From c2d8442fd45fb2013dd44fdbdb8e44193ff14e5d Mon Sep 17 00:00:00 2001 From: numbbbbb Date: Fri, 6 Jun 2014 18:32:09 +0800 Subject: [PATCH] update 02/22 --- chapter1/01_swift.html | 11 +- chapter1/02_a_swift_tour.html | 21 +- chapter1/chapter1.html | 11 +- chapter2/01_The_Basics.html | 11 +- chapter2/02_Basic_Operators.html | 9 +- chapter2/03_Strings_and_Characters.html | 11 +- chapter2/04_Collection_Types.html | 9 +- chapter2/05_Control_Flow.html | 9 +- chapter2/06_Functions.html | 11 +- chapter2/07_Closures.html | 11 +- chapter2/08_Enumerations.html | 9 +- chapter2/09_Classes_and_Structures.html | 11 +- chapter2/10_Properties.html | 9 +- chapter2/11_Methods.html | 9 +- chapter2/12_Subscripts.html | 9 +- chapter2/13_Inheritance.html | 9 +- chapter2/14_Initialization.html | 9 +- chapter2/15_Deinitialization.html | 9 +- chapter2/16_Automatic_Reference_Counting.html | 11 +- chapter2/17_Optional_Chaining.html | 9 +- chapter2/18_Type_Casting.html | 9 +- chapter2/19_Nested_Types.html | 11 +- chapter2/20_Extensions.html | 9 +- chapter2/21_Protocols.html | 9 +- chapter2/22_Generics.html | 360 +++++++++++++++++- chapter2/23_Advanced_Operators.html | 9 +- chapter2/chapter2.html | 11 +- chapter3/01_About_the_Language_Reference.html | 11 +- chapter3/02_Lexical_Structure.html | 9 +- chapter3/03_Types.html | 9 +- chapter3/04_Expressions.html | 9 +- chapter3/05_Declarations.html | 9 +- chapter3/06_Attributes.html | 9 +- chapter3/07_Patterns.html | 9 +- .../08_Generic_Parameters_and_Arguments.html | 9 +- chapter3/09_Summary_of_the_Grammar.html | 9 +- chapter3/chapter3.html | 9 +- gitbook/jsrepl/sandbox.html | 3 +- index.html | 28 +- manifest.appcache | 4 +- search_index.json | 2 +- 41 files changed, 547 insertions(+), 208 deletions(-) diff --git a/chapter1/01_swift.html b/chapter1/01_swift.html index 6f84c85f..bc3ed143 100644 --- a/chapter1/01_swift.html +++ b/chapter1/01_swift.html @@ -46,7 +46,7 @@ -
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    关于 Swift

    Swift 是一种新的编程语言，用于编写 iOS 和 OS X 应用程序。Swift 结合了 C 和 Objective-C 的优点并且不受C的兼容性的限制。Swift 使用安全的编程模式并添加了很多新特性，这将使编程更简单，扩展性更强，也更有趣。除此之外，Swift 还支持人见人爱的 Cocoa 和 Cocoa Touch 框架。拥有了这些特性，Swift将重新定义软件开发。

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    Swift 初见

    +

    本页内容包括：

    +
      +
    • 简单值
      • +
    • 控制流
      • +
    • 函数和闭包
      • +
    • 对象和类
      • +
    • 枚举和结构体
      • +
    • 接口和扩展
      • +
    • 泛型
      • +

    通常来说，编程语言教程中的第一个程序应该在屏幕上打印“Hello, world”。在 Swift 中，可以用一行代码实现：

    println("hello, world")

    如果你写过 C 或者 Objective-C 代码，那你应该很熟悉这种形式——在 Swift 中，这行代码就是一个完整的程序。你不需要为了输入输出或者字符串处理导入一个单独的库。全局作用域中的代码会被自动当做程序的入口点，所以你也不需要main函数。你同样不需要在每个语句结尾写上分号。

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    欢迎使用 Swift

    在本章中您将了解 Swift 的特性和开发历史，并对 Swift 有一个初步的了解。

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    基础部分

    Swift 是 iOS 和 OS X 应用开发的一门新语言。然而，如果你有 C 或者 Objective-C 开发经验的话，你会发现 Swift 的很多内容都是你熟悉的。

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    字符串和字符 (Strings and Characters)

    String 是一个有序的字符集合，例如 "hello, world", "albatross"。 @@ -847,8 +846,8 @@ print("\n") - - + + diff --git a/chapter2/04_Collection_Types.html b/chapter2/04_Collection_Types.html index b624e02c..a2e8596d 100644 --- a/chapter2/04_Collection_Types.html +++ b/chapter2/04_Collection_Types.html @@ -46,7 +46,7 @@ -

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    函数（Functions）

    函数是用来完成特定任务的独立的代码块。你给一个函数起一个合适的名字，用来标示函数做什么，并且当函数需要执行的时候，这个名字会被“调用”。

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    闭包

    闭包是功能性自包含模块，可以在代码中被传递和使用。 @@ -828,8 +827,8 @@ alsoIncrementByTen() - - + + diff --git a/chapter2/08_Enumerations.html b/chapter2/08_Enumerations.html index 851e789e..4e090e9e 100644 --- a/chapter2/08_Enumerations.html +++ b/chapter2/08_Enumerations.html @@ -46,7 +46,7 @@ -

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    类和结构体

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    自动引用计数

    Swift使用自动引用计数(ARC)这一机制来跟踪和管理你的应用程序的内存。通常情况下，Swift的内存管理机制会一直起着作用，你无须自己来考虑内存的管理。ARC会在类的实例不再被使用时，自动释放其占用的内存。

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    类型嵌套

    枚举类型常被用于实现特定类或结构体的功能。也能够在有多种变量类型的环境中，方便地定义通用类或结构体来使用，为了实现这种功能，Swift允许你定义类型嵌套，可以在枚举类型、类和结构体中定义支持嵌套的类型。

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    泛型

    +
    +

    泛型代码可以确保你写出灵活的，可重用的函数和定义出任何你所确定好的需求的类型。你的可以写出避免重复的代码，并且用一种清晰的，抽象的方式表达出来。

    +

    泛型是Swift需要强大特征中的其中一个，许多Swift标准库是通过泛型代码构建出来的。事实上，你已经使用泛型贯穿着整个Language Guide，即便你没有实现它。例如：Swift的Array和Dictionary类型都是泛型集。你可以创建一个Int数组，也可创建一个String数组，或者甚至于可以是任何其他Swift的类型数据数组。同样的，你也可以创建存储任何指定类型的字典(dictionary)，而且这些类型可以是没有限制的。

    +
    +

    泛型所解决的问题

    +

    这里是一个标准的，非泛型函数swapTwoInts,用来交换两个Int值：

    +
        func swapTwoInts(inout a: Int, inout b: Int) 
+        let temporaryA = a
+        a = b
+        b = temporaryA
+    }
+
    +

    这个函数使用in-out参数交换a和b的值，这两个参数被描述为[In-Out类型参数][1]。

    +

    swapTwoInts函数可以交换b的原始值到a，也可以交换a的原始值到b，你可以调用这个函数交换两个Int变量值：

    +
        var someInt = 3
+    var anotherInt = 107
+    swapTwoInts(&someInt, &anotherInt)
+    println("someInt is now \(someInt), and anotherInt is now \(anotherInt)")
+    // prints "someInt is now 107, and anotherInt is now 3"
+
    +

    swapTwoInts函数是非常有用的，但是它只能交换Int值，如果你想要交换两个String或者Double，就不得不写更多的函数，如 swapTwoStrings和swapTwoDoublesfunctions，如同如下所示：

    +
        func swapTwoStrings(inout a: String, inout b: String) {
+        let temporaryA = a
+        a = b
+        b = temporaryA
+    }
+
+    func swapTwoDoubles(inout a: Double, inout b: Double) {
+        let temporaryA = a
+        a = b
+        b = temporaryA
+    }
+
    +

    你可能注意到 swapTwoInts、 swapTwoStrings和swapTwoDoubles函数主题都是相同的，唯一不同之处就在于传入的变量不同，分别是Int、String和Double。

    +

    但实际应用中通常需要一个用处更强大并且尽可能的考虑到更多的灵活性单个函数，可以用来交换两个任何类型值，很幸运的是，泛型代码帮你解决了这种问题。（一个这种泛型函数后面已经定义好了。）

    +
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    NOTE

    +

    In all three functions, it is important that the types of a and b are defined to be the same as each other. If a and b were not of the same type, it would not be possible to swap their values. Swift is a type-safe language, and does not allow (for example) a variable of type String and a variable of type Double to swap values with each other. Attempting to do so would be reported as a compile-time error.

    +
    +

    泛型函数

    +

    泛型函数可以工作于任何类型，这里是一个上面swapTwoInts函数的泛型版本，用于交换两个值：

    +
        func swapTwoValues<T>(inout a: T, inout b: T) {
+        let temporaryA = a
+        a = b
+        b = temporaryA
+    }
+
    +

    swapTwoValues函数主体和swapTwoInts函数是一样，而且，只在第一行稍微有那么一点点不同于swapTwoInts，如下所示：

    +
        func swapTwoInts(inout a: Int, inout b: Int)
+    func swapTwoValues<T>(inout a: T, inout b: T)
+
    +

    这个函数的泛型版本使用了节点类型命名（通常此情况下用字母T来表示）来代替实际类型名（如Int、String或Double）。节点类型名并不是表示T必须是任何类型，但是其规定a和b必须是同一类型的T，而不管T表示任何类型。只有swapTwoValues函数在每次调用时所传入的实际类型决定了T所代表的类型。

    +

    另外一个不同之处在于这个泛型函数名后面跟着的节点类型名(T)是用尖括号括起来的()。这个尖括号告诉Swift那个T是swapTwoValues函数所定义的一个节点类型。因为T是一个节点，Swift不会去查找每一个命名为T的实际类型。

    +

    swapTwoValues函数除了只要传入的两个任何类型值是同一类型外，也可以作为swapTwoInts函数被调用。每次swapTwoValues被调用，T所代表的类型值都会传给函数。

    +

    在下面的两个例子中,T分别代表Tnt和String：

    +
        var someInt = 3
+    var anotherInt = 107
+    swapTwoValues(&someInt, &anotherInt)
+    // someInt is now 107, and anotherInt is now 3
+
+    var someString = "hello"
+    var anotherString = "world"
+    swapTwoValues(&someString, &anotherString)
+    // someString is now "world", and anotherString is now "hello"
+
    +
    +

    NOTE

    +

    The swapTwoValues function defined above is inspired by a generic function called swap, which is part of the Swift standard library, and is automatically made available for you to use in your apps. If you need the behavior of the swapTwoValues function in your own code, you can use Swift’s existing swap function rather than providing your own implementation.

    +
    +

    Type Parameters

    +

    类型参数

    +

    在上面的swapTwoValues例子中，节点类型T是一种类型参数的示例。类型参数指定并命名为一个节点类型，并且紧随在函数名后面，并用一对尖括号括起来（如）。

    +

    一旦一个类型参数被指定，那么其可以被使用来定义一个函数的参数类型（如swapTwoValues函数中的参数a和b），或作为一个函数返回类型，或用作函数主体中的注释类型。在这种情况下，被类型参数所代表的节点类型不管函数任何时候被调用，都会被实际类型所替换（在上面swapTwoValues例子中，当函数第一次被调用时，T被Int替换，第二次调用时，被String替换。）。

    +

    你可支持多个类型参数，命名在尖括号中，用逗号分开。

    +

    命名类型参数

    +

    在简单的情况下，泛型函数或泛型类型需要指定一个节点类型（如上面的swapTwoValues泛型函数，或一个存储单一类型的泛型集，如Array），通常用一单个字母T来命名类型参数。不过，你可以使用任何有效的标识符来作为类型参数名。

    +

    如果你使用多个参数定义更复杂的泛型函数或泛型类型，那么使用更多的描述类型参数是非常有用的。例如，Swift字典(Dictionary)类型有两个类型参数，一个是key，另外一个是值。如果你自己写字典，你或许会定义这两个类型参数为KeyType和ValueType，用来记住它们在你的泛型代码中的作用。

    +
    +

    NOTE

    +

    Always give type parameters UpperCamelCase names (such as T and KeyType) to indicate that they are a placeholder for a type, not a value.

    +
    +

    泛型类型

    +

    通常在泛型函数中，Swift允许你定义你自己的泛型类型。这些自定义类、结构体和枚举作用于任何类型，如同Array和Dictionary的用法。

    +

    这部分向你展示如何写一个泛型集类型-Stack(栈)。一个栈是一系列值域的集合，和array(数组)相似，但其是一个比Swift的Array类型更多限制的集合。一个数组可以允许其里面任何位置的插入/删除操作，而栈，只允许，只允许在集合的末端添加新的项（如同push一个新值进栈）。同样的一个栈也只能从末端移除项（如同pop一个值出栈）。

    +
    +

    NOTE

    +

    The concept of a stack is used by the UINavigationController class to model the view controllers in its navigation hierarchy. You call the UINavigationController class pushViewController:animated: method to add (or push) a view controller on to the navigation stack, and its popViewControllerAnimated: method to remove (or pop) a view controller from the navigation stack. A stack is a useful collection model whenever you need a strict “last in, first out” approach to managing a collection.

    +
    +

    下图展示了一个栈的压栈(push)/出栈(pop)的行为：

    +

    ![此处输入图片的描述][2]

    +
      +
    1. 现在有三个值在栈中；
      2. +
    2. 第四个值“pushed”到栈的顶部；
      3. +
    3. 现在有四个值在栈中，最近的那个在顶部；
      4. +
    4. 栈中最顶部的那个项被移除，或称之为“popped”；
      5. +
    5. 移除掉一个值后，现在栈又重新只有三个值。
      6. +
    +

    这里展示了如何写一个非泛型版本的栈，Int值型的栈：

    +
    struct IntStack {
+    var items = Int[]()
+    mutating func push(item: Int) {
+        items.append(item)
+    }
+    mutating func pop() -> Int {
+        return items.removeLast()
+    }
+}
+
    +

    这个结构体在栈中使用一个Array性质的items存储值。Stack提供两个方法：push和pop，从栈中压进一个值和移除一个值。这些方法标记为可变的，因为他们需要修改（或转换）结构体的items数组。

    +

    上面所展现的IntStack类型只能用于Int值，不过，其对于定义一个泛型Stack类（可以处理任何类型值的栈）是非常有用的。

    +

    这里是一个相同代码的泛型版本：

    +
    struct Stack<T> {
+    var items = T[]()
+    mutating func push(item: T) {
+        items.append(item)
+    }
+    mutating func pop() -> T {
+        return items.removeLast()
+    }
+}
+
    +

    注意到Stack的泛型版本基本上和非泛型版本相同，但是泛型版本的节点类型参数为T代替了实际Int类型。这种类型参数包含在一对尖括号里(<T>)，紧随在结构体名字后面。

    +

    T定义了一个名为“某种类型T”的节点提供给后来用。这种将来类型可以在结构体的定义里任何地方表示为“T”。在这种情况下，T在如下三个地方被用作节点：

    +
      +
    • 创建一个名为items的属性，使用空的T类型值数组对其进行初始化；
      • +
    • 指定一个包含一个参数名为item的push方法，该参数必须是T类型；
      • +
    • 指定一个pop方法的返回值，该返回值将是一个T类型值。
      • +
    +

    当创建一个新单例并初始化时， 通过用一对紧随在类型名后的尖括号里写出实际指定栈用到类型，创建一个Stack实例，同创建Array和Dictionary一样：

    +
    var stackOfStrings = Stack<String>()
+stackOfStrings.push("uno")
+stackOfStrings.push("dos")
+stackOfStrings.push("tres")
+stackOfStrings.push("cuatro")
+// 现在栈已经有4个string了
+
    +

    下图将展示stackOfStrings如何push这四个值进栈的过程：

    +

    ![此处输入图片的描述][3]

    +

    从栈中pop并移除值"cuatro"：

    +
    let fromTheTop = stackOfStrings.pop()
+// fromTheTop is equal to "cuatro", and the stack now contains 3 strings
+
    +

    下图展示了如何从栈中pop一个值的过程： +![此处输入图片的描述][4]

    +

    由于Stack是泛型类型，所以在Swift中其可以用来创建任何有效类型的栈，这种方式如同Array和Dictionary。

    +

    类型约束

    +

    swapTwoValues函数和Stack类型可以作用于任何类型，不过，有的时候对使用在泛型函数和泛型类型上的类型强制约束为某种特定类型是非常有用的。类型约束指定了一个必须继承自指定类的类型参数，或者遵循一个特定的协议或协议构成。

    +

    例如，Swift的Dictionary类型对作用于其keys的类型做了些限制。在[Dictionaries][5]的描述中，字典的keys类型必须是hashable，也就是说，必须有一种方法可以使其是唯一的表示。Dictionary之所以需要其keys是hashable是为了以便于其检查其是否包含某个特定key的值。如无此需求，Dictionary即不会告诉是否插入或者替换了某个特定key的值，也不能查找到已经存储在字典里面的给定key值。

    +

    这个需求强制加上一个类型约束作用于Dictionary的key上，当然其key类型必须遵循Hashable协议（Swift标准库中定义的一个特定协议）。所有的Swift基本类型（如String，Int， Double和 Bool）默认都是hashable。

    +

    当你创建自定义泛型类型时，你可以定义你自己的类型约束，当然，这些约束要支持泛型编程的强力特征中的多数。抽象概念如Hashtable具有的类型特征是根据他们概念特征来界定的，而不是他们的直接类型特征。

    +

    类型约束语法

    +

    你可以写一个在一个类型参数名后面的类型约束，通过冒号分割，来作为类型参数链的一部分。这种作用于泛型函数的类型约束的基础语法如下所示（和泛型类型的语法相同）：

    +
    func someFunction<T: SomeClass, U: SomeProtocol>(someT: T, someU: U) {
+    // function body goes here
+}
+
    +

    上面这个假定函数有两个类型参数。第一个类型参数T，有一个需要T必须是SomeClass子类的类型约束；第二个类型参数U，有一个需要U必须遵循SomeProtocol协议的类型约束。

    +

    类型约束行为

    +

    这里有个名为findStringIndex的非泛型函数，该函数功能是去查找包含一给定String值的数组。若查找到匹配的字符串，findStringIndex函数返回该字符串在数组中的索引值（Int），反之则返回nil：

    +
    func findStringIndex(array: String[], valueToFind: String) -> Int? {
+    for (index, value) in enumerate(array) {
+        if value == valueToFind {
+            return index
+        }
+    }
+    return nil
+}
+
    +

    findStringIndex函数可以作用于查找一字符串数组中的某个字符串:

    +
    let strings = ["cat", "dog", "llama", "parakeet", "terrapin"]
+if let foundIndex = findStringIndex(strings, "llama") {
+    println("The index of llama is \(foundIndex)")
+}
+// prints "The index of llama is 2"
+
    +

    如果只是针对字符串而言查找在数组中的某个值的索引，用处不是很大，不过，你可以写出相同功能的泛型函数findIndex，用某个类型T值替换掉提到的字符串。

    +

    这里展示如何写一个你或许期望的findStringIndex的泛型版本findIndex。请注意这个函数仍然返回Int，是不是有点迷惑呢，而不是泛型类型?那是因为函数返回的是一个可选的索引数，而不是从数组中得到的一个可选值。需要提醒的是，这个函数不会编译，原因在例子后面会说明：

    +
    func findIndex<T>(array: T[], valueToFind: T) -> Int? {
+    for (index, value) in enumerate(array) {
+        if value == valueToFind {
+            return index
+        }
+    }
+    return nil
+}
+
    +

    上面所写的函数不会编译。这个问题的位置在等式的检查上，“if value == valueToFind”。不是所有的Swift中的类型都可以用等式符(==)进行比较。例如，如果你创建一个你自己的类或结构体来表示一个复杂的数据模型，那么Swift没法猜到对于这个类或结构体而言“等于”的意思。正因如此，这部分代码不能可能保证工作于每个可能的类型T，当你试图编译这部分代码时估计会出现相应的错误。

    +

    不过，所有的这些并不会让我们无从下手。Swift标准库中定义了一个Equatable协议，该协议要求任何遵循的类型实现等式符(==)和不等符(!=)对任何两个该类型进行比较。所有的Swift标准类型自动支持Equatable协议。

    +

    任何Equatable类型都可以安全的使用在findIndex函数中，因为其保证支持等式操作。为了说明这个事实，当你定义一个函数时，你可以写一个Equatable类型约束作为类型参数定义的一部分：

    +
    func findIndex<T: Equatable>(array: T[], valueToFind: T) -> Int? {
+    for (index, value) in enumerate(array) {
+        if value == valueToFind {
+            return index
+        }
+    }
+    return nil
+}
+
    +

    findIndex中这个单个类型参数写做：T: Equatable，也就意味着“任何T类型都遵循Equatable协议”。

    +

    findIndex函数现在则可以成功的编译过，并且作用于任何遵循Equatable的类型，如Double或String:

    +
    let doubleIndex = findIndex([3.14159, 0.1, 0.25], 9.3)
+// doubleIndex is an optional Int with no value, because 9.3 is not in the array
+let stringIndex = findIndex(["Mike", "Malcolm", "Andrea"], "Andrea")
+// stringIndex is an optional Int containing a value of 2
+
    +

    关联类型

    +

    当定义一个协议时，有的时候声明一个或多个关联类型作为协议定义的一部分是非常有用的。一个关联类型给定作用于协议部分的类型一个节点名（或别名）。作用于关联类型上实际类型是不需要指定的，直到该协议接受。关联类型被指定为typealias关键字。

    +

    关联类型行为

    +

    这里是一个Container协议的例子，定义了一个ItemType关联类型：

    +
    protocol Container {
+    typealias ItemType
+    mutating func append(item: ItemType)
+    var count: Int { get }
+    subscript(i: Int) -> ItemType { get }
+}
+
    +

    Container协议定义了三个任何容器必须支持的兼容要求：

    +
      +
    • 必须可能通过append方法添加一个新item到容器里；
      • +
    • 必须可能通过使用count属性获取容器里items的数量，并返回一个Int值；
      • +
    • 必须可能通过容器的Int索引值下标可以检索到每一个item。
      • +
    +

    这个协议没有指定容器里item是如何存储的或何种类型是允许的。这个协议只指定三个任何遵循Container类型所必须支持的功能点。一个遵循的类型也可以提供其他额外的功能，只要满足这三个条件。

    +

    任何遵循Container协议的类型必须指定存储在其里面的值类型，必须保证只有正确类型的items可以加进容器里，必须明确可以通过其下标返回item类型。

    +

    为了定义这三个条件，Container协议需要一个方法指定容器里的元素将会保留，而不需要知道特定容器的类型。Container协议需要指定任何通过append方法添加到容器里的值和容器里元素是相同类型，并且通过容器下标返回的容器元素类型的值的类型是相同类型。

    +

    为了达到此目的，Container协议声明了一个ItemType的关联类型，写作typealias ItemType。The protocol does not define what ItemType is an alias for—that information is left for any conforming type to provide（这个协议不会定义ItemType是遵循类型所提供的何种信息的别名）。尽管如此，ItemType别名支持一种方法识别在一个容器里的items类型，以及定义一种使用在append方法和下标中的类型，以便保证任何期望的Container的行为是强制性的。

    +

    这里是一个早前IntStack类型的非泛型版本，适用于遵循Container协议：

    +
    struct IntStack: Container {
+    // original IntStack implementation
+    var items = Int[]()
+    mutating func push(item: Int) {
+        items.append(item)
+    }
+    mutating func pop() -> Int {
+        return items.removeLast()
+    }
+    // conformance to the Container protocol
+    typealias ItemType = Int
+    mutating func append(item: Int) {
+        self.push(item)
+    }
+    var count: Int {
+    return items.count
+    }
+    subscript(i: Int) -> Int {
+        return items[i]
+    }
+}
+
    +

    IntStack类型实现了Container协议的所有三个要求，在IntStack类型的每个包含部分的功能都满足这些要求。

    +

    此外，IntStack指定了Container的实现，适用的ItemType被用作Int类型。对于这个Container协议实现而言，定义 typealias ItemType = Int，将抽象的ItemType类型转换为具体的Int类型。

    +

    感谢Swift类型参考，你不用在IntStack定义部分声明一个具体的Int的ItemType。由于IntStack遵循Container协议的所有要求，只要通过简单的查找append方法的item参数类型和下标返回的类型，Swift就可以推断出合适的ItemType来使用。确实，如果上面的代码中你删除了 typealias ItemType = Int这一行，一切仍旧可以工作，因为它清楚的知道ItemType使用的是何种类型。

    +

    你也可以生成遵循Container协议的泛型Stack类型：

    +
    struct Stack<T>: Container {
+    // original Stack<T> implementation
+    var items = T[]()
+    mutating func push(item: T) {
+        items.append(item)
+    }
+    mutating func pop() -> T {
+        return items.removeLast()
+    }
+    // conformance to the Container protocol
+    mutating func append(item: T) {
+        self.push(item)
+    }
+    var count: Int {
+    return items.count
+    }
+    subscript(i: Int) -> T {
+        return items[i]
+    }
+}
+
    +

    这个时候，节点类型参数T被用作append方法的item参数和下标的返回类型。Swift因此可以推断出被用作这个特定容器的ItemType的T的合适类型。

    +

    扩展一个存在的类型为一指定关联类型

    +

    在[Adding Protocol Conformance with an Extension][6]中有描述扩展一个存在的类型添加遵循一个协议。这个类型包含一个关联类型的协议。

    +

    Swift的Array已经提供append方法，一个count属性和通过下标来查找一个自己的元素。这三个功能都达到Container协议的要求。也就意味着你可以扩展Array去遵循Container协议，只要通过简单声明Array适用于该协议而已。如何实践这样一个空扩展，在[Declaring Protocol Adoption with an Extension][7]中有描述这样一个实现一个空扩展的行为：

    +
    extension Array: Container {}
+
    +

    如同上面的泛型Stack类型一样，Array的append方法和下标保证Swift可以推断出ItemType所使用的适用的类型。定义了这个扩展后，你可以将任何Array当作Container来使用。

    +

    Where 语句

    +

    [Type Constraints][8]中描述的类型约束确保你定义关于类型参数的需求和一泛型函数或类型有关联。

    +

    对于关联类型的定义需求也是非常有用的。你可以通过这样去定义where语句作为一个类型参数队列的一部分。一个where语句使你能够要求一个关联类型遵循一个特定的协议，以及（或）那个特定的类型参数和关联类型可以是相同的。你可写一个where语句，通过紧随放置where关键字在类型参数队列后面，其后跟着一个或者多个针对关联类型的约束，以及（或）一个或多个类型和关联类型的等于关系。

    +

    下面的列子定义了一个名为allItemsMatch的泛型函数，用来检查是否两个Container单例包含具有相同顺序的相同items。如果匹配到所有的items，那么返回一个为true的Boolean值，反之，则相反。

    +

    这两个容器可以被检查出是否是相同类型的容器（虽然它们可以是），但他们确实拥有相同类型的items。这个需求通过一个类型约束和where语句结合来表示：

    +
    func allItemsMatch<
+    C1: Container, C2: Container
+    where C1.ItemType == C2.ItemType, C1.ItemType: Equatable>
+    (someContainer: C1, anotherContainer: C2) -> Bool {
+
+        // check that both containers contain the same number of items
+        if someContainer.count != anotherContainer.count {
+            return false
+        }
+
+        // check each pair of items to see if they are equivalent
+        for i in 0..someContainer.count {
+            if someContainer[i] != anotherContainer[i] {
+                return false
+            }
+        }
+
+        // all items match, so return true
+        return true
+
+}
+
    +

    这个函数用了两个参数：someContainer和anotherContainer。someContainer参数是类型C1，anotherContainer参数是类型C2。C1和C2是容器的两个节点类型参数，决定了这个函数何时被调用。

    +

    这个函数的类型参数列紧随在两个类型参数需求的后面：

    +
      +
    • C1必须遵循Container协议 (写作 C1: Container)。
      • +
    • C2必须遵循Container协议 (写作 C2: Container)。
      • +
    • C1的ItemType同样是C2的ItemType（写作 C1.ItemType == C2.ItemType）。
      • +
    • C1的ItemType必须遵循Equatable协议 (写作 C1.ItemType: Equatable)。
      • +
    +

    第三个和第四个要求被定义为一个where语句的一部分，写在关键字where后面，作为函数类型参数链的一部分。

    +

    这些要求意思是：

    +

    someContainer是一个C1类型的容器。 +anotherContainer是一个C2类型的容器。 +someContainer和anotherContainer包含相同的items类型。 +someContainer中的items可以通过不等于操作(!=)来检查它们是否彼此不同。

    +

    第三个和第四个要求结合起来的意思是anotherContainer中的items也可以通过 != 操作来检查，因为他们在someContainer中items确实是相同的类型。

    +

    这些要求能够使allItemsMatch函数比较两个容器，即便他们是不同的容器类型。

    +

    allItemsMatch首先检查两个容器是否拥有同样数目的items，如果他们的items数目不同，没有办法进行匹配，函数就会false。

    +

    检查完之后，函数通过for-in循环和半闭区间操作(..)来迭代someContainer中的所有items。对于每个item，函数检查是否someContainer中的item不等于对应的anotherContainer中的item，如果这两个items不等，则这两个容器不匹配，返回false。

    +

    如果循环体结束后未发现没有任何的不匹配，那表明两个容器匹配，函数返回true。

    +

    Here’s how the allItemsMatch function looks in action: +这里演示了allItemsMatch函数运算的过程：

    +
    var stackOfStrings = Stack<String>()
+stackOfStrings.push("uno")
+stackOfStrings.push("dos")
+stackOfStrings.push("tres")
+
+var arrayOfStrings = ["uno", "dos", "tres"]
+
+if allItemsMatch(stackOfStrings, arrayOfStrings) {
+    println("All items match.")
+} else {
+    println("Not all items match.")
+}
+// prints "All items match."
+
    +

    上面的例子创建一个Stack单例来存储String，然后压了三个字符串进栈。这个例子也创建了一个Array单例，并初始化包含三个同栈里一样的原始字符串。即便栈和数组否是不同的类型，但他们都遵循Container协议，而且他们都包含同样的类型值。你因此可以调用allItemsMatch函数，用这两个容器作为它的参数。在上面的例子中，allItemsMatch函数正确的显示了所有的这两个容器的items匹配。

    + + +
    +
    @@ -591,8 +941,8 @@ - - + + diff --git a/chapter2/23_Advanced_Operators.html b/chapter2/23_Advanced_Operators.html index c7f3a4af..d0bc137a 100644 --- a/chapter2/23_Advanced_Operators.html +++ b/chapter2/23_Advanced_Operators.html @@ -46,7 +46,7 @@ -
    +
    @@ -481,8 +481,7 @@
  • Generated using GitBook
    • -
    • +
    @@ -591,8 +590,8 @@ - - + + diff --git a/chapter2/chapter2.html b/chapter2/chapter2.html index 2ebf6dcd..b26483f3 100644 --- a/chapter2/chapter2.html +++ b/chapter2/chapter2.html @@ -46,7 +46,7 @@ -
    +
    @@ -481,8 +481,7 @@
  • Generated using GitBook
    • -
    • +
    @@ -576,7 +575,7 @@
    -
    +

    Swift 教程

    本章介绍了 Swift 的各种特性及其使用方法，是全书的核心部分。

    @@ -599,8 +598,8 @@ - - + + diff --git a/chapter3/01_About_the_Language_Reference.html b/chapter3/01_About_the_Language_Reference.html index a2638685..fa39c8d3 100644 --- a/chapter3/01_About_the_Language_Reference.html +++ b/chapter3/01_About_the_Language_Reference.html @@ -46,7 +46,7 @@ -
    +
    @@ -481,8 +481,7 @@
  • Generated using GitBook
    • -
    • +
    @@ -576,7 +575,7 @@
    -
    +

    关于语言附注

    本书的这一节描述了Swift编程语言的形式语法。这里描述的语法是为了帮助您更详细的了解该语言，而不是让您直接实现一个解析器或编译器。

    @@ -624,8 +623,8 @@ - - + + diff --git a/chapter3/02_Lexical_Structure.html b/chapter3/02_Lexical_Structure.html index 86733718..78a0e0f6 100644 --- a/chapter3/02_Lexical_Structure.html +++ b/chapter3/02_Lexical_Structure.html @@ -46,7 +46,7 @@ -
    +
    @@ -481,8 +481,7 @@
  • Generated using GitBook
    • -
    • +
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    Swift 编程语言

    Swift 是苹果在 WWDC 2014 上发布的一款全新的编程语言，本书译自苹果官方的 Swift 教程《The Swift Programming Language》。

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