chuanyituoku的专栏

1. Type Casting Checking Type

Optionals Use optionals to safely working with possibly missing values

Weak 和Objective－C的很像 (auto niled) Weak

1. Initialization For example, where in Objective-C you would do this: SWIFT let myTableView: UITableView = UITableView(frame: CGRectZero, style: .Grouped)”

1. Array for item in shoppingList { println(item) } // Six eggs for (index, value) in enumerate(shoppingList) { println("Item \(index + 1): \(value)") } // Item 1: Six eggs // Item 2: Milk /

1. Extensions Extensions add new functionality to an existing class, structure, or enumeration type. This includes the ability to extend types for which you do not have access to the original sou

1.  @infix struct Vector2D { var x = 0.0, y = 0.0 } @infix func + (left: Vector2D, right: Vector2D) -> Vector2D { return Vector2D(x: left.x + right.x, y: left.y + right.y) } let vector = Vec

1. Curried Functions and Methods Curried functions and methods have the following form: func function name(parameters)(parameters) -> return type { statements } A function declared this

1. func func join(string s1: String, toString s2: String, withJoiner joiner: String) -> String { return s1 + joiner + s2 }

1. Generic Functions func swapTwoValues(inout a: T, inout b: T) { let temporaryA = a a = b b = temporaryA }

1。 Methods 分为instance method 和 type methods

1. Enumeration let somePlanet = Planet.Earth switch somePlanet { case .Earth: println("Mostly harmless") default: println("Not a safe place for humans") } // prints "Mostly harmless”

Protocols “A protocol defines a blueprint of methods, properties, and other requirements that suit a particular task or piece of functionality.” 1. Property Requirements

1. 一条语句结尾没有分号；