【转载】来自苹果的编程语言——Swift简介
Swift is a new programming language for iOS and OS X apps that builds on the best of C and Objective-C, without the constraints of C compatibility.
Swift adopts safe programming patterns and adds modern features to make programming easier, more flexible and more fun.
Swift’s clean slate, backed by the mature and much-loved Cocoa and Cocoa Touch frameworks, is an opportunity to imagine how software development works.
Swift is the first industrial-quality systems programming language that is as expressive and enjoyable as a scripting language.
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1 println("Hello, world")
变量与常量
1 var myVariable = 42 2 myVariable = 50 3 let myConstant = 42
1 let explicitDouble : Double = 70
1 let label = "The width is " 2 let width = 94 3 let width = label + String(width)
1 let apples = 3 2 let oranges = 5 3 let appleSummary = "I have \(apples) apples." 4 let appleSummary = "I have \(apples + oranges) pieces of fruit."
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1 var shoppingList = ["catfish", "water", "tulips", "blue paint"] 2 shoppingList[1] = "bottle of water" 3 4 var occupations = [ 5 "Malcolm": "Captain", 6 "Kaylee": "Mechanic", 7 ] 8 occupations["Jayne"] = "Public Relations"
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1 let emptyArray = String[]() 2 let emptyDictionary = Dictionary<String, Float>()
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1 let individualScores = [75, 43, 103, 87, 12] 2 var teamScore = 0 3 for score in individualScores { 4 if score > 50 { 5 teamScore += 3 6 } else { 7 teamScore += 1 8 } 9 }
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1 var optionalString: String? = "Hello" 2 optionalString == nil 3 4 var optionalName: String? = "John Appleseed" 5 var gretting = "Hello!" 6 if let name = optionalName { 7 gretting = "Hello, \(name)" 8 }
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1 let vegetable = "red pepper" 2 switch vegetable { 3 case "celery": 4 let vegetableComment = "Add some raisins and make ants on a log." 5 case "cucumber", "watercress": 6 let vegetableComment = "That would make a good tea sandwich." 7 case let x where x.hasSuffix("pepper"): 8 let vegetableComment = "Is it a spicy \(x)?" 9 default: 10 let vegetableComment = "Everything tastes good in soup." 11 }
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1 let interestingNumbers = [ 2 "Prime": [2, 3, 5, 7, 11, 13], 3 "Fibonacci": [1, 1, 2, 3, 5, 8], 4 "Square": [1, 4, 9, 16, 25], 5 ] 6 var largest = 0 7 for (kind, numbers) in interestingNumbers { 8 for number in numbers { 9 if number > largest { 10 largest = number 11 } 12 } 13 } 14 largest
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1 var n = 2 2 while n < 100 { 3 n = n * 2 4 } 5 n 6 7 var m = 2 8 do { 9 m = m * 2 10 } while m < 100 11 m
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1 var firstForLoop = 0 2 for i in 0..3 { 3 firstForLoop += i 4 } 5 firstForLoop 6 7 var secondForLoop = 0 8 for var i = 0; i < 3; ++i { 9 secondForLoop += 1 10 } 11 secondForLoop
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1 func greet(name: String, day: String) -> String { 2 return "Hello \(name), today is \(day)." 3 } 4 greet("Bob", "Tuesday")
1 func getGasPrices() -> (Double, Double, Double) { 2 return (3.59, 3.69, 3.79) 3 } 4 getGasPrices()
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1 func sumOf(numbers: Int...) -> Int { 2 var sum = 0 3 for number in numbers { 4 sum += number 5 } 6 return sum 7 } 8 sumOf() 9 sumOf(42, 597, 12)
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1 func returnFifteen() -> Int { 2 var y = 10 3 func add() { 4 y += 5 5 } 6 add() 7 return y 8 } 9 returnFifteen()
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1 func makeIncrementer() -> (Int -> Int) { 2 func addOne(number: Int) -> Int { 3 return 1 + number 4 } 5 return addOne 6 } 7 var increment = makeIncrementer() 8 increment(7)
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1 func hasAnyMatches(list: Int[], condition: Int -> Bool) -> Bool { 2 for item in list { 3 if condition(item) { 4 return true 5 } 6 } 7 return false 8 } 9 func lessThanTen(number: Int) -> Bool { 10 return number < 10 11 } 12 var numbers = [20, 19, 7, 12] 13 hasAnyMatches(numbers, lessThanTen)
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1 numbers.map({ 2 (number: Int) -> Int in 3 let result = 3 * number 4 return result 5 })
1 numbers.map({ number in 3 * number })
1 sort([1, 5, 3, 12, 2]) { $0 > $1 }
1 class Shape { 2 var numberOfSides = 0 3 func simpleDescription() -> String { 4 return "A shape with \(numberOfSides) sides." 5 } 6 }
1 var shape = Shape() 2 shape.numberOfSides = 7 3 var shapeDescription = shape.simpleDescription()
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1 class NamedShape { 2 var numberOfSides: Int = 0 3 var name: String 4 5 init(name: String) { 6 self.name = name 7 } 8 9 func simpleDescription() -> String { 10 return "A shape with \(numberOfSides) sides." 11 } 12 }
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1 class Square: NamedShape { 2 var sideLength: Double 3 4 init(sideLength: Double, name: String) { 5 self.sideLength = sideLength 6 super.init(name: name) 7 numberOfSides = 4 8 } 9 10 func area() -> Double { 11 return sideLength * sideLength 12 } 13 14 override func simpleDescription() -> String { 15 return "A square with sides of length \(sideLength)." 16 } 17 } 18 let test = Square(sideLength: 5.2, name: "my test square") 19 test.area() 20 test.simpleDescription()
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1 class EquilateralTriangle: NamedShape { 2 var sideLength: Double = 0.0 3 4 init(sideLength: Double, name: String) { 5 self.sideLength = sideLength 6 super.init(name: name) 7 numberOfSides = 3 8 } 9 10 var perimeter: Double { 11 get { 12 return 3.0 * sideLength 13 } 14 set { 15 sideLength = newValue / 3.0 16 } 17 } 18 19 override func simpleDescription() -> String { 20 return "An equilateral triagle with sides of length \(sideLength)." 21 } 22 } 23 var triangle = EquilateralTriangle(sideLength: 3.1, name: "a triangle") 24 triangle.perimeter 25 triangle.perimeter = 9.9 26 triangle.sideLength
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1 class TriangleAndSquare { 2 var triangle: EquilateralTriangle { 3 willSet { 4 square.sideLength = newValue.sideLength 5 } 6 } 7 var square: Square { 8 willSet { 9 triangle.sideLength = newValue.sideLength 10 } 11 } 12 init(size: Double, name: String) { 13 square = Square(sideLength: size, name: name) 14 triangle = EquilateralTriangle(sideLength: size, name: name) 15 } 16 } 17 var triangleAndSquare = TriangleAndSquare(size: 10, name: "another test shape") 18 triangleAndSquare.square.sideLength 19 triangleAndSquare.square = Square(sideLength: 50, name: "larger square") 20 triangleAndSquare.triangle.sideLength
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1 class Counter { 2 var count: Int = 0 3 func incrementBy(amount: Int, numberOfTimes times: Int) { 4 count += amount * times 5 } 6 } 7 var counter = Counter() 8 counter.incrementBy(2, numberOfTimes: 7)
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1 1 2 2 3 3 4 let optionalSquare: Square? = Square(sideLength: 2.5, name: "optional 5 square") 6 let sideLength = optionalSquare?.sideLength
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1 enum Rank: Int { 2 case Ace = 1 3 case Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten 4 case Jack, Queen, King 5 func simpleDescription() -> String { 6 switch self { 7 case .Ace: 8 return "ace" 9 case .Jack: 10 return "jack" 11 case .Queen: 12 return "queen" 13 case .King: 14 return "king" 15 default: 16 return String(self.toRaw()) 17 } 18 } 19 } 20 let ace = Rank.Ace 21 let aceRawValue = ace.toRaw()
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1 if let convertedRank = Rank.fromRaw(3) { 2 let threeDescription = convertedRank.simpleDescription() 3 }
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1 enum Suit { 2 case Spades, Hearts, Diamonds, Clubs 3 func simpleDescription() -> String { 4 switch self { 5 case .Spades: 6 return "spades" 7 case .Hearts: 8 return "hearts" 9 case .Diamonds: 10 return "diamonds" 11 case .Clubs: 12 return "clubs" 13 } 14 } 15 } 16 let hearts = Suit.Hearts 17 let heartsDescription = hearts.simpleDescription()
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1 enum ServerResponse { 2 case Result(String, String) 3 case Error(String) 4 } 5 6 let success = ServerResponse.Result("6:00 am", "8:09 pm") 7 let failure = ServerResponse.Error("Out of cheese.") 8 9 switch success { 10 case let .Result(sunrise, sunset): 11 let serverResponse = "Sunrise is at \(sunrise) and sunset is at \(sunset)." 12 case let .Error(error): 13 let serverResponse = "Failure... \(error)" 14 }
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1 struct Card { 2 var rank: Rank 3 var suit: Suit 4 func simpleDescription() -> String { 5 return "The \(rank.simpleDescription()) of \(suit.simpleDescription())" 6 } 7 } 8 let threeOfSpades = Card(rank: .Three, suit: .Spades) 9 let threeOfSpadesDescription = threeOfSpades.simpleDescription()
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1 protocol ExampleProtocol { 2 var simpleDescription: String { get } 3 mutating func adjust() 4 }
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1 class SimpleClass: ExampleProtocol { 2 var simpleDescription: String = "A very simple class." 3 var anotherProperty: Int = 69105 4 func adjust() { 5 simpleDescription += " Now 100% adjusted." 6 } 7 } 8 var a = SimpleClass() 9 a.adjust() 10 let aDescription = a.simpleDescription 11 12 struct SimpleStructure: ExampleProtocol { 13 var simpleDescription: String = "A simple structure" 14 mutating func adjust() { 15 simpleDescription += " (adjusted)" 16 } 17 } 18 var b = SimpleStructure() 19 b.adjust() 20 let bDescription = b.simpleDescription
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1 extension Int: ExampleProtocol { 2 var simpleDescription: String { 3 return "The number \(self)" 4 } 5 mutating func adjust() { 6 self += 42 7 } 8 } 9 7.simpleDescription
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1 func repeat<ItemType>(item: ItemType, times: Int) -> ItemType[] { 2 var result = ItemType[]() 3 for i in 0..times { 4 result += item 5 } 6 return result 7 } 8 repeat("knock", 4)
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1 // Reimplement the Swift standard library's optional type 2 enum OptionalValue<T> { 3 case None 4 case Some(T) 5 } 6 var possibleInteger: OptionalValue<Int> = .None 7 possibleInteger = .Some(100)
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1 func anyCommonElements <T, U where T: Sequence, U: Sequence, T.GeneratorType.Element: Equatable, T.GeneratorType.Element == U.GeneratorType.Element> (lhs: T, rhs: U) -> Bool { 2 for lhsItem in lhs { 3 for rhsItem in rhs { 4 if lhsItem == rhsItem { 5 return true 6 } 7 } 8 } 9 return false 10 } 11 anyCommonElements([1, 2, 3], [3])
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转载于:https://www.cnblogs.com/sfhios/p/3766120.html
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