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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

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:

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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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与其他大部分编程语言不同,Swift 并不强制要求你在每条语句的结尾处使用分号(;),当然,你也可以按照你自己的习惯添加分号。有一种情况下必须要用分号,即你打算在同一行内写多条独立的语句:

let cat = "🐱"; println(cat)
 // prints "🐱"
-
+

整数

+

整数就是没有小数部分的数字,比如42-23。整数可以是有符号(正、负、零)或者无符号(正、零)。

+

Swift 提供了8、16、32和64位的有符号和无符号整数类型。这些整数类型和 C 语言的命名方式很像,比如8位无符号整数类型是UInt8,32位有符号整数类型是Int32。就像 Swift 的其他类型一样,整数类型采用大写命名法。

+

整数范围

+

你可以访问不同整数类型的minmax属性来获取对应类型的最大值和最小值:

+
let minValue = UInt8.min  // minValue 为 0,是 UInt8 类型的最小值
+let maxValue = UInt8.max  // maxValue 为 255,是 UInt8 类型的最大值
+

Int

+

一般来说,你不需要专门指定整数的长度。Swift 提供了一个特殊的整数类型Int,长度与当前平台的原生字长相同:

+
    +
  • 在32位平台上,IntInt32长度相同。
  • +
  • 在64位平台上,IntInt64长度相同。
  • +
+

除非你需要特定长度的整数,一般来说使用Int就够了。这可以提高代码一致性和可复用性。即使是在32位平台上,Int可以存储的整数范围也可以达到-2147483648~2147483647,大多数时候这已经足够大了。

+

UInt

+

Swift 也提供了一个特殊的无符号类型UInt,长度与当前平台的原生字长相同:

+
    +
  • 在32位平台上,UIntUInt32长度相同。
  • +
  • 在64位平台上,UIntUInt64长度相同。
  • +
+
+

注意:尽量不要使用UInt,除非你真的需要存储一个和当前平台原生字长相同的无符号整数。除了这种情况,最好使用Int,即使你要存储的值已知是非负的。统一使用Int可以提高代码的可复用性,避免不同类型数字之间的转换,并且匹配数字的类型推测,详情参见类型安全和类型推测

+
+

浮点数

+

浮点数是有小数部分的数字,比如3.141590.1-273.15

+

浮点类型比整数类型表示的范围更大,可以存储比Int类型更大或者更小的数字。Swift 提供了两种有符号浮点数类型:

+
    +
  • Double表示64位浮点数。当你需要存储很大或者很高精度的浮点数时请使用此类型。
  • +
  • Float表示32位浮点数。精度要求不高的话可以使用此类型。
  • +
+
+

注意:Double精确度很高,至少有15位数字,而Float最少只有6位数字。选择哪个类型取决于你的代码需要处理的数字大小。

+
+

类型安全和类型推测

+

Swift 是一个类型安全的语言。类型安全的语言可以让你清楚地知道代码要处理的值的类型。如果你的代码需要一个String,你绝对不可能不小心传进去一个Int

+

Swift 是类型安全的,会在编译你的代码时进行类型检查,如果遇到不匹配的类型会报错。这可以让你在开发的时候尽早发现并修复错误。

+

当你要处理不同类型的值时,类型检查可以帮你避免错误。然而,这并不是说你每次声明常量和变量的时候都需要显式指定类型。如果你没有显式指定类型,Swift 会使用类型推测来选择合适的类型。有了类型推测,编译器可以在编译代码的时候自动推测出表达式的类型。原理很简单,判断你赋的值即可。

+

因为有类型推测,和 C 或者 Objc 比起来 Swift 很少需要声明类型。常量和变量虽然需要明确类型,但是大部分工作并不需要你自己来完成。

+

当你声明常量或者变量并赋初值的时候类型推测非常有用。当你在声明常量或者变量的时候赋给它们一个原始值即可触发类型推测。(原始值就是会直接出现在你代码中的值,比如423.14159。)

+

举个例子,如果你给一个新常量赋值42并且没有标明类型,Swift 可以推测出常量类型是Int,因为你给它赋的初值看起来很像一个整数:

+
let meaningOfLife = 42
+// meaningOfLife 会被推测为 Int 类型
+

同理,如果你没有给浮点原始值标明类型,Swift 会推测你想要的是Double

+
let pi = 3.14159
+// pi 会被推测为 Double 类型
+

当推测浮点数的类型时,Swift 总是会选择Double而不是Float

+

如果表达式中同时出现了整数和浮点数,会被推测为Double类型:

+
let anotherPi = 3 + 0.14159
+// anotherPi 会被推测为 Double 类型
+

原始值3没有显式声明类型,而表达式中出现了一个浮点原始值,所以表达式会被推测为Double类型。

+

数值类原始值

+

整数原始值可以被写作:

+
    +
  • 一个十进制数,没有前缀
  • +
  • 一个二进制数,前缀是0b
  • +
  • 一个八进制数,前缀是0o
  • +
  • 一个十六进制数,前缀是0x
  • +
+

下面的所有整数原始值的十进制值都是17:

+
let decimalInteger = 17
+let binaryInteger = 0b10001       // 二进制的17
+let octalInteger = 0o21           // 八进制的17
+let hexadecimalInteger = 0x11     // 十六机制的17
+

浮点原始值可以是十进制(没有前缀)或者是十六进制(前缀是0x)。小数点两边必须有至少一个十进制数字(或者是十六进制的数字)。浮点原始值还有一个可选的指数,在十进制浮点数中通过大写或者小写的e来指定,在十六进制浮点数中通过大写或者小写的p来指定。

+

如果一个十进制数的指数为exp,那这个数相当于基数和10^exp的乘积:

+
    +
  • 1.25e2 表示 1.25 × 10^2,等于 125.0。
  • +
  • 1.25e-2 表示 1.25 × 10^-2,等于 0.0125。
  • +
+

如果一个十六进制数的指数为exp,那这个数相当于基数和2^exp的乘积:

+
    +
  • 0xFp2 表示 15 × 2^2,等于 60.0。
  • +
  • 0xFp-2 表示 15 × 2^-2,等于 3.75。
  • +
+

下面的这些浮点原始值都等于十进制的12.1875

+
let decimalDouble = 12.1875
+let exponentDouble = 1.21875e1
+let hexadecimalDouble = 0xC.3p0
+

数值类原始值可以包括额外的格式来增强可读性。整数和浮点数都可以添加额外的零并且包含下划线,并不会影响原始值:

+
let paddedDouble = 000123.456
+let oneMillion = 1_000_000
+let justOverOneMillion = 1_000_000.000_000_1
+

数值类型转换

+

通常来讲,即使代码中的整数常量和变量已知非负,也请使用Int类型。总是使用默认的整数类型可以保证你的整数常量和变量可以直接被复用并且可以匹配整数类原始值的类型推测。 +只有在必要的时候才使用其他整数类型,比如要处理外部的长度明确的数据或者为了优化性能、内存占用等等。使用显式指定长度的类型可以及时发现值溢出并且可以暗示正在处理特殊数据。

+

整数转换

+

不同整数类型的变量和常量可以存储不同大小的数字。Int8类型的常量或者变量可以存储的数字范围是-128~127UInt8类型的常量或者变量能存储的数字范围是0~255。如果数字超出了常量或者变量可存储的范围,编译的时候会报错:

+
let cannotBeNegative: UInt8 = -1
+// UInt8 类型不能存储负数,所以会报错
+let tooBig: Int8 = Int8.max + 1
+// Int8 类型不能存储超过最大值的数,所以会报错
+

因为每一个整数类型都可以存储不同范围的值,你必须根据情况来选择不同的转换方法。不同的转换方法可以暴露出隐藏的转换错误并让你的代码更加清晰。

+

要将一种数字类型转换成另一种,你要用当前值来初始化一个新数字,这个数字的类型就是你的目标类型。在下面的例子中,常量twoThousand类型是UInt16,然而常量one类型是Uint8。它们不能直接相加,因为它们类型不同。所以要调用UInt16(one)来创建一个新的UInt16数字并用one的值来初始化,然后使用这个新数字来计算:

+
let twoThousand: UInt16 = 2_000
+let one: UInt8 = 1
+let twoThousandAndOne = twoThousand + UInt16(one)
+

现在两个数字的类型都是UInt16,可以进行相加。目标常量twoThousandAndOne的类型被推测为UInt16,因为它是两个UInt16值的合。

+

SomeType(ofInitialValue)是调用 Swift 构造器并传入一个初始值的默认方法。在语言内部,UInt16有一个构造器,可以接受一个UInt8类型的值,所以这个构造器可以用现有的UInt8来创建一个新的UInt16。注意,你并不能传入任意类型的值,只能传入UInt16内部有对应构造器的值。不过你可以扩展现有的类型来让它可以接收其他类型的值(包括自定义类型),详情参见扩展(链接待添加).

+

整数和浮点数转换

+

整数和浮点数的转换必须显式指定类型:

+
let three = 3
+let pointOneFourOneFiveNine = 0.14159
+let pi = Double(three) + pointOneFourOneFiveNine
+// pi 等于 3.14159,所以被推测为 Double 类型
+

这个例子中,常量three的值被用来创建一个Double类型的值,所以加号两边的数类型相同。如果不进行转换,两者无法相加。

+

浮点数转换为整数也一样,整数类型可以用Double或者Float类型来初始化:

+
let integerPi = Int(pi)
+// integerPi 等于 3,所以被推测为 Int 类型
+

当用这种方式来初始化一个新的整数值时,浮点值会被截断。也就是说4.75会变成4-3.9会变成3

+
+

注意:结合数字类常量和变量不同于结合数字类原始值。原始值3可以直接和原始值0.14159相加,因为数字原始值本身没有明确的类型。它们的类型只在编译器需要求值的时候被推测。

+
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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"。 diff --git a/chapter2/04_Collection_Types.html b/chapter2/04_Collection_Types.html index bce0a0ae..b624e02c 100644 --- a/chapter2/04_Collection_Types.html +++ b/chapter2/04_Collection_Types.html @@ -46,7 +46,7 @@ -

+
diff --git a/chapter2/05_Control_Flow.html b/chapter2/05_Control_Flow.html index 6c4260df..05f56ece 100644 --- a/chapter2/05_Control_Flow.html +++ b/chapter2/05_Control_Flow.html @@ -46,7 +46,7 @@ -
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diff --git a/chapter2/06_Functions.html b/chapter2/06_Functions.html index 3d0db816..35c9c4e3 100644 --- a/chapter2/06_Functions.html +++ b/chapter2/06_Functions.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”。

diff --git a/chapter2/07_Closures.html b/chapter2/07_Closures.html index bf0dd998..5a6194b8 100644 --- a/chapter2/07_Closures.html +++ b/chapter2/07_Closures.html @@ -46,7 +46,7 @@ -
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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。 diff --git a/chapter2/08_Enumerations.html b/chapter2/08_Enumerations.html index e46500f5..851e789e 100644 --- a/chapter2/08_Enumerations.html +++ b/chapter2/08_Enumerations.html @@ -46,7 +46,7 @@ -

+
diff --git a/chapter2/09_Classes_and_Structures.html b/chapter2/09_Classes_and_Structures.html index 30217e63..1a634e8e 100644 --- a/chapter2/09_Classes_and_Structures.html +++ b/chapter2/09_Classes_and_Structures.html @@ -46,7 +46,7 @@ -
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类和结构体

diff --git a/chapter2/10_Properties.html b/chapter2/10_Properties.html index 3cb67733..1dcc0675 100644 --- a/chapter2/10_Properties.html +++ b/chapter2/10_Properties.html @@ -46,7 +46,7 @@ -
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diff --git a/chapter2/12_Subscripts.html b/chapter2/12_Subscripts.html index 8fa3f1c6..20b9940b 100644 --- a/chapter2/12_Subscripts.html +++ b/chapter2/12_Subscripts.html @@ -46,7 +46,7 @@ -
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diff --git a/chapter2/13_Inheritance.html b/chapter2/13_Inheritance.html index 8ea8ad6d..1dce4fd8 100644 --- a/chapter2/13_Inheritance.html +++ b/chapter2/13_Inheritance.html @@ -46,7 +46,7 @@ -
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diff --git a/chapter2/14_Initialization.html b/chapter2/14_Initialization.html index 28de1527..1e769c84 100644 --- a/chapter2/14_Initialization.html +++ b/chapter2/14_Initialization.html @@ -46,7 +46,7 @@ -
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diff --git a/chapter2/15_Deinitialization.html b/chapter2/15_Deinitialization.html index 481aaf7c..2739714b 100644 --- a/chapter2/15_Deinitialization.html +++ b/chapter2/15_Deinitialization.html @@ -46,7 +46,7 @@ -
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diff --git a/chapter2/16_Automatic_Reference_Counting.html b/chapter2/16_Automatic_Reference_Counting.html index 4d446f1c..7203da4b 100644 --- a/chapter2/16_Automatic_Reference_Counting.html +++ b/chapter2/16_Automatic_Reference_Counting.html @@ -46,7 +46,7 @@ -
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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。

diff --git a/chapter2/17_Optional_Chaining.html b/chapter2/17_Optional_Chaining.html index 44b87a32..95c91b4e 100644 --- a/chapter2/17_Optional_Chaining.html +++ b/chapter2/17_Optional_Chaining.html @@ -46,7 +46,7 @@ -
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diff --git a/chapter2/18_Type_Casting.html b/chapter2/18_Type_Casting.html index eaf4c2e2..40037d1d 100644 --- a/chapter2/18_Type_Casting.html +++ b/chapter2/18_Type_Casting.html @@ -46,7 +46,7 @@ -
+
diff --git a/chapter2/19_Nested_Types.html b/chapter2/19_Nested_Types.html index 72a43abd..5f74d87e 100644 --- a/chapter2/19_Nested_Types.html +++ b/chapter2/19_Nested_Types.html @@ -46,7 +46,7 @@ -
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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。

diff --git a/chapter2/20_Extensions.html b/chapter2/20_Extensions.html index 96cbae78..8c92d9af 100644 --- a/chapter2/20_Extensions.html +++ b/chapter2/20_Extensions.html @@ -46,7 +46,7 @@ -
+
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+
diff --git a/chapter2/22_Generics.html b/chapter2/22_Generics.html index ce2cc130..8bea6ac5 100644 --- a/chapter2/22_Generics.html +++ b/chapter2/22_Generics.html @@ -46,7 +46,7 @@ -
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diff --git a/chapter2/23_Advanced_Operators.html b/chapter2/23_Advanced_Operators.html index cb9d95c2..c7f3a4af 100644 --- a/chapter2/23_Advanced_Operators.html +++ b/chapter2/23_Advanced_Operators.html @@ -46,7 +46,7 @@ -
+
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+
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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 index a3781c24..a2638685 100644 --- a/chapter3/01_About_the_Language_Reference.html +++ b/chapter3/01_About_the_Language_Reference.html @@ -46,7 +46,7 @@ -
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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 index fd45b056..86733718 100644 --- a/chapter3/02_Lexical_Structure.html +++ b/chapter3/02_Lexical_Structure.html @@ -46,7 +46,7 @@ -
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diff --git a/chapter3/04_Expressions.html b/chapter3/04_Expressions.html index ba7bdf53..19ec76b4 100644 --- a/chapter3/04_Expressions.html +++ b/chapter3/04_Expressions.html @@ -46,7 +46,7 @@ -
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diff --git a/chapter3/05_Declarations.html b/chapter3/05_Declarations.html index 2710f84b..ad314c81 100644 --- a/chapter3/05_Declarations.html +++ b/chapter3/05_Declarations.html @@ -46,7 +46,7 @@ -
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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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\ No newline at end of file diff --git a/source/chapter2/01_The_Basics.md b/source/chapter2/01_The_Basics.md index 781e4a18..3eff63f3 100644 --- a/source/chapter2/01_The_Basics.md +++ b/source/chapter2/01_The_Basics.md @@ -80,14 +80,14 @@ Swift 是一个类型安全的语言,可选就是一个很好的例子。Swift 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`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: @@ -101,7 +101,7 @@ Swift用字符串插值(string interpolation)的方式把常量名或者变 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。 ### 注释 @@ -115,9 +115,9 @@ Swift 中的注释与C 语言的注释非常相似。单行注释以双正斜杠 /* this is also a comment, but written over multiple lines */ - + 与C 语言多行注释不同的是,Swift 的多行注释可以嵌套在其它的多行注释之中。你可以先生成一个多行注释块,然后在这个注释块之中再嵌套成第二个多行注释。终止注释时先插入第二个注释块的终止标记,然后再插入第一个注释块的终止标记: - + /* this is the start of the first multiline comment /* this is the second, nested multiline comment */ this is the end of the first multiline comment */ @@ -129,3 +129,162 @@ Swift 中的注释与C 语言的注释非常相似。单行注释以双正斜杠 let cat = "🐱"; println(cat) // prints "🐱" + + +## 整数 + +整数就是没有小数部分的数字,比如`42`和`-23`。整数可以是有符号(正、负、零)或者无符号(正、零)。 + +Swift 提供了8、16、32和64位的有符号和无符号整数类型。这些整数类型和 C 语言的命名方式很像,比如8位无符号整数类型是`UInt8`,32位有符号整数类型是`Int32`。就像 Swift 的其他类型一样,整数类型采用大写命名法。 + +### 整数范围 + +你可以访问不同整数类型的`min`和`max`属性来获取对应类型的最大值和最小值: + + let minValue = UInt8.min // minValue 为 0,是 UInt8 类型的最小值 + let maxValue = UInt8.max // maxValue 为 255,是 UInt8 类型的最大值 + +### Int + +一般来说,你不需要专门指定整数的长度。Swift 提供了一个特殊的整数类型`Int`,长度与当前平台的原生字长相同: + +* 在32位平台上,`Int`和`Int32`长度相同。 +* 在64位平台上,`Int`和`Int64`长度相同。 + +除非你需要特定长度的整数,一般来说使用`Int`就够了。这可以提高代码一致性和可复用性。即使是在32位平台上,`Int`可以存储的整数范围也可以达到`-2147483648`~`2147483647`,大多数时候这已经足够大了。 + +### UInt + +Swift 也提供了一个特殊的无符号类型`UInt`,长度与当前平台的原生字长相同: + +* 在32位平台上,`UInt`和`UInt32`长度相同。 +* 在64位平台上,`UInt`和`UInt64`长度相同。 + +> 注意:尽量不要使用`UInt`,除非你真的需要存储一个和当前平台原生字长相同的无符号整数。除了这种情况,最好使用`Int`,即使你要存储的值已知是非负的。统一使用`Int`可以提高代码的可复用性,避免不同类型数字之间的转换,并且匹配数字的类型推测,详情参见[类型安全和类型推测](## 类型安全和类型推测)。 + +## 浮点数 + +浮点数是有小数部分的数字,比如`3.14159`,`0.1`和`-273.15`。 + +浮点类型比整数类型表示的范围更大,可以存储比`Int`类型更大或者更小的数字。Swift 提供了两种有符号浮点数类型: + +* `Double`表示64位浮点数。当你需要存储很大或者很高精度的浮点数时请使用此类型。 +* `Float`表示32位浮点数。精度要求不高的话可以使用此类型。 + +> 注意:`Double`精确度很高,至少有15位数字,而`Float`最少只有6位数字。选择哪个类型取决于你的代码需要处理的数字大小。 + +## 类型安全和类型推测 + +Swift 是一个类型安全的语言。类型安全的语言可以让你清楚地知道代码要处理的值的类型。如果你的代码需要一个`String`,你绝对不可能不小心传进去一个`Int`。 + +Swift 是类型安全的,会在编译你的代码时进行类型检查,如果遇到不匹配的类型会报错。这可以让你在开发的时候尽早发现并修复错误。 + +当你要处理不同类型的值时,类型检查可以帮你避免错误。然而,这并不是说你每次声明常量和变量的时候都需要显式指定类型。如果你没有显式指定类型,Swift 会使用类型推测来选择合适的类型。有了类型推测,编译器可以在编译代码的时候自动推测出表达式的类型。原理很简单,判断你赋的值即可。 + +因为有类型推测,和 C 或者 Objc 比起来 Swift 很少需要声明类型。常量和变量虽然需要明确类型,但是大部分工作并不需要你自己来完成。 + +当你声明常量或者变量并赋初值的时候类型推测非常有用。当你在声明常量或者变量的时候赋给它们一个原始值即可触发类型推测。(原始值就是会直接出现在你代码中的值,比如`42`和`3.14159`。) + +举个例子,如果你给一个新常量赋值`42`并且没有标明类型,Swift 可以推测出常量类型是`Int`,因为你给它赋的初值看起来很像一个整数: + + let meaningOfLife = 42 + // meaningOfLife 会被推测为 Int 类型 + +同理,如果你没有给浮点原始值标明类型,Swift 会推测你想要的是`Double`: + + let pi = 3.14159 + // pi 会被推测为 Double 类型 + +当推测浮点数的类型时,Swift 总是会选择`Double`而不是`Float`。 + +如果表达式中同时出现了整数和浮点数,会被推测为`Double`类型: + + let anotherPi = 3 + 0.14159 + // anotherPi 会被推测为 Double 类型 + +原始值`3`没有显式声明类型,而表达式中出现了一个浮点原始值,所以表达式会被推测为`Double`类型。 + +## 数值类原始值 + +整数原始值可以被写作: + +* 一个十进制数,没有前缀 +* 一个二进制数,前缀是`0b` +* 一个八进制数,前缀是`0o` +* 一个十六进制数,前缀是`0x` + +下面的所有整数原始值的十进制值都是`17`: + + let decimalInteger = 17 + let binaryInteger = 0b10001 // 二进制的17 + let octalInteger = 0o21 // 八进制的17 + let hexadecimalInteger = 0x11 // 十六机制的17 + +浮点原始值可以是十进制(没有前缀)或者是十六进制(前缀是`0x`)。小数点两边必须有至少一个十进制数字(或者是十六进制的数字)。浮点原始值还有一个可选的指数,在十进制浮点数中通过大写或者小写的`e`来指定,在十六进制浮点数中通过大写或者小写的`p`来指定。 + +如果一个十进制数的指数为`exp`,那这个数相当于基数和10^exp的乘积: +* 1.25e2 表示 1.25 × 10^2,等于 125.0。 +* 1.25e-2 表示 1.25 × 10^-2,等于 0.0125。 + +如果一个十六进制数的指数为`exp`,那这个数相当于基数和2^exp的乘积: +* 0xFp2 表示 15 × 2^2,等于 60.0。 +* 0xFp-2 表示 15 × 2^-2,等于 3.75。 + +下面的这些浮点原始值都等于十进制的`12.1875`: + + let decimalDouble = 12.1875 + let exponentDouble = 1.21875e1 + let hexadecimalDouble = 0xC.3p0 + +数值类原始值可以包括额外的格式来增强可读性。整数和浮点数都可以添加额外的零并且包含下划线,并不会影响原始值: + + let paddedDouble = 000123.456 + let oneMillion = 1_000_000 + let justOverOneMillion = 1_000_000.000_000_1 + +## 数值类型转换 + +通常来讲,即使代码中的整数常量和变量已知非负,也请使用`Int`类型。总是使用默认的整数类型可以保证你的整数常量和变量可以直接被复用并且可以匹配整数类原始值的类型推测。 +只有在必要的时候才使用其他整数类型,比如要处理外部的长度明确的数据或者为了优化性能、内存占用等等。使用显式指定长度的类型可以及时发现值溢出并且可以暗示正在处理特殊数据。 + +### 整数转换 + +不同整数类型的变量和常量可以存储不同大小的数字。`Int8`类型的常量或者变量可以存储的数字范围是`-128`~`127`,`UInt8`类型的常量或者变量能存储的数字范围是`0`~`255`。如果数字超出了常量或者变量可存储的范围,编译的时候会报错: + + let cannotBeNegative: UInt8 = -1 + // UInt8 类型不能存储负数,所以会报错 + let tooBig: Int8 = Int8.max + 1 + // Int8 类型不能存储超过最大值的数,所以会报错 + +因为每一个整数类型都可以存储不同范围的值,你必须根据情况来选择不同的转换方法。不同的转换方法可以暴露出隐藏的转换错误并让你的代码更加清晰。 + +要将一种数字类型转换成另一种,你要用当前值来初始化一个新数字,这个数字的类型就是你的目标类型。在下面的例子中,常量`twoThousand`类型是`UInt16`,然而常量`one`类型是`Uint8`。它们不能直接相加,因为它们类型不同。所以要调用`UInt16(one)`来创建一个新的`UInt16`数字并用`one`的值来初始化,然后使用这个新数字来计算: + + let twoThousand: UInt16 = 2_000 + let one: UInt8 = 1 + let twoThousandAndOne = twoThousand + UInt16(one) + +现在两个数字的类型都是`UInt16`,可以进行相加。目标常量`twoThousandAndOne`的类型被推测为`UInt16`,因为它是两个`UInt16`值的合。 + +`SomeType(ofInitialValue)`是调用 Swift 构造器并传入一个初始值的默认方法。在语言内部,`UInt16`有一个构造器,可以接受一个`UInt8`类型的值,所以这个构造器可以用现有的`UInt8`来创建一个新的`UInt16`。注意,你并不能传入任意类型的值,只能传入`UInt16`内部有对应构造器的值。不过你可以扩展现有的类型来让它可以接收其他类型的值(包括自定义类型),详情参见`扩展(链接待添加)`. + +### 整数和浮点数转换 + +整数和浮点数的转换必须显式指定类型: + + let three = 3 + let pointOneFourOneFiveNine = 0.14159 + let pi = Double(three) + pointOneFourOneFiveNine + // pi 等于 3.14159,所以被推测为 Double 类型 + +这个例子中,常量`three`的值被用来创建一个`Double`类型的值,所以加号两边的数类型相同。如果不进行转换,两者无法相加。 + +浮点数转换为整数也一样,整数类型可以用`Double`或者`Float`类型来初始化: + + let integerPi = Int(pi) + // integerPi 等于 3,所以被推测为 Int 类型 + +当用这种方式来初始化一个新的整数值时,浮点值会被截断。也就是说`4.75`会变成`4`,`-3.9`会变成`3`。 + +> 注意:结合数字类常量和变量不同于结合数字类原始值。原始值`3`可以直接和原始值`0.14159`相加,因为数字原始值本身没有明确的类型。它们的类型只在编译器需要求值的时候被推测。 +