diff --git a/chapter1/01_swift.html b/chapter1/01_swift.html index 72c246cb..fd9c4552 100644 --- a/chapter1/01_swift.html +++ b/chapter1/01_swift.html @@ -46,7 +46,7 @@ -
+
@@ -587,7 +587,7 @@
-
+

关于 Swift

Swift 是一种新的编程语言，用于编写 iOS 和 OS X 应用。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。

diff --git a/chapter1/02_a_swift_tour.html b/chapter1/02_a_swift_tour.html index 6d10a945..990f1894 100644 --- a/chapter1/02_a_swift_tour.html +++ b/chapter1/02_a_swift_tour.html @@ -46,7 +46,7 @@ -
+
@@ -587,7 +587,7 @@
-
+

Swift 初见

本页内容包括：

diff --git a/chapter1/chapter1.html b/chapter1/chapter1.html index cf1d6252..1bcb13d1 100644 --- a/chapter1/chapter1.html +++ b/chapter1/chapter1.html @@ -46,7 +46,7 @@ -
+
@@ -587,7 +587,7 @@
-
+

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。

diff --git a/chapter2/01_The_Basics.html b/chapter2/01_The_Basics.html index 7ddb85f2..890545d4 100644 --- a/chapter2/01_The_Basics.html +++ b/chapter2/01_The_Basics.html @@ -46,7 +46,7 @@ -
+
@@ -587,7 +587,7 @@
-
+

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。

@@ -625,34 +625,34 @@ var currentLoginAttempt = 0

常量和变量的命名

你可以用任何你喜欢的字符作为常量和变量名，包括Unicode字符：

-
    let π = 3.14159
-    let 你好 = "你好世界"
-    let 🐶🐮 = "dogcow"
+
let π = 3.14159
+let 你好 = "你好世界"
+let 🐶🐮 = "dogcow"
 
常量与变量名不能包含数学符号，箭头，保留的(或者非法的)Unicode码位，连线与制表符。尽管常量与变量名中可以包含数字，但是它们不能以数字打头。

 
一旦你将常量或者变量声明为确定的类型，你就不能使用相同的名字再次进行声明，或者以改变其存储的值为其他类型。同时，你也不能将常量与变量进行互转。

 

 
注意：如果你需要使用与Swift保留关键字相同的名称作为常量或者变量名，你可以使用反引号(`)将关键字围住的方式将其作为名字使用。无论如何，你应当避免使用关键字作为常量或变量名，除非你别无选择。

 

 
你可以更改现有的变量值为其他同类型的值，在下面的例子中，friendlyWelcome的值从"Hello!"改为了"Bonjour!":

-
    var friendlyWelcome = "Hello!"
-    friendlyWelcome = "Bonjour!"
-    // friendlyWelcome is now "Bonjour!"
+
var friendlyWelcome = "Hello!"
+friendlyWelcome = "Bonjour!"
+// friendlyWelcome is now "Bonjour!"
 
和变量不一样，常量的值一旦被确定以后就不能更改了。尝试这样做会在编译时报错：

-
    let languageName = "Swift"
-    languageName = "Swift++"
-    // this is a compile-time error - languageName cannot be changed
+
let languageName = "Swift"
+languageName = "Swift++"
+// this is a compile-time error - languageName cannot be changed
 
输出常量和变量

 
你可以用println函数来输出当前常量或变量的值:

-
    println(friendlyWelcome)
-    // prints "Bonjour!"
+
println(friendlyWelcome)
+// prints "Bonjour!"
 
println是一个用来输出的全局函数，输出的内容会在最后带换行。如果你用Xcode，println将会输出内容到“console”面板上。(另一种函数叫print，唯一区别是在输出内容最后不会加入换行。)

 
println函数输出传入的String值：

-
    println("This is a string")
-    // prints "This is a string"
+
println("This is a string")
+// prints "This is a string"
 
像Cocoa里的NSLog函数一样，println函数可以输出更复杂的信息。这些信息可以包含当前常量和变量的值。

 
Swift用字符串插值（string interpolation）的方式把常量名或者变量名当做占位符加入到长字符串中，Swift会用当前常量或变量的值替换这些占位符。将常量或变量名放入反斜杠符加一对圆括号中"\()"：

-
    println("The current value of friendlyWelcome is \(friendlyWelcome)")
-    // prints "The current value of friendlyWelcome is Bonjour!
+
println("The current value of friendlyWelcome is \(friendlyWelcome)")
+// prints "The current value of friendlyWelcome is Bonjour!
 

 
注意：字符串插值所有可用的选项在 字符串插值 这章中讲述。

 

diff --git a/chapter2/02_Basic_Operators.html b/chapter2/02_Basic_Operators.html
index 807b5953..91e17a69 100644
--- a/chapter2/02_Basic_Operators.html
+++ b/chapter2/02_Basic_Operators.html
@@ -46,7 +46,7 @@
 
 
         
-    

+    

     

     
     
@@ -587,7 +587,7 @@
 
                 

                 
-                    

+                    

                     
                         
基本运算符

 
运算符是检查, 改变, 合并值的特殊符号或短语. 例如, 加号 + 把计算两个数的和(如 let i = 1 + 2). 复杂些的运行算包括逻辑与&&(如 if enteredDoorCode && passedRetinaScan), 还有自增运算符 ++i 这样让自身加一的便捷运算.

diff --git a/chapter2/03_Strings_and_Characters.html b/chapter2/03_Strings_and_Characters.html
index 78fd2ea7..feb0581c 100644
--- a/chapter2/03_Strings_and_Characters.html
+++ b/chapter2/03_Strings_and_Characters.html
@@ -46,7 +46,7 @@
 
 
         
-    

+    

     

     
     
@@ -587,7 +587,7 @@
 
                 

                 
-                    

+                    

                     
                         
字符串和字符 (Strings and Characters)

 

diff --git a/chapter2/04_Collection_Types.html b/chapter2/04_Collection_Types.html
index 8eb049b0..1e944f7b 100644
--- a/chapter2/04_Collection_Types.html
+++ b/chapter2/04_Collection_Types.html
@@ -46,7 +46,7 @@
 
 
         
-    

+    

     

     
     
@@ -587,7 +587,7 @@
 
                 

                 
-                    

+                    

                     
                         
集合类型 (Collection Types)

 
Swift语言提供经典的数组和字典两种集合类型来存储集合数据。数组用来按顺序存储相同类型的数据。字典虽然无序存储相同类型数据值但是需要由独有的标识符引用和寻址（就是键值对）。

diff --git a/chapter2/05_Control_Flow.html b/chapter2/05_Control_Flow.html
index 06bbb35c..d3251e6a 100644
--- a/chapter2/05_Control_Flow.html
+++ b/chapter2/05_Control_Flow.html
@@ -46,7 +46,7 @@
 
 
         
-    

+    

     

     
     
@@ -587,7 +587,7 @@
 
                 

                 
-                    

+                    

                     
                         
控制流

 
Swift提供了类似C语言的流程控制结构，包括可以多次执行任务的for和while循环，基于特定条件选择执行不同代码分支的if和switch语句，还有控制流程跳转到其他代码的break和continue语句。

diff --git a/chapter2/06_Functions.html b/chapter2/06_Functions.html
index d8aaa436..119a9729 100644
--- a/chapter2/06_Functions.html
+++ b/chapter2/06_Functions.html
@@ -46,7 +46,7 @@
 
 
         
-    

+    

     

     
     
@@ -587,7 +587,7 @@
 
                 

                 
-                    

+                    

                     
                         
函数（Functions）

 
本页包含内容：

@@ -605,67 +605,67 @@
 
当你定义一个函数时，你可以定义一个或多个有名字和类型的值，作为函数的输入（称为参数，parameters），也可以定义某种类型的值作为函数执行结束的输出（称为返回类型）。

 
每个函数有个函数名，用来描述函数执行的任务。要使用一个函数时，你用函数名“调用”，并传给它匹配的输入值（称作实参，arguments）。一个函数的实参必须与函数参数表里参数的顺序一致。

 
在下面例子中的函数叫做"greetingForPerson"，之所以叫这个名字是因为这个函数用一个人的名字当做输入，并返回给这个人的问候语。为了完成这个任务，你定义一个输入参数-一个叫做personName的String值，和一个包含给这个人问候语的String类型的返回值：

-
        func sayHello(personName: String) -> String {
-            let greeting = "Hello, " + personName + "!"
-            return greeting
-        }
+
func sayHello(personName: String) -> String {
+    let greeting = "Hello, " + personName + "!"
+    return greeting
+}
 
所有的这些信息汇总起来成为函数的定义，并以func作为前缀。指定函数返回类型时，用返回箭头->（一个连字符后跟一个右尖括号）后跟返回类型的名称的方式来表示。

 
该定义描述了函数做什么，它期望接收什么和执行结束时它返回的结果是什么。这样的定义使的函数可以在别的地方以一种清晰的方式被调用：

-
        println(sayHello("Anna"))
-        // prints "Hello, Anna!"
-        println(sayHello("Brian"))
-        // prints "Hello, Brian!
+
println(sayHello("Anna"))
+// prints "Hello, Anna!"
+println(sayHello("Brian"))
+// prints "Hello, Brian!
 
调用sayHello函数时，在圆括号中传给它一个String类型的实参。因为这个函数返回一个String类型的值，sayHello可以被包含在println的调用中，用来输出这个函数的返回值，正如上面所示。

 
在sayHello的函数体中，先定义了一个新的名为greeting的String常量，同时赋值了给personName的一个简单问候消息。然后用return关键字把这个问候返回出去。一旦return greeting被调用，该函数结束它的执行并返回greeting的当前值。

 
你可以用不同的输入值多次调用sayHello。上面的例子展示的是用"Anna"和"Brian"调用的结果，该函数分别返回了不同的结果。

 
为了简化这个函数的定义，可以将问候消息的创建和返回写成一句：

-
        func sayHelloAgain(personName: String) -> String {
-            return "Hello again, " + personName + "!"
-        }
-        println(sayHelloAgain("Anna"))
-        // prints "Hello again, Anna!
+
func sayHelloAgain(personName: String) -> String {
+    return "Hello again, " + personName + "!"
+}
+println(sayHelloAgain("Anna"))
+// prints "Hello again, Anna!
 
函数参数与返回值（Function Parameters and Return Values）

 
函数参数与返回值在Swift中极为灵活。你可以定义任何类型的函数，包括从只带一个未名参数的简单函数到复杂的带有表达性参数名和不同参数选项的复杂函数。

 
多重输入参数（Multiple Input Parameters）

 
函数可以有多个输入参数，写在圆括号中，用逗号分隔。

 
下面这个函数用一个半开区间的开始点和结束点，计算出这个范围内包含多少数字：

-
        func halfOpenRangeLength(start: Int, end: Int) -> Int {
-            return end - start
-        }
-        println(halfOpenRangeLength(1, 10))
-        // prints "9
+
func halfOpenRangeLength(start: Int, end: Int) -> Int {
+    return end - start
+}
+println(halfOpenRangeLength(1, 10))
+// prints "9
 
无参函数（Functions Without Parameters）

 
函数可以没有参数。下面这个函数就是一个无参函数，当被调用时，它返回固定的String消息：

-
        func sayHelloWorld() -> String {
-            return "hello, world"
-        }
-        println(sayHelloWorld())
-        // prints "hello, world
+
func sayHelloWorld() -> String {
+    return "hello, world"
+}
+println(sayHelloWorld())
+// prints "hello, world
 
尽管这个函数没有参数，但是定义中在函数名后还是需要一对圆括号。当被调用时，也需要在函数名后写一对圆括号。

 
无返回值函数（Functions Without Return Values）

 
函数可以没有返回值。下面是sayHello函数的另一个版本，叫waveGoodbye，这个函数直接输出String值，而不是返回它：

-
        func sayGoodbye(personName: String) {
-            println("Goodbye, \(personName)!")
-        }
-        sayGoodbye("Dave")
-        // prints "Goodbye, Dave!
+
func sayGoodbye(personName: String) {
+    println("Goodbye, \(personName)!")
+}
+sayGoodbye("Dave")
+// prints "Goodbye, Dave!
 
因为这个函数不需要返回值，所以这个函数的定义中没有返回箭头（->）和返回类型。

 

 
注意：
 严格上来说，虽然没有返回值被定义，sayGoodbye函数依然返回了值。没有定义返回类型的函数会返回特殊的值，叫Void。它其实是一个空的元组（tuple），没有任何元素，可以写成()。

 

 
被调用时，一个函数的返回值可以被忽略：

-
        func printAndCount(stringToPrint: String) -> Int {
-            println(stringToPrint)
-            return countElements(stringToPrint)
-        }
-        func printWithoutCounting(stringToPrint: String) {
-            printAndCount(stringToPrint)
-        }
-        printAndCount("hello, world")
-        // prints "hello, world" and returns a value of 12
-        printWithoutCounting("hello, world")
-        // prints "hello, world" but does not return a value
+
func printAndCount(stringToPrint: String) -> Int {
+    println(stringToPrint)
+    return countElements(stringToPrint)
+}
+func printWithoutCounting(stringToPrint: String) {
+    printAndCount(stringToPrint)
+}
+printAndCount("hello, world")
+// prints "hello, world" and returns a value of 12
+printWithoutCounting("hello, world")
+// prints "hello, world" but does not return a value
 
第一个函数printAndCount，输出一个字符串并返回Int类型的字符数。第二个函数printWithoutCounting调用了第一个函数，但是忽略了它的返回值。当第二个函数被调用时，消息依然会由第一个函数输出，但是返回值不会被用到。

 

 
注意：
@@ -674,59 +674,59 @@
 
多重返回值函数（Functions with Multiple Return Values）

 
你可以用元组（tuple）类型让多个值作为一个复合值从函数中返回。

 
下面的这个例子中，count函数用来计算一个字符串中元音，辅音和其他字母的个数（基于美式英语的标准）。

-
        func count(string: String) -> (vowels: Int, consonants: Int, others: Int) {
-            var vowels = 0, consonants = 0, others = 0
-            for character in string {
-                switch String(character).lowercaseString {
-                case "a", "e", "i", "o", "u":
-                       ++vowels
-                case "b", "c", "d", "f", "g", "h", "j", "k", "l", "m",
-                "n", "p", "q", "r", "s", "t", "v", "w", "x", "y", "z":
-                    ++consonants
-                default:
-                    ++others
-                }
-            }
-            return (vowels, consonants, others)
+
func count(string: String) -> (vowels: Int, consonants: Int, others: Int) {
+    var vowels = 0, consonants = 0, others = 0
+    for character in string {
+        switch String(character).lowercaseString {
+        case "a", "e", "i", "o", "u":
+            ++vowels
+        case "b", "c", "d", "f", "g", "h", "j", "k", "l", "m",
+          "n", "p", "q", "r", "s", "t", "v", "w", "x", "y", "z":
+            ++consonants
+        default:
+            ++others
         }
+    }
+    return (vowels, consonants, others)
+}
 
你可以用count函数来处理任何一个字符串，返回的值将是一个包含三个Int型值的元组（tuple）：

-
        let total = count("some arbitrary string!")
-        println("\(total.vowels) vowels and \(total.consonants) consonants")
-        // prints "6 vowels and 13 consonants
+
let total = count("some arbitrary string!")
+println("\(total.vowels) vowels and \(total.consonants) consonants")
+// prints "6 vowels and 13 consonants
 
需要注意的是，元组的成员不需要在函数中返回时命名，因为它们的名字已经在函数返回类型有有了定义。

 
函数参数名（Function Parameter Names）

 
以上所有的函数都给它们的参数定义了参数名（parameter name）：

-
        func someFunction(parameterName: Int) {
-            // function body goes here, and can use parameterName
-            // to refer to the argument value for that parameter
-        }
+
func someFunction(parameterName: Int) {
+    // function body goes here, and can use parameterName
+    // to refer to the argument value for that parameter
+}
 
但是，这些参数名仅在函数体中使用，不能在函数调用时使用。这种类型的参数名被称作局部参数名（local parameter name），因为它们只能在函数体中使用。

 
外部参数名（External Parameter Names）

 
有时候，调用函数时，给每个参数命名是非常有用的，因为这些参数名可以指出各个实参的用途是什么。

 
如果你希望函数的使用者在调用函数时提供参数名字，那就需要给每个参数除了局部参数名外再定义一个外部参数名。外部参数名写在局部参数名之前，用空格分隔。

-
        func someFunction(externalParameterName localParameterName: Int) {
-            // function body goes here, and can use localParameterName
-            // to refer to the argument value for that parameter
-        }
+
func someFunction(externalParameterName localParameterName: Int) {
+    // function body goes here, and can use localParameterName
+    // to refer to the argument value for that parameter
+}
 

 
注意：
 如果你提供了外部参数名，那么函数在被调用时，必须使用外部参数名。

 

 
以下是个例子，这个函数使用一个结合者（joiner）把两个字符串联在一起：

-
        func join(s1: String, s2: String, joiner: String) -> String {
-            return s1 + joiner + s2
-        }
+
func join(s1: String, s2: String, joiner: String) -> String {
+    return s1 + joiner + s2
+}
 
当你调用这个函数时，这三个字符串的用途是不清楚的：

-
        join("hello", "world", ", ")
-        // returns "hello, world
+
join("hello", "world", ", ")
+// returns "hello, world
 
为了让这些字符串的用途更为明显，我们为join函数添加外部参数名：

-
        func join(string s1: String, toString s2: String, withJoiner joiner: String) -> String {
-                return s1 + joiner + s2
-        }
+
func join(string s1: String, toString s2: String, withJoiner joiner: String) -> String {
+    return s1 + joiner + s2
+}
 
在这个版本的join函数中，第一个参数有一个叫string的外部参数名和s1的局部参数名，第二个参数有一个叫toString的外部参数名和s2的局部参数名，第三个参数有一个叫withJoiner的外部参数名和joiner的局部参数名。

 
现在，你可以使用这些外部参数名以一种清晰地方式来调用函数了：

-
        join(string: "hello", toString: "world", withJoiner: ", ")
-        // returns "hello, world
+
join(string: "hello", toString: "world", withJoiner: ", ")
+// returns "hello, world
 
使用外部参数名让第二个版本的join函数的调用更为有表现力，更为通顺，同时还保持了函数体是可读的和有明确意图的。

 

 
注意：
@@ -735,17 +735,17 @@
 
简写外部参数名（Shorthand External Parameter Names）

 
如果你需要提供外部参数名，但是局部参数名已经定义好了，那么你不需要写两次这些参数名。相反，只写一次参数名，并用井号（#）作为前缀就可以了。这告诉Swift使用这个参数名作为局部和外部参数名。

 
下面这个例子定义了一个叫containsCharacter的函数，使用井号（#）的方式定义了外部参数名：

-
        func containsCharacter(#string: String, #characterToFind: Character) -> Bool {
-            for character in string {
-                if character == characterToFind {
-                    return true
-                }
-            }
-            return false
+
func containsCharacter(#string: String, #characterToFind: Character) -> Bool {
+    for character in string {
+        if character == characterToFind {
+            return true
         }
+    }
+    return false
+}
 
这样定义参数名，使得函数体更为可读，清晰，同时也可以以一个不含糊的方式被调用：

-
        let containsAVee = containsCharacter(string: "aardvark", characterToFind: "v")
-        // containsAVee equals true, because "aardvark" contains a "v”
+
let containsAVee = containsCharacter(string: "aardvark", characterToFind: "v")
+// containsAVee equals true, because "aardvark" contains a "v”
 
默认参数值（Default Parameter Values）

 
你可以在函数体中为每个参数定义默认值。当默认值被定义后，调用这个函数时可以略去这个参数。

 

@@ -753,25 +753,25 @@
 将带有默认值的参数放在函数参数表的最后。这样可以保证在函数调用时，非默认参数的顺序是一致的，同时使得相同的函数在不同情况下调用时显得更为清晰。

 

 
以下是另一个版本的join函数，其中joiner有了默认参数值：

-
        func join(string s1: String, toString s2: String, withJoiner joiner: String = " ") -> String {
-            return s1 + joiner + s2
-        }
+
func join(string s1: String, toString s2: String, withJoiner joiner: String = " ") -> String {
+    return s1 + joiner + s2
+}
 
像第一个版本的join函数一样，如果joiner被幅值时，函数将使用这个字符串值来连接两个字符串：

-
        join(string: "hello", toString: "world", withJoiner: "-")
-        // returns "hello-world
+
join(string: "hello", toString: "world", withJoiner: "-")
+// returns "hello-world
 
当这个函数被调用时，如果joiner的值没有被指定，函数会使用默认值（" "）：

-
        join(string: "hello", toString:"world")
-        // returns "hello world"
+
join(string: "hello", toString:"world")
+// returns "hello world"
 
默认值参数的外部参数名（External Names for Parameters with Default Values）

 
在大多数情况下，给带默认值的参数起一个外部参数名是很有用的。这样可以保证当函数被调用且带默认值的参数被提供值时，实参的意图是明显的。

 
为了使定义外部参数名更加简单，当你未给带默认值的参数提供外部参数名时，Swift会自动提供外部名字。此时外部参数名与局部名字是一样的，就像你已经在局部参数名前写了井号（#）一样。

 
下面是join函数的另一个版本，这个版本中并没有为它的参数提供外部参数名，但是joiner参数依然有外部参数名：

-
        func join(s1: String, s2: String, joiner: String = " ") -> String {
-            return s1 + joiner + s2
-        }
+
func join(s1: String, s2: String, joiner: String = " ") -> String {
+    return s1 + joiner + s2
+}
 
在这个例子中，Swift自动为joiner提供了外部参数名。因此，当函数调用时，外部参数名必须使用，这样使得参数的用途变得清晰。

-
        join("hello", "world", joiner: "-")
-        // returns "hello-world"
+
join("hello", "world", joiner: "-")
+// returns "hello-world"
 

 
注意：
 你可以使用下划线（_）作为默认值参数的外部参数名，这样可以在调用时不用提供外部参数名。但是给带默认值的参数命名总是更加合适的。

@@ -780,17 +780,17 @@
 
一个可变参数（variadic parameter）可以接受一个或多个值。函数调用时，你可以用可变参数来传入不确定数量的输入参数。通过在变量类型名后面加入（...）的方式来定义可变参数。

 
传入可变参数的值在函数体内当做这个类型的一个数组。例如，一个叫做numbers的Double...型可变参数，在函数体内可以当做一个叫numbers的Double[]型的数组常量。

 
下面的这个函数用来计算一组任意长度数字的算术平均数：

-
        func arithmeticMean(numbers: Double...) -> Double {
-            var total: Double = 0
-            for number in numbers {
-                total += number
-            }
-            return total / Double(numbers.count)
-        }
-        arithmeticMean(1, 2, 3, 4, 5)
-        // returns 3.0, which is the arithmetic mean of these five numbers
-        arithmeticMean(3, 8, 19)
-        // returns 10.0, which is the arithmetic mean of these three numbers
+
func arithmeticMean(numbers: Double...) -> Double {
+    var total: Double = 0
+    for number in numbers {
+          total += number
+    }
+    return total / Double(numbers.count)
+}
+arithmeticMean(1, 2, 3, 4, 5)
+// returns 3.0, which is the arithmetic mean of these five numbers
+arithmeticMean(3, 8, 19)
+// returns 10.0, which is the arithmetic mean of these three numbers
 

 
注意：
 一个函数至多能有一个可变参数，而且它必须是参数表中最后的一个。这样做是为了避免函数调用时出现歧义。

@@ -800,17 +800,17 @@
 
函数参数默认是常量。试图在函数体中更改参数值将会导致编译错误。这意味着你不能错误地更改参数值。

 
但是，有时候，如果函数中有传入参数的变量值副本将是很有用的。你可以通过指定一个或多个参数为变量参数，从而避免自己在函数中定义新的变量。变量参数不是常量，你可以在函数中把它当做新的可修改副本来使用。

 
通过在参数名前加关键字var来定义变量参数：

-
        func alignRight(var string: String, count: Int, pad: Character) -> String {
-            let amountToPad = count - countElements(string)
-            for _ in 1...amountToPad {
-                string = pad + string
-            }
-            return string
-        }
-        let originalString = "hello"
-        let paddedString = alignRight(originalString, 10, "-")
-        // paddedString is equal to "-----hello"
-        // originalString is still equal to "hello”
+
func alignRight(var string: String, count: Int, pad: Character) -> String {
+    let amountToPad = count - countElements(string)
+    for _ in 1...amountToPad {
+        string = pad + string
+    }
+    return string
+}
+let originalString = "hello"
+let paddedString = alignRight(originalString, 10, "-")
+// paddedString is equal to "-----hello"
+// originalString is still equal to "hello"
 
这个例子中定义了一个新的叫做alignRight的函数，用来右对齐输入的字符串到一个长的输出字符串中。左侧空余的地方用指定的填充字符填充。这个例子中，字符串"hello"被转换成了"-----hello"。

 
alignRight函数将参数string定义为变量参数。这意味着string现在可以作为一个局部变量，用传入的字符串值初始化，并且可以在函数体中进行操作。

 
该函数首先计算出多少个字符需要被添加到string的左边，以右对齐到总的字符串中。这个值存在局部常量amountToPad中。这个函数然后将amountToPad多的填充（pad）字符填充到string左边，并返回结果。它使用了string这个变量参数来进行所有字符串操作。

@@ -827,18 +827,18 @@
 输入输出参数不能有默认值，而且变量参数不能用inout标记。如果你用inout标记一个参数，这个参数不能别var或者let标记。

 

 
下面是例子，swapTwoInts函数，有两个分别叫做a和b的输出输出参数：

-
        func swapTwoInts(inout a: Int, inout b: Int) {
-            let temporaryA = a
-            a = b
-            b = temporaryA
-        }
+
func swapTwoInts(inout a: Int, inout b: Int) {
+    let temporaryA = a
+    a = b
+    b = temporaryA
+}
 
这个swapTwoInts函数仅仅交换a与b的值。该函数先将a的值存到一个暂时常量temporaryA中，然后将b的值赋给a，最后将temporaryA幅值给b。

 
你可以用两个Int型的变量来调用swapTwoInts。需要注意的是，someInt和anotherInt在传入swapTwoInts函数前，都加了&的前缀：

-
        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”
+
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”
 
从上面这个例子中，我们可以看到someInt和anotherInt的原始值在swapTwoInts函数中被修改，尽管它们的定义在函数体外。

 

 
注意：
@@ -847,98 +847,98 @@
 
函数类型（Function Types）

 
每个函数都有种特定的函数类型，由函数的参数类型和返回类型组成。

 
例如：

-
        func addTwoInts(a: Int, b: Int) -> Int {
-            return a + b
-        }
-        func multiplyTwoInts(a: Int, b: Int) -> Int {
-            return a * b
-        }
+
func addTwoInts(a: Int, b: Int) -> Int {
+    return a + b
+}
+func multiplyTwoInts(a: Int, b: Int) -> Int {
+    return a * b
+}
 
这个例子中定义了两个简单的数学函数：addTwoInts和multiplyTwoInts。这两个函数都传入两个Int类型， 返回一个合适的Int值。

 
这两个函数的类型是(Int, Int) -> Int，可以读作“这个函数类型，它有两个Int型的参数并返回一个Int型的值。”。

 
下面是另一个例子，一个没有参数，也没有返回值的函数：

-
        func printHelloWorld() {
-            println("hello, world")
-        }
+
func printHelloWorld() {
+    println("hello, world")
+}
 
这个函数的类型是：() -> ()，或者叫“没有参数，并返回Void类型的函数。”。没有指定返回类型的函数总返回    Void。在Swift中，Void与空的元组是一样的。

 
使用函数类型（Using Function Types）

 
在Swift中，使用函数类型就像使用其他类型一样。例如，你可以定义一个常量或变量，它的类型是函数，并且可以幅值为一个函数：

-
        var mathFunction: (Int, Int) -> Int = addTwoInts
+
var mathFunction: (Int, Int) -> Int = addTwoInts
 
这个可以读作：

 
“定义一个叫做mathFunction的变量，类型是‘一个有两个Int型的参数并返回一个Int型的值的函数’，并让这个新变量指向addTwoInts函数”。

 
addTwoInts和mathFunction有同样的类型，所以这个赋值过程在Swift类型检查中是允许的。

 
现在，你可以用mathFunction来调用被赋值的函数了：

-
        println("Result: \(mathFunction(2, 3))")
-        // prints "Result: 5
+
println("Result: \(mathFunction(2, 3))")
+// prints "Result: 5
 
有相同匹配类型的不同函数可以被赋值给同一个变量，就像非函数类型的变量一样：

-
        mathFunction = multiplyTwoInts
-        println("Result: \(mathFunction(2, 3))")
-        // prints "Result: 6"
+
mathFunction = multiplyTwoInts
+println("Result: \(mathFunction(2, 3))")
+// prints "Result: 6"
 
就像其他类型一样，当赋值一个函数给常量或变量时，你可以让Swift来推测其函数类型：

-
        let anotherMathFunction = addTwoInts
-        // anotherMathFunction is inferred to be of type (Int, Int) -> Int
+
let anotherMathFunction = addTwoInts
+// anotherMathFunction is inferred to be of type (Int, Int) -> Int
 
函数类型作为参数类型（Function Types as Parameter Types）

 
你可以用(Int, Int) -> Int这样的函数类型作为另一个函数的参数类型。这样你可以将函数的一部分实现交由给函数的调用者。

 
下面是另一个例子，正如上面的函数一样，同样是输出某种数学运算结果：

-
        func printMathResult(mathFunction: (Int, Int) -> Int, a: Int, b: Int) {
-            println("Result: \(mathFunction(a, b))")
-        }
-        printMathResult(addTwoInts, 3, 5)
-        // prints "Result: 8”
+
func printMathResult(mathFunction: (Int, Int) -> Int, a: Int, b: Int) {
+    println("Result: \(mathFunction(a, b))")
+}
+printMathResult(addTwoInts, 3, 5)
+// prints "Result: 8”
 
这个例子定义了printMathResult函数，它有三个参数：第一个参数叫mathFunction，类型是(Int, Int) -> Int，你可以传入任何这种类型的函数；第二个和第三个参数叫a和b，它们的类型都是Int，这两个值作为已给的函数的输入值。

 
当printMathResult被调用时，它被传入addTwoInts函数和整数3和5。它用传入3和5调用addTwoInts，并输出结果：8。

 
printMathResult函数的作用就是输出另一个合适类型的数学函数的调用结果。它不关心传入函数是如何实现的，它只关心这个传入的函数类型是正确的。这使得printMathResult可以以一种类型安全（type-safe）的方式来保证传入函数的调用是正确的。

 
函数类型作为返回类型（Function Type as Return Types）

 
你可以用函数类型作为另一个函数的返回类型。你需要做的是在返回箭头（->）后写一个完整的函数类型。

 
下面的这个例子中定义了两个简单函数，分别是stepForward和stepBackward。stepForward函数返回一个比输入值大一的值。stepBackward函数返回一个比输入值小一的值。这两个函数的类型都是(Int) -> Int：

-
        func stepForward(input: Int) -> Int {
-            return input + 1
-        }
-        func stepBackward(input: Int) -> Int {
-            return input - 1
-        }
+
func stepForward(input: Int) -> Int {
+    return input + 1
+}
+func stepBackward(input: Int) -> Int {
+    return input - 1
+}
 
下面这个叫做chooseStepFunction的函数，它的返回类型是(Int) -> Int的函数。chooseStepFunction根据布尔值backwards来返回stepForward函数或stepBackward函数：

-
        func chooseStepFunction(backwards: Bool) -> (Int) -> Int {
-            return backwards ? stepBackward : stepForward
-        }
+
func chooseStepFunction(backwards: Bool) -> (Int) -> Int {
+    return backwards ? stepBackward : stepForward
+}
 
你现在可以用chooseStepFunction来获得一个函数，不管是那个方向：

-
        var currentValue = 3
-        let moveNearerToZero = chooseStepFunction(currentValue > 0)
-        // moveNearerToZero now refers to the stepBackward() function
+
var currentValue = 3
+let moveNearerToZero = chooseStepFunction(currentValue > 0)
+// moveNearerToZero now refers to the stepBackward() function
 
上面这个例子中计算出从currentValue逐渐接近到0是需要向正数走还是向负数走。currentValue的初始值是3，这意味着currentValue > 0是真的（true），这将使得chooseStepFunction返回stepBackward函数。一个指向返回的函数的引用保存在了moveNearerToZero常量中。

 
现在，moveNearerToZero指向了正确的函数，它可以被用来数到0：

-
        println("Counting to zero:")
-        // Counting to zero:
-        while currentValue != 0 {
-            println("\(currentValue)... ")
-            currentValue = moveNearerToZero(currentValue)
-        }
-        println("zero!")
-        // 3...
-        // 2...
-        // 1...
-        // zero!
+
println("Counting to zero:")
+// Counting to zero:
+while currentValue != 0 {
+    println("\(currentValue)... ")
+    currentValue = moveNearerToZero(currentValue)
+}
+println("zero!")
+// 3...
+// 2...
+// 1...
+// zero!
 
嵌套函数（Nested Functions）

 
这章中你所见到的所有函数都叫全局函数（global functions），它们定义在全局域中。你也可以把函数定义在别的函数体中，称作嵌套函数（nested functions）。

 
默认情况下，嵌套函数是对外界不可见的，但是可以被他们封闭函数（enclosing function）来调用。一个封闭函数也可以返回它的某一个嵌套函数，使得这个函数可以在其他域中被使用。

 
你可以用返回嵌套函数的方式重写chooseStepFunction函数：

-
        func chooseStepFunction(backwards: Bool) -> (Int) -> Int {
-            func stepForward(input: Int) -> Int { return input + 1 }
-            func stepBackward(input: Int) -> Int { return input - 1 }
-            return backwards ? stepBackward : stepForward
-        }
-        var currentValue = -4
-        let moveNearerToZero = chooseStepFunction(currentValue > 0)
-        // moveNearerToZero now refers to the nested stepForward() function
-        while currentValue != 0 {
-            println("\(currentValue)... ")
-            currentValue = moveNearerToZero(currentValue)
-        }
-        println("zero!")
-        // -4...
-        // -3...
-        // -2...
-        // -1...
-        // zero!
+
func chooseStepFunction(backwards: Bool) -> (Int) -> Int {
+    func stepForward(input: Int) -> Int { return input + 1 }
+    func stepBackward(input: Int) -> Int { return input - 1 }
+    return backwards ? stepBackward : stepForward
+}
+var currentValue = -4
+let moveNearerToZero = chooseStepFunction(currentValue > 0)
+// moveNearerToZero now refers to the nested stepForward() function
+while currentValue != 0 {
+    println("\(currentValue)... ")
+    currentValue = moveNearerToZero(currentValue)
+}
+println("zero!")
+// -4...
+// -3...
+// -2...
+// -1...
+// zero!
 

                     
                     

diff --git a/chapter2/07_Closures.html b/chapter2/07_Closures.html
index 0cabd98a..56404674 100644
--- a/chapter2/07_Closures.html
+++ b/chapter2/07_Closures.html
@@ -46,7 +46,7 @@
 
 
         
-    

+    

     

     
     
@@ -587,7 +587,7 @@
 
                 

                 
-                    

+                    

                     
                         
闭包

 

diff --git a/chapter2/08_Enumerations.html b/chapter2/08_Enumerations.html
index 4d4c2f23..589a6471 100644
--- a/chapter2/08_Enumerations.html
+++ b/chapter2/08_Enumerations.html
@@ -46,7 +46,7 @@
 
 
         
-    

+    

     

     
     
@@ -587,7 +587,7 @@
 
                 

                 
-                    

+                    

                     
                         
枚举

 
本页内容包含：

diff --git a/chapter2/09_Classes_and_Structures.html b/chapter2/09_Classes_and_Structures.html
index 57716d35..75687ff2 100644
--- a/chapter2/09_Classes_and_Structures.html
+++ b/chapter2/09_Classes_and_Structures.html
@@ -46,7 +46,7 @@
 
 
         
-    

+    

     

     
     
@@ -587,7 +587,7 @@
 
                 

                 
-                    

+                    

                     
                         
类和结构体

 
本页包含内容：

diff --git a/chapter2/10_Properties.html b/chapter2/10_Properties.html
index e27f9cc2..129847e9 100644
--- a/chapter2/10_Properties.html
+++ b/chapter2/10_Properties.html
@@ -46,7 +46,7 @@
 
 
         
-    

+    

     

     
     
@@ -587,15 +587,25 @@
 
                 

                 
-                    

+                    

                     
                         
属性 (Properties)

+

+
本页包含内容：

+
 
属性将值跟特定的类、结构或枚举关联。一种是存储属性，把常量或变量的值作为实例的一部分，一种是计算属性，它计算一个值。计算属性可以用于类、结构和枚举里，存储属性只能用于类和结构。

 
存储属性和计算属性通常用于特定类型的实例，但是，属性也可以直接用于类型本身，这种属性称为类属性。

 
另外，还可以定义属性监视器来监控属性值的变化，以此来触发一个自定义的操作。属性监视器可以添加到自己写的存储属性上，也可以添加到从父类继承的属性上。

+

 
存储属性

 
简单来说，一个存储属性就是一个特定类型实例里表示常量或变量的部分，存储属性可以是变量存储属性（用关键字var定义），也可以是常量存储属性（用关键字let定义）。

-
可以在定义存储属性的时候指定默认值，详见默认属性值一节。也可以在初始化阶段设置或修改存储属性的值，甚至修改常量存储属性的值，详见在初始化阶段修改常量存储属性一节。

+
可以在定义存储属性的时候指定默认值，详见默认属性值一节。也可以在初始化阶段设置或修改存储属性的值，甚至修改常量存储属性的值，详见在初始化阶段修改常量存储属性一节。

 
下面的例子定义了一个名为FixedLengthRange的结构体，表示一个在创建后无法修改整数范围的类型：

 
struct FixedLengthRange {
     var firstValue: Int
@@ -606,6 +616,7 @@ var rangeOfThreeItems = FixedLengthRange(firstValue: 0, length: 3)
 rangeOfThreeItems.firstValue = 6
 // the range now represents integer values 6, 7, and 8
 
FixedLengthRange的实例包含一个名为firstValue的变量存储属性和一个名为length的常量存储属性。在上面的例子中，length在创建实例的时候被赋值，因为它是一个常量存储属性，所以无法修改它的值。

+

 
常量和存储属性

 
如果创建了一个结构体的实例并赋值给一个常量，则无法修改实例的任何属性，即使定义了变量存储属性：

 
let rangeOfFourItems = FixedLengthRange(firstValue: 0, length: 4)
@@ -650,10 +661,12 @@ manager.data += "Some more data"
 
println(manager.importer.fileName)
 // the DataImporter instance for the importer property has now been created
 // prints "data.txt”
-
存储属性和实例变量

+

+
存储属性和实例变量

 
如果您有过 Objective-C 经验，应该知道有两种方式在类实例存储值和引用。对于属性来说，也可以使用实例变量作为属性值的后端存储。

 
Swift 编程语言中把这些理论统一用属性来实现。Swift 中的属性没有对应的实例变量，属性的后端存储也无法直接访问。这就避免了不同场景下访问方式的困扰，同时也将属性的定义简化成一个语句。
 一个类型中属性的全部信息——包括命名、类型和内存管理特征——都在唯一一个地方定义。

+

 
计算属性

 
除存储属性外，类、结构体和枚举可以定义计算属性，计算属性不直接存储值，而是提供一个 getter 来获取值，一个可选的 setter 来间接设置其他属性或变量的值。

 
struct Point {
@@ -694,6 +707,7 @@ println("square.origin is now at (\(square.origin.x), \(square.origin.y))&q
 
square的center属性可以通过点运算符（square.center）来访问，这会调用getter来获取属性的值。跟直接返回已经存在的值不同，getter实际上通过计算然后返回一个新的Point实例表示square的中心点。如代码所示，它正确返回了中心点(5, 5)。

 
center属性之后被设置了一个新的值(15, 15)，表示向右上方移动正方形到如图所示橙色正方形的位置。设置属性center的值会调用setter来修改属性origin的x和y的值，从而实现移动正方形到新的位置。

 
Computed Properties sample

+

 
便捷 setter 声明

 
如果计算属性的 setter 没有定义表示新值的参数名，则可以使用默认名称newValue。下面是使用了便捷 setter 声明的Rect结构体代码：

 
struct AlternativeRect {
@@ -711,7 +725,8 @@ println("square.origin is now at (\(square.origin.x), \(square.origin.y))&q
     }
     }
 }
-
只读计算属性

+

+
只读计算属性

 
只有 getter 没有 setter 的计算属性就是只读计算属性。只读计算属性总是返回一个值，可以通过点运算符访问，但不能设置新的值。

 

 
注意

@@ -729,9 +744,10 @@ println("the volume of fourByFiveByTwo is \(fourByFiveByTwo.volume)")
 // prints "the volume of fourByFiveByTwo is 40.0"
 
这个例子定义了一个名为Cuboid的结构体，表示三维空间的立方体，包含width、height和depth属性，还有一个名为volume的只读计算属性用来返回立方体的体积，设置volume的值毫无意义，因为无法确定width、height和depth的值。

 
尽管如此，Cuboid提供一个只读计算属性来让外部用户直接获取体积是很有用的。

+

 
属性监视器

 
属性监视器监控和响应属性值的变化，每次属性被设置值的时候都会调用属性监视器，甚至新的值和现在的值相同的时候也不例外。

-
可以为除了延迟存储属性之外的其他存储属性添加属性监视器，也可以通过重载属性的方式为继承的属性（包括存储属性和计算属性）添加属性监视器。属性重载详见重载一节。

+
可以为除了延迟存储属性之外的其他存储属性添加属性监视器，也可以通过重载属性的方式为继承的属性（包括存储属性和计算属性）添加属性监视器。属性重载详见重载一节。

 

 
注意

 
不需要为无法重载的计算属性添加属性监视器，因为可以通过 setter 直接监控和响应值的变化。

@@ -778,6 +794,7 @@ stepCounter.totalSteps = 896
 
注意

 
如果在didSet监视器里为属性赋值，这个值会替换监视器之前设置的值。

 

+

 
全局变量和局部变量

 
计算属性和属性监视器所描述的模式也可以用于全局变量和局部变量，全局变量是在函数、方法、闭包或任何类型之外定义的变量，局部变量是在函数、方法或闭包内部定义的变量。

 
前面章节提到的全局或局部变量都属于存储型变量，跟存储属性类似，它提供特定类型的存储空间，并允许读取和写入。

@@ -787,6 +804,7 @@ stepCounter.totalSteps = 896
 
全局的常量或变量都是延迟计算的，跟延迟存储属性相似，不同的地方在于，全局的常量或变量不需要标记@lazy特性。

 
局部范围的常量或变量不会延迟计算。

 
+

 
类属性

 
实例的属性属于一个特定类型实例，每次类型实例化后都拥有自己的一套属性值，实例之间的属性相互独立。

 
也可以为类型本身定义属性，不管类型有多少个实例，这些属性都只有唯一一份。这种属性就是类属性。

@@ -797,6 +815,7 @@ stepCounter.totalSteps = 896
 
注意

 
跟实例的存储属性不同，必须给存储型类属性指定默认值，因为类型本身无法在初始化过程中使用构造器给类属性赋值。

 
+

 
类属性语法

 
在 C 或 Objective-C 中，静态常量和静态变量的定义是通过特定类型加上global关键字。在 Swift 编程语言中，类属性是作为类型定义的一部分写在类型最外层的花括号内，因此它的作用范围也就在类型支持的范围内。

 
使用关键字static来定义值类型的类属性，关键字class来为类（class）定义类属性。下面的例子演示了存储型和计算型类属性的语法：

@@ -821,6 +840,7 @@ class SomeClass {
 
注意

 
例子中的计算型类属性是只读的，但也可以定义可读可写的计算型类属性，跟实例计算属性的语法类似。

 
+

 
获取和设置类属性的值

 
跟实例的属性一样，类属性的访问也是通过点运算符来进行，但是，类属性是通过类型本身来获取和设置，而不是通过实例。比如：

 
println(SomeClass.computedTypeProperty)
diff --git a/chapter2/11_Methods.html b/chapter2/11_Methods.html
index 162bfc31..1bf8c412 100644
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方法(Methods)

 
方法是与某些特定类型相关联的函数。类、结构体、枚举都可以定义实例方法；实例方法为给定类型的实例封装了具体的任务与功能。类、结构体、枚举也可以定义类型方法；类型方法与类型自身相关联。类型方法与Objective-C中的类方法(class methods)相似。

diff --git a/chapter2/12_Subscripts.html b/chapter2/12_Subscripts.html
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下标 (Subscripts)

 
下标可以定义在类(Class)、结构体(structures)和枚举(enumerations)这些目标中，可以认为是访问对象、集合或序列的快捷方式。举例来说，用下标访问一个数组(Array)实例中的元素可以这样写 someArray[index] ，访问字典(Dictionary)实例中的元素可以这样写 someDictionary[key]，而不需要再调用实例的某个方法来获得元素的值。

diff --git a/chapter2/13_Inheritance.html b/chapter2/13_Inheritance.html
index ff62b802..1bb29883 100644
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继承

 
一个类可以继承另一个类的方法，属性和其它特性。当一个类继承其它类，继承类叫子类，被继承类叫超类（或父类）。在Swift中，继承是区分「类」与其它类型的一个基本特征。

diff --git a/chapter2/14_Initialization.html b/chapter2/14_Initialization.html
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diff --git a/chapter2/15_Deinitialization.html b/chapter2/15_Deinitialization.html
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析构过程

 
在一个类的实例被释放之前，析构函数被立即调用。用关键字deinit来标示析构函数，类似于初始化函数用init来标示。析构函数只适用于类类型。

diff --git a/chapter2/16_Automatic_Reference_Counting.html b/chapter2/16_Automatic_Reference_Counting.html
index 083fc44a..bb594d3f 100644
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自动引用计数

 
本页包含内容：

diff --git a/chapter2/17_Optional_Chaining.html b/chapter2/17_Optional_Chaining.html
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Optional Chaining

 
可选链（Optional Chaining）是一种可以请求和调用属性、方法及子脚本的过程，它的自判断性体现于请求或调用的目标当前可能为空（nil）。如果自判断的目标有值，那么调用就会成功；相反，如果选择的目标为空（nil），则这种调用将返回空（nil）。多次请求或调用可以被链接在一起形成一个链，如果任何一个节点为空（nil）将导致整个链失效。

diff --git a/chapter2/18_Type_Casting.html b/chapter2/18_Type_Casting.html
index 1414f8d2..3f316d07 100644
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类型检查（Type Casting）

 
（ps：为了方便各位检验所以保留了英文，可删。）
diff --git a/chapter2/19_Nested_Types.html b/chapter2/19_Nested_Types.html
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类型嵌套

 
本页包含内容：

diff --git a/chapter2/20_Extensions.html b/chapter2/20_Extensions.html
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扩展（Extensions）

 

diff --git a/chapter2/21_Protocols.html b/chapter2/21_Protocols.html
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协议

 
Protocol(协议)用于统一方法和属性的名称,而不实现任何功能,(译者注: 协议在其他语言中也称作接口(Interface)).协议能够被类,枚举,结构体实现,满足协议要求的类,枚举,结构体被称为协议的遵循者.

diff --git a/chapter2/22_Generics.html b/chapter2/22_Generics.html
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泛型

 

diff --git a/chapter2/23_Advanced_Operators.html b/chapter2/23_Advanced_Operators.html
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In addition to the operators described in Basic Operators, Swift provides several advanced operators that perform more complex value manipulation. These include all of the bitwise and bit shifting operators you will be familiar with from C and Objective-C.

 
除于基本操作符中所讲的运算符, Swift还有许多复杂的高级运算符, 包括了C语和Objective-C中的位运算符和位移运算.

diff --git a/chapter2/chapter2.html b/chapter2/chapter2.html
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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。

diff --git a/chapter3/01_About_the_Language_Reference.html b/chapter3/01_About_the_Language_Reference.html
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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。

diff --git a/chapter3/02_Lexical_Structure.html b/chapter3/02_Lexical_Structure.html
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语法结构

 
本页包含内容：

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类型（Types）

 

diff --git a/chapter3/04_Expressions.html b/chapter3/04_Expressions.html
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表达式(Expressions)

 

diff --git a/chapter3/05_Declarations.html b/chapter3/05_Declarations.html
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diff --git a/chapter3/06_Attributes.html b/chapter3/06_Attributes.html
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特性

 
特性提供了关于声明和类型的更多信息。在Swift中有两类特性，用于修饰声明的以及用于修饰类型的。例如，required特性，当应用于一个类的指定或便利初始化器声明时，表明它的每个子类都必须实现那个初始化器。再比如noreturn特性，当应用于函数或方法类型时，表明该函数或方法不会返回到它的调用者。

diff --git a/chapter3/07_Patterns.html b/chapter3/07_Patterns.html
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模式（Patterns）

 
模式（pattern）代表了单个值或者复合值的结构。例如，元组(1, 2)的结构是逗号分隔的，包含两个元素的列表。因为模式代表一种值的结构，而不是特定的某个值，你可以把模式和各种同类型的值匹配起来。比如，(x, y)可以匹配元组(1, 2)，以及任何含两个元素的元组。除了将模式与一个值匹配外，你可以从合成值中提取出部分或全部，然后分别把各个部分和一个常量或变量绑定起来。

diff --git a/chapter3/08_Generic_Parameters_and_Arguments.html b/chapter3/08_Generic_Parameters_and_Arguments.html
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泛型参数

 

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语法总结

 
本页包含内容：

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语句

 
在 Swift 中，有两种类型的语句：简单语句和控制流语句。简单语句是最常见的，用于构造表达式和声明。控制流语句则用于控制程序执行的流程，Swift 中有三种类型的控制流语句：循环语句、分支语句和控制传递语句。

diff --git a/chapter3/chapter3.html b/chapter3/chapter3.html
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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》。

diff --git a/manifest.appcache b/manifest.appcache
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 CACHE MANIFEST
-# Revision 1402390224924
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 CACHE:
 index.html
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 chapter2/15_Deinitialization.html
 chapter2/16_Automatic_Reference_Counting.html
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 chapter2/19_Nested_Types.html
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 chapter2/20_Extensions.html
 chapter2/21_Protocols.html
 chapter2/22_Generics.html
@@ -38,8 +38,8 @@ chapter3/05_Declarations.html
 chapter3/02_Lexical_Structure.html
 chapter3/07_Patterns.html
 chapter3/08_Generic_Parameters_and_Arguments.html
-chapter3/09_Summary_of_the_Grammar.html
 chapter3/10_Statements.html
+chapter3/09_Summary_of_the_Grammar.html
 chapter3/chapter3.html
 gitbook/app.js
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某个类型t","findstringindex","findstringindex(arrai","findstringindex(str","findstringindex的泛型版本findindex。请注意这个函数仍然返回int","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","first","firstbit","firstforloop","firstitem","firstprotocol","firstroomnam","firstsixbit","firstvalu","firstvector","fit","five","fiveeight","fiveonezero","fixedincr","fixedlengthrang","fixedlengthrange(firstvalu","fixedlengthrange的实例包含一个名为firstvalue的变量存储属性和一个名为length的常量存储属性。在上面的例子中，length","fixedpoint","fixedpoint.movebyx(2.0","flat","flexibl","float","floating-point","floating-point-","floating-point-liter","floating-point-p","float并指定初始值为4","float表示32","flour","flow章节有该游戏的详细介绍)游戏的新版本.新版本使用dice作为骰子,并且实现了dicegame和dicegamedeleg","flow）中介绍，当考虑一个枚举的成员们时，一个switch语句必须全面。如果忽略了.west这种情况，上面那段代码将无法通过编译，因为它没有考虑到compasspoint","follow","for-condition-incr","for-in","for-in-stat","for-infor条件递增（for-condition-increment）whil","for-init","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fals","for-in循环来遍历某个字典中的键值对。每一个字典中的数据项都由(kei","for-in循环的介绍请参见for","for-in循环请参见for","for-in语句允许在重复执行代码块的同时，迭代集合(或符合sequ","for-in语句在循环开始前会调用collection表达式的generate方法来获取一个生成器类型（这是一个符合generator协议的类型）的值。接下来循环开始，调用collection表达式的next方法。如果其返回值不是none，它将会被赋给item，然后执行statements，执行完毕后回到循环开始处；否则，将不会赋值给item也不会执行statements，for-in","for-in语句或者变量或常量申明时，它可以包含通配符模式，标识符模式或者其他包含这两种模式的模式。例如，下面这段代码是不正确的，因为(x","for-stat","forc","force-unwrap","forced-valu","forced-value-express","forget","forincr","forkei","form","for—that","for条件递增（for-condition-incr","for语句、for-in语句、while语句和do-whil","for语句中，continue语句执行后，increment表达式还是会被计算，这是因为每次循环体执行完毕后incr","found","found"","found")元组把一个int值和一个str","foundat","foundindex","four","fourbyfivebytwo","fourbyfivebytwo.volum","freedom","friar","friendlywelcom","friendlywelcome的值从"hello!"改为了"bonjour!"","fromraw方法来试图找到具有特定原始值的枚举成员。这个例子通过原始值7识别uranu","fromthetop","fruit","fruitsummari","ft","fullnam","fullynam","fullynamed协议含有fullname属性.因此其遵循者必须含有一个名为fullname,类型为str","func","function","function)中，__function__","function-bodi","function-call-express","function-declar","function-head","function-nam","function-result","function-signatur","function-typ","functionality）。这包括在没有权限获取原始源代码的情况下扩展类型的能力（即逆向建模）。扩展和objective-c中的分类(categories)类似。（不过与objective-c不同的是，swift","functions）函数参数与返回值（funct","functions）函数的定义与调用（defin","functions），它们定义在全局域中。你也可以把函数定义在别的函数体中，称作嵌套函数（nest","function）的类型相当于一个嵌套函数类型。例如，下面的柯里化函数addtwonumber()()的类型是int","func作为前缀。指定函数返回类型时，用返回箭头->","func关键字之前加上关键字class；声明结构体和枚举的类型方法，在方法的func关键字之前加上关键字stat","func来声明一个函数，使用名字和参数来调用函数。使用->","g","game","game(gam","game,d12,simothehamst","game.deleg","game.dice.sides)-sid","game.plai","gamedidend(gam","gamedidstart(gam","gamedidstart方法从game参数获取游戏信息并输出.game在方法中被当做dicegame类型而不是snakeandladders类型,所以方法中只能访问dicegam","gameloop","gear","gener","generator.random","generic-argu","generic-argument-claus","generic-argument-clause[opt","generic-argument-clause[opt].type-identifi","generic-argument-list","generic-argument­,­generic-argument-list","generic-paramet","generic-parameter-claus","generic-parameter-list","generic-parameter­,­generic-parameter-list","getgaspric","gettable,但它不要求属性是存储型属性(stor","getter","getter-claus","getter-keyword-claus","getter-sett","getter-setter-block","getter-setter-keyword-block","getter-setter方法​​块可以由一个getter子句后跟一个可选的setter子句构成，用大括号括起来，或者由一个setter子句后跟一个gett","getter/sett","getters和sett","getter和sett","getter获取某个值，或者通过sett","getter（或sett","get代码块中的代码写在subscript","get关键字表示。它们的返回值是double型，而且可以用于所有接受doubl","ghostbust","give","given","global","goe","gonna","good","goodby","grai","grammar","graphem","graphic","great","green","greencompon","greet","greet(\"bob","greet(nam","greeting被调用，该函数结束它的执行并返回greet","grid","grid[(row","group","gt","gt;>","gt;"","guard","guard-claus","guard-express","guess","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(dictionari","h","half-clos","halfopenrangelength(start","hall","halv","hamster","hamster(nam","hamster的实例可以作为textrepresent","handl","happen","happi","harmless","hasanymatches(list","hasanymatches(numb","hasarea","hasarea协议时,通过as?操作符将其可选绑定(opt","hasdoorkei","hash","hashabl","hashable和valuetype产生的。每一个类型实参必须满足它所替代的泛型形参的所有约束，包括任何where语句所指定的额外的要求。上面的例子中，类型形参keytype要求满足hashable协议，因此string也必须满足hash","hashead","hashtabl","hasprefix","hasprefix/hassuffix","hawk","heart","hearts.simpledescript","heartsdescript","heartssymbol","hearts成员：给hearts常量赋值时，枚举成员suit.hearts需要用全名来引用，因为常量没有显式指定类型。在switch里，枚举成员使用缩写.hearts来引用，因为self的值已经知道是一个suit","heathrow","height","height=\"120","height=\"169","height=\"288","height=\"290","height=\"357","height=\"387","hello","hello-world","help","here","here'","here’","hexadecim","hexadecimal-digit","hexadecimal-expon","hexadecimal-fract","hexadecimal-liter","hexadecimal-literal-charact","hexadecimaldoubl","hexadecimalinteg","hierarchi","high","highe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