL"] = 120.00 // ["AAPL": 120.00, "GOOG": 573.36, "FB": 79.00]
27. LOOPS while awake { code() } for var index = 0; index < 10; index++ { println("The current index is \(index)") }
28. FOR-IN for character in "Hello" { print(character) } let numbersArray = ["One", "Two", "Three"] for string in numbersArray { println("The current number is \(string)") } let numbersDictionary ["one": 1, "two": 2, "three": 3] for (key, value) in numbersDictionary { println("The current key is \(key) and value \(value)") }
29. FOR-IN: RANGES for number in 1...5 { println("\(number) x 2 = \(number * 2)") } 1 x 2 = 2 2 x 2 = 4 3 x 2 = 6 4 x 2 = 8 5 x 2 = 10
30. FOR-IN: RANGES for number in 1..<5 { println("\(number) x 2 = \(number * 2)") } 1 x 2 = 2 2 x 2 = 4 3 x 2 = 6 4 x 2 = 8
31. OPTIONALS let stocks = ["AAPL": 100.11, "GOOG": 573.36, "FB": 79.00] let possiblePrice: Double? = stocks["ORCL"] if possiblePrice == nil { println("Possible Price for Oracle wasn't found") } else { let price = possiblePrice! println("Oracle's Price is \(price)") } // there's a better way if let price = possiblePrice { print("Oracle's Price is \(price)") } // i like an even better way let possiblePrice = price ?? String()
32. IF STATEMENTS if numberOfLegs == 0 { println("It slides") } else if numberOfLegs = 1 { println("It hops") } else { println("It walks") }
33. SWITCH switch numberOfLegs { case 0: print("It slides") case 1: print("It hops") default: print("It walks") }
34. FUNCTIONS // Basic Function func sayHello() { print("Hello World!") } // With Parameter func sayHello(name: String) { print("Hello \(name)!") }
35. FUNCTIONS // With Default Value func sayHello(name: String = "World") { println("Hello \(name)!") } // With Return Value func greeting(name: String = "World") -> String { return "Hello \(name)!" }
36. FUNCTIONS ARE FIRST CLASS CITIZENS
37. CLOSURES let helloPrinter = { print("Hello World!") } // Long Version let helloPrinter: () -> () = { println("Hello World!") }
38. CLOSURES AND PARAMETERS func repeat(count: Int, task: () -> ()) { for i in 0...count { task() } } repeat(2, task: { println("Hello World!") }) Hello World! Hello World!
39. TRAILING CLOSURES func repeat(count: Int, task:() -> ()) { for i in 0..count { task() } } repeat(2) { println("Hello World!") } Hello World! Hello World!
40. CLASSES class Shape { // properties // methods // initializers }
41. CLASS INHERITANCE class Shape { } class Square: Shape { }
42. CLASS PROPERTIES class Shape { // Stored Property var numberOfSides = 0 // Computed Property var description: String { return "number of sides \(numberOfSides)" } }
43. INITIALIZER SYNTAX class Shape { var numberOfSides = 0 var description: String { return "number of sides \(numberOfSides)" } } let myShape = Shape() // Dot Syntax myShape.numberOfSides = 4 print(myShape) // number of sides 4
44. CLASS INITIALIZATION class Square: Shape { init() { super.init() numberOfSides = 4 } } let mySquare = Square() print(mySquare.description)
45. OVERRIDING A PROPERTY class Square: Shape { init() { super.init() numberOfSides = 4 } override var description: String { return "a square has \(numberOfSides) sides" } } let mySquare = Triangle() println(mySquare.description)
46. METHODS class Square: Shape { var sideLength = 0.0 init() { super.init() numberOfSides = 4 } override var description: String { return "a square has \(numberOfSides) sides" } func area() -> Double { return sideLength * sideLength } }
47. STRUCTURES struct Rect { var origin: Point var size: Size var area: Double { return size.width * size.height } }
48. CLASS VS STRUCT WHAT'S THE DIFFERENCE?
49. CLASSES ARE PASSED BY REFERENCE
50. STRUCTURES ARE PASSED VALUE
51. ENUMERATIONS enum SecurityType { case Stock, MutualFund, ETF, Bond } var asset = SecurityType.Stock // asset is inferred to be SecurityType asset = .MutualFund
52. ENUMERATION EXAMPLE enum SecurityType: String { case Stock = "stock" case MutualFund = "mutual_fund" case ETF = "etf" case Bond = "bond" }
53. ENUMERATION EXAMPLE let securityTypeString = json["security_type"].stringValue let securityType = securityTypeForString(securityTypeString) func securityTypeForString(string: String) -> SecurityType { var securityType: SecurityType switch string { case "mutual_fund": securityType = .MutualFund case "etf": securityType = .ETF case "bond" securityType = .Bond case "stock": fallthrough default: securityType = .Stock } return securityType }
54. ENUMERATION EXAMPLE THE SWIFT WAY let securityTypeString = json["security_type"].stringValue let securityType = SecurityType(rawValue: securityTypeString) ?? .Stock
55. ENUMERATIONS ARE ADVANCED Properties Associated Values Initializers Read More in Swift Book
56. EXTENSIONS extension Int { func times(task: () -> ()) { for i in 1..self { task() } } } 100.times { print("Hello World!") }
57. ADVANCED TOPICS
58. GENERICS PROTOCOLS
59. PLAYGROUNDS
61. PART 2
62. FOUNDATION + UIKIT
63. SWIFT USES OBJECTIVE-C LIBRARIES
64. MODEL-VIEW-CONTROLLER (MVC)
65. HUMAN INTERFACE GUIDELINES http://bit.ly/humaninterfaceguidelines
67. DESIGN FOR TOUCH
68. MAXIMIZE INCLUDED DESIGN ELEMENTS
69. DEMO
70. SAMPLE APP
71. UITableView & UITableViewCell
73. Default UITableViewCell
74. A TABLE VIEW HAS DATA SOURCE & DELEGATE
75. INSTRUCTIONS FOR BUILDING THE TABLE VIEW
76. HOW MANY SECTIONS?
77. HOW MANY ROWS PER SECTION?
78. WHAT CELL AND CELL HEIGHT?
79. DOES IT HAVE A TITLE OR FOOTER?
80. DEMO
81. APP DELEGATE AppDelegate.swift
82. import UIKit @UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate { var window: UIWindow? var navigationController: UINavigationController! var mainController: MainViewController! func application( application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { window = UIWindow() mainController = MainViewController() navigationController = UINavigationController(rootViewController: mainController) window!.rootViewController = navigationController window!.makeKeyAndVisible() return true } }
83. APP'S LIFECYCLE import UIKit @UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate { func applicationWillResignActive(application: UIApplication) { } func applicationDidEnterBackground(application: UIApplication) { } func applicationWillEnterForeground(application: UIApplication) { } func applicationDidBecomeActive(application: UIApplication) { } func applicationWillTerminate(application: UIApplication) { } }
84. LOCATION EXAMPLE github.com/riveralabs/LocationExample
85. NO STORYBOARDS
86. PRODUCTION PATTERNS
87. TREEHOUSE teamtreehouse.com
88. RAY WENDERLICH
89. CocoaPods SwiftyJSON
90. TWO CONTROLLERS
91. LIST PLACES
92. ADD / EDIT PLACES
93. DEMO
94. THE END Twitter @arivera Github github.com/riveralabs/