From 434408be0678b59d9ba51f0eb7eb26b4e2306340 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Thu, 5 Jun 2014 18:16:39 +0800 Subject: [PATCH 01/36] =?UTF-8?q?=E5=BC=80=E5=A7=8B=E2=80=9C=E9=9B=86?= =?UTF-8?q?=E5=90=88=E7=B1=BB=E5=9E=8B=E2=80=9D=E7=AB=A0=E8=8A=82=E7=BF=BB?= =?UTF-8?q?=E8=AF=91?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/04_Collection_Types.md | 1 + 1 file changed, 1 insertion(+) diff --git a/source/chapter2/04_Collection_Types.md b/source/chapter2/04_Collection_Types.md index e69de29b..c25bf7b0 100644 --- a/source/chapter2/04_Collection_Types.md +++ b/source/chapter2/04_Collection_Types.md @@ -0,0 +1 @@ +# 集合类型 (Collection Types) \ No newline at end of file From ba5e67fc3b06a8c7c26baa56dd31441048da2d70 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Thu, 5 Jun 2014 18:16:39 +0800 Subject: [PATCH 02/36] =?UTF-8?q?=E5=BC=80=E5=A7=8B=E2=80=9C=E9=9B=86?= =?UTF-8?q?=E5=90=88=E7=B1=BB=E5=9E=8B=E2=80=9D=E7=AB=A0=E8=8A=82=E7=BF=BB?= =?UTF-8?q?=E8=AF=91?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/04_Collection_Types.md | 1 + 1 file changed, 1 insertion(+) diff --git a/source/chapter2/04_Collection_Types.md b/source/chapter2/04_Collection_Types.md index e69de29b..c25bf7b0 100644 --- a/source/chapter2/04_Collection_Types.md +++ b/source/chapter2/04_Collection_Types.md @@ -0,0 +1 @@ +# 集合类型 (Collection Types) \ No newline at end of file From 252db257705104dd183f850f57826675db861668 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Thu, 5 Jun 2014 23:38:16 +0800 Subject: [PATCH 03/36] =?UTF-8?q?=E6=8E=A7=E5=88=B6=E6=B5=81=E5=9C=B0?= =?UTF-8?q?=E4=B8=80=E6=AE=B5?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/05_Control_Flow.md | 3 +++ 1 file changed, 3 insertions(+) diff --git a/source/chapter2/05_Control_Flow.md b/source/chapter2/05_Control_Flow.md index e69de29b..5ad51630 100644 --- a/source/chapter2/05_Control_Flow.md +++ b/source/chapter2/05_Control_Flow.md @@ -0,0 +1,3 @@ +# 控制流 + +Swift提供了类似C语言的流程控制结构，包括将任务执行多次的`for`和`while`循环，基于特定条件选择执行不同分支的`if`和`switch`语句，还有控制流程跳转到其他代码的`break`和`continue`语句。 \ No newline at end of file From 802bb0f77117172177e6f0de58d03c36a2e62965 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=A2=81=E6=9D=B0?= Date: Thu, 5 Jun 2014 23:29:10 +0800 Subject: [PATCH 04/36] Update README.md --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index 30dc62c8..bcfba57b 100644 --- a/README.md +++ b/README.md @@ -22,7 +22,7 @@ * 基本操作符(@xielingwang 认领) * 字符串和字符(完成) * 集合类型(@WilliamZang 认领) - * 控制流 + * 控制流(vclwei) * 函数(翻译中) * 闭包(@wh1100717 认领) * 枚举 From 351aca566140ea62b775ea99ddbebef42921a4b3 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=A2=81=E6=9D=B0?= Date: Thu, 5 Jun 2014 23:31:16 +0800 Subject: [PATCH 05/36] Update README.md --- README.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/README.md b/README.md index bcfba57b..2b15f6ec 100644 --- a/README.md +++ b/README.md @@ -22,11 +22,11 @@ * 基本操作符(@xielingwang 认领) * 字符串和字符(完成) * 集合类型(@WilliamZang 认领) - * 控制流(vclwei) + * 控制流(@vclwei 认领) * 函数(翻译中) * 闭包(@wh1100717 认领) * 枚举 - * 类和结构体 + * 类和结构体(@JaySurplus 认领) * 属性 * 方法 * 下标 From 5cbc82fa3e4a8b58fb83ac764c4c3af85a134b8f Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Fri, 6 Jun 2014 10:39:07 +0800 Subject: [PATCH 06/36] =?UTF-8?q?=E2=80=9C=E5=B1=9E=E6=80=A7=E2=80=9D?= =?UTF-8?q?=E7=AC=AC=E4=B8=80=E6=AE=B5?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 3 +++ 1 file changed, 3 insertions(+) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index e69de29b..a12beec8 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -0,0 +1,3 @@ +# 属性 (Properties) + +**属性**将值跟特定的类、结构或枚举关联。一种是存储属性，把常量和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。 \ No newline at end of file From cdacfa1a4c0c5de5b403268b93794cafd72ac5cd Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Fri, 6 Jun 2014 10:43:30 +0800 Subject: [PATCH 07/36] =?UTF-8?q?=E2=80=9C=E5=B1=9E=E6=80=A7=E2=80=9D?= =?UTF-8?q?=E7=AC=AC=E4=BA=8C=E6=AE=B5?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index a12beec8..ea52defb 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -1,3 +1,5 @@ # 属性 (Properties) -**属性**将值跟特定的类、结构或枚举关联。一种是存储属性，把常量和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。 \ No newline at end of file +**属性**将值跟特定的类、结构或枚举关联。一种是存储属性，把常量和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。 \ No newline at end of file From 39059177a0d6cc71dab1e11ac3d282dd7fce7fea Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=A2=81=E6=9D=B0?= Date: Fri, 6 Jun 2014 06:36:17 +0800 Subject: [PATCH 08/36] Update README.md --- README.md | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/README.md b/README.md index 2b15f6ec..c36f3bc5 100644 --- a/README.md +++ b/README.md @@ -23,17 +23,17 @@ * 字符串和字符(完成) * 集合类型(@WilliamZang 认领) * 控制流(@vclwei 认领) - * 函数(翻译中) + * 函数(@honghaoz 认领) * 闭包(@wh1100717 认领) * 枚举 * 类和结构体(@JaySurplus 认领) - * 属性 + * 属性(@shinyzhu 认领) * 方法 * 下标 * 继承 - * 构造函数 - * 析构函数(认领) - * 自动引用计数 + * 构造过程(@lifedim 认领) + * 析构过程(认领) + * 自动引用计数(@TimothyYe 认领) * 可选链(认领) * 类型检查 * 嵌套类型(完成) From 245e16f2f9c22d961f174f3abd0d210c6313b4af Mon Sep 17 00:00:00 2001 From: numbbbbb Date: Fri, 6 Jun 2014 06:41:31 +0800 Subject: [PATCH 09/36] change the translation of initialization and deinitialization --- chapter1/01_swift.html | 10 +++++----- chapter1/02_a_swift_tour.html | 10 +++++----- chapter1/chapter1.html | 10 +++++----- chapter2/01_The_Basics.html | 12 ++++++------ chapter2/02_Basic_Operators.html | 10 +++++----- chapter2/03_Strings_and_Characters.html | 12 ++++++------ chapter2/04_Collection_Types.html | 10 +++++----- chapter2/05_Control_Flow.html | 10 +++++----- chapter2/06_Functions.html | 12 ++++++------ chapter2/07_Closures.html | 10 +++++----- chapter2/08_Enumerations.html | 10 +++++----- chapter2/09_Classes_and_Structures.html | 12 ++++++------ chapter2/10_Properties.html | 10 +++++----- chapter2/11_Methods.html | 10 +++++----- chapter2/12_Subscripts.html | 10 +++++----- chapter2/13_Inheritance.html | 12 ++++++------ chapter2/14_Initialization.html | 16 ++++++++-------- chapter2/15_Deinitialization.html | 16 ++++++++-------- chapter2/16_Automatic_Reference_Counting.html | 14 +++++++------- chapter2/17_Optional_Chaining.html | 10 +++++----- chapter2/18_Type_Casting.html | 10 +++++----- chapter2/19_Nested_Types.html | 12 ++++++------ chapter2/20_Extensions.html | 10 +++++----- chapter2/21_Protocols.html | 10 +++++----- chapter2/22_Generics.html | 10 +++++----- chapter2/23_Advanced_Operators.html | 10 +++++----- chapter2/chapter2.html | 12 ++++++------ chapter3/01_About_the_Language_Reference.html | 12 ++++++------ chapter3/02_Lexical_Structure.html | 10 +++++----- chapter3/03_Types.html | 10 +++++----- chapter3/04_Expressions.html | 10 +++++----- chapter3/05_Declarations.html | 10 +++++----- chapter3/06_Attributes.html | 10 +++++----- chapter3/07_Patterns.html | 10 +++++----- .../08_Generic_Parameters_and_Arguments.html | 10 +++++----- chapter3/09_Summary_of_the_Grammar.html | 10 +++++----- chapter3/chapter3.html | 10 +++++----- index.html | 10 +++++----- manifest.appcache | 4 ++-- search_index.json | 2 +- 40 files changed, 209 insertions(+), 209 deletions(-) diff --git a/chapter1/01_swift.html b/chapter1/01_swift.html index 3bcbfd24..4e9be1be 100644 --- a/chapter1/01_swift.html +++ b/chapter1/01_swift.html @@ -46,7 +46,7 @@ -
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    -
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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。

    diff --git a/chapter2/02_Basic_Operators.html b/chapter2/02_Basic_Operators.html index b25c9f0e..419437ef 100644 --- a/chapter2/02_Basic_Operators.html +++ b/chapter2/02_Basic_Operators.html @@ -46,7 +46,7 @@ -
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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"。Swift 字符串通过 String 类型来表示，也可以表示为 Character 类型值的集合。

    diff --git a/chapter2/04_Collection_Types.html b/chapter2/04_Collection_Types.html index e1767d07..e1785b7e 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”。

    diff --git a/chapter2/07_Closures.html b/chapter2/07_Closures.html index 164fc9d7..ed6e5e10 100644 --- a/chapter2/07_Closures.html +++ b/chapter2/07_Closures.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 a41da6d8..06a1c661 100644 --- a/chapter2/10_Properties.html +++ b/chapter2/10_Properties.html @@ -46,7 +46,7 @@ -
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    • diff --git a/chapter2/14_Initialization.html b/chapter2/14_Initialization.html index 096ae25a..eea7df91 100644 --- a/chapter2/14_Initialization.html +++ b/chapter2/14_Initialization.html @@ -5,7 +5,7 @@ - 构造函数 | Swift 编程语言 + 构造过程 | Swift 编程语言 @@ -21,7 +21,7 @@ - + @@ -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。

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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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    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。

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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。

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\ No newline at end of file From 86834185b7b3476b261f4e3f676b5f00e127932b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=A2=81=E6=9D=B0?= Date: Fri, 6 Jun 2014 10:30:33 +0800 Subject: [PATCH 10/36] Update README.md --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index c36f3bc5..4f514e61 100644 --- a/README.md +++ b/README.md @@ -29,7 +29,7 @@ * 类和结构体(@JaySurplus 认领) * 属性(@shinyzhu 认领) * 方法 - * 下标 + * 下标(@siemenliu 认领) * 继承 * 构造过程(@lifedim 认领) * 析构过程(认领) From 3437a85f7ebd265e104fde0bfd98b3fa5a7e197f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=A2=81=E6=9D=B0?= Date: Fri, 6 Jun 2014 10:37:16 +0800 Subject: [PATCH 11/36] Update README.md --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index 4f514e61..7af98895 100644 --- a/README.md +++ b/README.md @@ -12,7 +12,7 @@ # 翻译进度 -> 说明：翻译中表示只完成了一部分，你可以接着翻译剩下的部分。认领表示有人认领了整章，如果你要进行认领的话请先pr并说明章节，谢谢。 +> 说明：翻译之前请先到PR列表中查看别人认领的内容，尽量不要重复，谢谢！ * 欢迎使用 Swift * 关于 Swift(完成) From 712b57fe004136f76126389c85147dea30c25a9c Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Fri, 6 Jun 2014 18:00:08 +0800 Subject: [PATCH 12/36] =?UTF-8?q?=E5=AD=98=E5=82=A8=E5=B1=9E=E6=80=A7?= =?UTF-8?q?=E4=B8=80=E8=8A=82=E5=AE=8C=E6=88=90=E3=80=82=E5=BE=85=E4=BF=AE?= =?UTF-8?q?=E8=AE=A2=E3=80=82?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 40 ++++++++++++++++++++++++++++++-- 1 file changed, 38 insertions(+), 2 deletions(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index ea52defb..de27ddea 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -1,5 +1,41 @@ # 属性 (Properties) -**属性**将值跟特定的类、结构或枚举关联。一种是存储属性，把常量和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。 +**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。 \ No newline at end of file +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，还可以定义属性观察者来监控属性值的变化，以此来触发一个自定义的操作。属性观察者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。 + +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 + let length: Int +} +var rangeOfThreeItems = FixedLengthRange(firstValue: 0, length: 3) +// the range represents integer values 0, 1, and 2 +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，所以再无法修改它的值。 + +## 常量化结构体实例中的存储属性 + +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) +// this range represents integer values 0, 1, 2, and 3 +rangeOfFourItems.firstValue = 6 +// this will report an error, even thought firstValue is a variable property” + +``` From 41c8fb26d41fff11a3752d41a6043427d45af24b Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Thu, 5 Jun 2014 18:16:39 +0800 Subject: [PATCH 13/36] =?UTF-8?q?=E5=BC=80=E5=A7=8B=E2=80=9C=E9=9B=86?= =?UTF-8?q?=E5=90=88=E7=B1=BB=E5=9E=8B=E2=80=9D=E7=AB=A0=E8=8A=82=E7=BF=BB?= =?UTF-8?q?=E8=AF=91?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/04_Collection_Types.md | 1 + 1 file changed, 1 insertion(+) diff --git a/source/chapter2/04_Collection_Types.md b/source/chapter2/04_Collection_Types.md index e69de29b..c25bf7b0 100644 --- a/source/chapter2/04_Collection_Types.md +++ b/source/chapter2/04_Collection_Types.md @@ -0,0 +1 @@ +# 集合类型 (Collection Types) \ No newline at end of file From 3b9c03d81d0e9bc0031df16f294f9bd500eb448e Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Thu, 5 Jun 2014 23:38:16 +0800 Subject: [PATCH 14/36] =?UTF-8?q?=E6=8E=A7=E5=88=B6=E6=B5=81=E5=9C=B0?= =?UTF-8?q?=E4=B8=80=E6=AE=B5?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/05_Control_Flow.md | 3 +++ 1 file changed, 3 insertions(+) diff --git a/source/chapter2/05_Control_Flow.md b/source/chapter2/05_Control_Flow.md index e69de29b..5ad51630 100644 --- a/source/chapter2/05_Control_Flow.md +++ b/source/chapter2/05_Control_Flow.md @@ -0,0 +1,3 @@ +# 控制流 + +Swift提供了类似C语言的流程控制结构，包括将任务执行多次的`for`和`while`循环，基于特定条件选择执行不同分支的`if`和`switch`语句，还有控制流程跳转到其他代码的`break`和`continue`语句。 \ No newline at end of file From f2d7d03643a56a5eb7e9bf236ec3d235840c6718 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Fri, 6 Jun 2014 10:39:07 +0800 Subject: [PATCH 15/36] =?UTF-8?q?=E2=80=9C=E5=B1=9E=E6=80=A7=E2=80=9D?= =?UTF-8?q?=E7=AC=AC=E4=B8=80=E6=AE=B5?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 3 +++ 1 file changed, 3 insertions(+) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index e69de29b..a12beec8 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -0,0 +1,3 @@ +# 属性 (Properties) + +**属性**将值跟特定的类、结构或枚举关联。一种是存储属性，把常量和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。 \ No newline at end of file From 1a18d61f9ca6ddbbb370977cd1dac0f569766d6d Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Fri, 6 Jun 2014 10:43:30 +0800 Subject: [PATCH 16/36] =?UTF-8?q?=E2=80=9C=E5=B1=9E=E6=80=A7=E2=80=9D?= =?UTF-8?q?=E7=AC=AC=E4=BA=8C=E6=AE=B5?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index a12beec8..ea52defb 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -1,3 +1,5 @@ # 属性 (Properties) -**属性**将值跟特定的类、结构或枚举关联。一种是存储属性，把常量和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。 \ No newline at end of file +**属性**将值跟特定的类、结构或枚举关联。一种是存储属性，把常量和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。 \ No newline at end of file From 1a6ea959d691f51a9e90227add0e428683596f95 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sat, 7 Jun 2014 06:47:16 +0800 Subject: [PATCH 17/36] =?UTF-8?q?=E5=AE=8C=E6=88=90=E2=80=9C=E5=AD=98?= =?UTF-8?q?=E5=82=A8=E5=B1=9E=E6=80=A7=E2=80=9D=E4=B8=AD=E7=9A=84=E4=B8=A4?= =?UTF-8?q?=E8=8A=82=EF=BC=8C=E5=BE=85=E4=BF=AE=E8=AE=A2=E3=80=82?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 48 ++++++++++++++++++++++++++++++-- 1 file changed, 46 insertions(+), 2 deletions(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index ea52defb..0decc4b6 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -1,5 +1,49 @@ # 属性 (Properties) -**属性**将值跟特定的类、结构或枚举关联。一种是存储属性，把常量和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。 +**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。 \ No newline at end of file +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，还可以定义属性观察者来监控属性值的变化，以此来触发一个自定义的操作。属性观察者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。 + +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 + let length: Int +} +var rangeOfThreeItems = FixedLengthRange(firstValue: 0, length: 3) +// the range represents integer values 0, 1, and 2 +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，所以再无法修改它的值。 + +### 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) +// this range represents integer values 0, 1, 2, and 3 +rangeOfFourItems.firstValue = 6 +// this will report an error, even thought firstValue is a variable property” + +``` + +因为`rangeOfFourItems`声明成了常量（用`let`关键字），即使`firstValue`是一个变量属性，也无法再修改属性它的值。 + +这种行为是由于结构体（struct）属于*值类型*。当值类型的实例被声明为常量的时候，它的所有属性也就成了常量。 + +属于*引用类型*的类（class）则不一样，把一个引用类型的实例赋给一个常量后，仍然可以修改实例的变量属性。 + +### 延迟存储属性 \ No newline at end of file From 42a19a455062e8d15058b557de7e3cddbe21af54 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sat, 7 Jun 2014 07:34:40 +0800 Subject: [PATCH 18/36] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E2=80=9C=E5=BB=B6?= =?UTF-8?q?=E8=BF=9F=E5=AD=98=E5=82=A8=E5=B1=9E=E6=80=A7=E2=80=9D=E9=83=A8?= =?UTF-8?q?=E5=88=86=E5=86=85=E5=AE=B9?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 37 +++++++++++++++++++++++++++++++- 1 file changed, 36 insertions(+), 1 deletion(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index 0decc4b6..6984249b 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -46,4 +46,39 @@ rangeOfFourItems.firstValue = 6 属于*引用类型*的类（class）则不一样，把一个引用类型的实例赋给一个常量后，仍然可以修改实例的变量属性。 -### 延迟存储属性 \ No newline at end of file +### 延迟存储属性 + +延迟存储属性是指当第一次被调用的时候才有初始值的属性。在属性声明前使用`@lazy`特性来表示一个延迟存储属性。 + +> 注意 +> +> 必须将延迟存储属性声明成变量（使用`var`关键字），因为可能在实例构造完成之前属性的值无法得到。常量属性在构造过程完成之前必须要有初始值，因此无法声明成延迟属性。 + +延迟属性很有用，当属性的值依赖于在实例的构造过程结束前无法知道具体值的外部因素时，或者当属性的值需要复杂或大量计算时，可以只在需要的时候来计算它。 + +下面复合类的例子使用了延迟存储属性来避免不必要的初始化。例子中定义了`DataImporter`和`DataManager`两个类，下面是部分代码： + +``` +class DataImporter { + /* + DataImporter is a class to import data from an external file. + The class is assumed to take a non-trivial amount of time to initialize. + */ + var fileName = "data.txt" + // the DataImporter class would provide data importing functionality here +} + +class DataManager { + @lazy var importer = DataImporter() + var data = String[]() + // the DataManager class would provide data management functionality here +} + +let manager = DataManager() +manager.data += "Some data" +manager.data += "Some more data" +// the DataImporter instance for the importer property has not yet been created + +``` + + From 4937fd27957ffaa90589e75e8e7b889ddcc51d9f Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sat, 7 Jun 2014 07:35:09 +0800 Subject: [PATCH 19/36] =?UTF-8?q?=E4=BF=AE=E6=94=B9=E4=BB=A3=E7=A0=81?= =?UTF-8?q?=E6=AE=B5=E5=86=85=E5=AE=B9=EF=BC=8C=E5=8E=BB=E6=8E=89=E4=BB=A3?= =?UTF-8?q?=E7=A0=81=E6=9C=80=E5=90=8E=E7=9A=84=E5=8F=8C=E5=BC=95=E5=8F=B7?= =?UTF-8?q?=E3=80=82?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index 6984249b..19844f79 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -22,7 +22,7 @@ struct FixedLengthRange { var rangeOfThreeItems = FixedLengthRange(firstValue: 0, length: 3) // the range represents integer values 0, 1, and 2 rangeOfThreeItems.firstValue = 6 -// the range now represents integer values 6, 7, and 8” +// the range now represents integer values 6, 7, and 8 ``` @@ -36,7 +36,7 @@ rangeOfThreeItems.firstValue = 6 let rangeOfFourItems = FixedLengthRange(firstValue: 0, length: 4) // this range represents integer values 0, 1, 2, and 3 rangeOfFourItems.firstValue = 6 -// this will report an error, even thought firstValue is a variable property” +// this will report an error, even thought firstValue is a variable property ``` From 60974fcf8a4766c9f64f69230a805df4b9e72d33 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sat, 7 Jun 2014 07:58:32 +0800 Subject: [PATCH 20/36] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E2=80=9C=E5=BB=B6?= =?UTF-8?q?=E8=BF=9F=E5=B1=9E=E6=80=A7=E2=80=9D=E4=B8=80=E8=8A=82?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index 19844f79..f89dbe90 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -81,4 +81,20 @@ manager.data += "Some more data" ``` +`DataManager`类包含一个名为`data`的存储属性，初始值是一个空的字符串（`String`）数组。虽然没有写出全部代码，`DataManager`类的目的是管理和提供对这个字符串数组的访问。 + +`DataManager`的一个功能是从文件导入数据，该功能由`DataImporter`类提供，它需要一定的时间来处理。因为它需要在实例化之后打开文件、读取文件内容到内存。 + +`DataManager`也可以不从文件中导入数据，所以当`DataManager`的实例被创建时，就没有必要创建一个`DataImporter`的实例。同时，更有意义的是当用到`DataImporter`的时候才去创建它。 + +由于使用了`@lazy`特性，`importer`属性只有在第一次被访问的时候才被创建。比如访问它的属性`fileName`时： + +``` +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 From 1a8f228e5fe12254366cc080e18d826604e34163 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sat, 7 Jun 2014 09:22:59 +0800 Subject: [PATCH 21/36] =?UTF-8?q?=E5=AE=8C=E6=88=90=E2=80=9C=E5=AD=98?= =?UTF-8?q?=E5=82=A8=E5=B1=9E=E6=80=A7=E5=92=8C=E5=AE=9E=E4=BE=8B=E5=8F=98?= =?UTF-8?q?=E9=87=8F=E2=80=9D=E4=B8=80=E8=8A=82?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index f89dbe90..d710c18e 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -98,3 +98,10 @@ println(manager.importer.fileName) ### 存储属性和实例变量 +如果您有过Objective-C经验，应该知道有2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 + From 201147d72c38a2b2d57fc4f626c2f08c3daef354 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sun, 8 Jun 2014 07:57:02 +0800 Subject: [PATCH 22/36] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E2=80=9C=E8=AE=A1?= =?UTF-8?q?=E7=AE=97=E5=B1=9E=E6=80=A7=E2=80=9D=E5=86=85=E5=AE=B9?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 33 ++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index d710c18e..5efe58c0 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -105,3 +105,36 @@ Swift编程语言中把这些理论统一用属性来实现。Swift中的属性 ## 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来间接设置值。 + +``` +struct Point { + var x = 0.0, y = 0.0 +} +struct Size { + var width = 0.0, height = 0.0 +} +struct Rect { + var origin = Point() + var size = Size() + var center: Point { + get { + let centerX = origin.x + (size.width / 2) + let centerY = origin.y + (size.height / 2) + return Point(x: centerX, y: centerY) + } + set(newCenter) { + origin.x = newCenter.x - (size.width / 2) + origin.y = newCenter.y - (size.height / 2) + } + } +} +var square = Rect(origin: Point(x: 0.0, y: 0.0), + size: Size(width: 10.0, height: 10.0)) +let initialSquareCenter = square.center +square.center = Point(x: 15.0, y: 15.0) +println("square.origin is now at (\(square.origin.x), \(square.origin.y))") +// prints "square.origin is now at (10.0, 10.0)” + +``` + From bcd38b0fc57be701a16fb32d3873e9a758cb12d1 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sun, 8 Jun 2014 08:00:33 +0800 Subject: [PATCH 23/36] =?UTF-8?q?=E5=A2=9E=E5=8A=A0"=E7=89=B9=E6=80=A7"?= =?UTF-8?q?=E7=9A=84=E5=8E=9F=E6=96=87=E6=B3=A8=E8=A7=A3=EF=BC=88Attribute?= =?UTF-8?q?=EF=BC=89?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index 5efe58c0..4545677e 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -87,7 +87,7 @@ manager.data += "Some more data" `DataManager`也可以不从文件中导入数据，所以当`DataManager`的实例被创建时，就没有必要创建一个`DataImporter`的实例。同时，更有意义的是当用到`DataImporter`的时候才去创建它。 -由于使用了`@lazy`特性，`importer`属性只有在第一次被访问的时候才被创建。比如访问它的属性`fileName`时： +由于使用了`@lazy`特性（Attribute），`importer`属性只有在第一次被访问的时候才被创建。比如访问它的属性`fileName`时： ``` println(manager.importer.fileName) From 89b82581654d90c135bbb64727e9ccb8b14486c8 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sun, 8 Jun 2014 08:57:11 +0800 Subject: [PATCH 24/36] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E8=AE=A1=E7=AE=97?= =?UTF-8?q?=E5=B1=9E=E6=80=A7=E4=BE=8B=E5=AD=90=E5=88=86=E6=9E=90?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index 4545677e..5ad83013 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -138,3 +138,18 @@ println("square.origin is now at (\(square.origin.x), \(square.origin.y))") ``` +这个例子定义了3个几何形状的结构体： + +- `Point`封装了一个`(x, y)`的坐标 +- `Size`封装了一个`width`和`height` +- `Rect`表示一个有原点和尺寸的矩形 + +`Rect`也提供了一个名为`center`的计算属性。一个矩形的中心点可以从原点和尺寸来算出，所以不需要将它以显式声明的`Point`来保存。`Rect`的计算属性`center`提供了自定义的getter和setter来获取和设置矩形的中心点，就像它有一个存储属性一样。 + +例子中接下来创建了一个名为`square`的`Rect`实例，初始值原点是`(0, 0)`，宽度高度都是`10`。如图所示蓝色正方形。 + +`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](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Art/computedProperties_2x.png) \ No newline at end of file From d3d9dd94dff5d8baf3c524e6b3793507dd413032 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sun, 8 Jun 2014 08:57:53 +0800 Subject: [PATCH 25/36] =?UTF-8?q?=E4=BF=AE=E6=94=B9setter=E7=9A=84?= =?UTF-8?q?=E6=8F=8F=E8=BF=B0?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index 5ad83013..bd3b162b 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -105,7 +105,7 @@ Swift编程语言中把这些理论统一用属性来实现。Swift中的属性 ## 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来间接设置值。 +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 { From 7503c7548a08adcead246b66f71352f3e375ff56 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sun, 8 Jun 2014 09:03:20 +0800 Subject: [PATCH 26/36] =?UTF-8?q?=E5=9B=BE=E7=89=87=E7=9B=B4=E6=8E=A5?= =?UTF-8?q?=E4=BD=BF=E7=94=A8HTML=E4=BB=A3=E7=A0=81=EF=BC=8C=E4=BB=A5?= =?UTF-8?q?=E4=BF=AE=E6=94=B9=E6=98=BE=E7=A4=BA=E5=A4=A7=E5=B0=8F?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index bd3b162b..6b3f00e4 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -152,4 +152,8 @@ println("square.origin is now at (\(square.origin.x), \(square.origin.y))") `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](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Art/computedProperties_2x.png) \ No newline at end of file +Computed Properties sample + + +### Setter的便捷方式 + From 706f040fd6facc85e9be476f19c72685afc36d6d Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sun, 8 Jun 2014 09:08:33 +0800 Subject: [PATCH 27/36] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E2=80=9C=E4=BE=BF?= =?UTF-8?q?=E6=8D=B7Setter=E5=A3=B0=E6=98=8E=E2=80=9D=E4=B8=80=E8=8A=82?= =?UTF-8?q?=E5=86=85=E5=AE=B9?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index 6b3f00e4..d46dd56f 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -155,5 +155,25 @@ println("square.origin is now at (\(square.origin.x), \(square.origin.y))") Computed Properties sample -### Setter的便捷方式 +### 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 { + var origin = Point() + var size = Size() + var center: Point { + get { + let centerX = origin.x + (size.width / 2) + let centerY = origin.y + (size.height / 2) + return Point(x: centerX, y: centerY) + } + set { + origin.x = newValue.x - (size.width / 2) + origin.y = newValue.y - (size.height / 2) + } + } +} + +``` \ No newline at end of file From 0cf12a947aca6aee22e457a1a1d29886f3808ec4 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sun, 8 Jun 2014 09:33:32 +0800 Subject: [PATCH 28/36] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E4=BA=86=E2=80=9C?= =?UTF-8?q?=E8=AE=A1=E7=AE=97=E5=B1=9E=E6=80=A7=E2=80=9D=E4=B8=80=E8=8A=82?= =?UTF-8?q?=E7=9A=84=E5=86=85=E5=AE=B9?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index d46dd56f..d75c308b 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -176,4 +176,33 @@ struct AlternativeRect { } } -``` \ No newline at end of file +``` + +### 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 +> 必须使用`var`关键字定义计算属性，包括只读计算属性，因为他们的值不是固定的。`let`关键字只用来声明常量属性，表示初始化后再也无法修改的值。 + +只读计算属性的声明可以去掉`get`关键字和花括号： + +``` +struct Cuboid { + var width = 0.0, height = 0.0, depth = 0.0 + var volume: Double { + return width * height * depth + } +} +let fourByFiveByTwo = Cuboid(width: 4.0, height: 5.0, depth: 2.0) +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。 + +## 属性观察者 + From bbc533980194e34c7ac21d033a8edae7da2282a1 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sun, 8 Jun 2014 09:36:56 +0800 Subject: [PATCH 29/36] =?UTF-8?q?=E4=BF=AE=E6=94=B9=E4=BA=86=E8=AE=A1?= =?UTF-8?q?=E7=AE=97=E5=B1=9E=E6=80=A7=E7=9A=84=E5=BC=95=E7=94=A8=E5=86=85?= =?UTF-8?q?=E5=AE=B9=E6=A0=BC=E5=BC=8F?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 1 + 1 file changed, 1 insertion(+) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index d75c308b..c8d79e4d 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -183,6 +183,7 @@ struct AlternativeRect { 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 +> > 必须使用`var`关键字定义计算属性，包括只读计算属性，因为他们的值不是固定的。`let`关键字只用来声明常量属性，表示初始化后再也无法修改的值。 只读计算属性的声明可以去掉`get`关键字和花括号： From 404c89d92d15c52321a7d079db5cffe6976fd569 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sun, 8 Jun 2014 09:40:35 +0800 Subject: [PATCH 30/36] =?UTF-8?q?=E5=B0=86Property=20Observers=E7=94=B1?= =?UTF-8?q?=E2=80=9C=E5=B1=9E=E6=80=A7=E8=A7=82=E5=AF=9F=E8=80=85=E2=80=9D?= =?UTF-8?q?=E6=94=B9=E6=88=90=E4=BA=86=E2=80=9C=E5=B1=9E=E6=80=A7=E7=9B=91?= =?UTF-8?q?=E8=A7=86=E5=99=A8=E2=80=9D?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index c8d79e4d..06f7d98c 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -4,7 +4,7 @@ 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，还可以定义属性观察者来监控属性值的变化，以此来触发一个自定义的操作。属性观察者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。 +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 @@ -205,5 +205,6 @@ println("the volume of fourByFiveByTwo is \(fourByFiveByTwo.volume)") 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。 -## 属性观察者 +## 属性监视器 +属性监视器监控和响应属性值的变化。 \ No newline at end of file From e300b456bf908cf8a62d42fae3299fddf532923c Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sun, 8 Jun 2014 10:04:20 +0800 Subject: [PATCH 31/36] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E4=BA=86=E2=80=9C?= =?UTF-8?q?=E5=B1=9E=E6=80=A7=E7=9B=91=E8=A7=86=E5=99=A8=E2=80=9D=E9=83=A8?= =?UTF-8?q?=E5=88=86=E5=86=85=E5=AE=B9?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index 06f7d98c..762f32f7 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -207,4 +207,29 @@ println("the volume of fourByFiveByTwo is \(fourByFiveByTwo.volume)") ## 属性监视器 -属性监视器监控和响应属性值的变化。 \ No newline at end of file +*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。 + +> 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。 + +可以为属性添加如下的一个或全部监视器： + +- `willSet`在设置新的值之前调用 +- `didSet`在新的值被设置之后立即调用 + +`willSet`监视器会将新的属性值作为固定参数传入，在`willSet`的实现代码中可以为这个参数指定一个名称，如果不指定则参数仍然可用，这时使用默认名称`newValue`表示。 + +类似地，`didSet`监视器会将旧的属性值作为参数传入，可以为该参数命名或者使用默认参数名`oldValue`。 + +> 注意 +> +> `willSet`和`didSet`监视器在属性初始化过程中不会被调用，他们只会当属性的值在初始化之外的地方被设置时被调用。 + +这里是一个`willSet`和`didSet`的例子。 + + + + From d06def1851b4ae4e6d2dde2ba5ad32aaf02e03c7 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Sun, 8 Jun 2014 10:28:45 +0800 Subject: [PATCH 32/36] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E4=BA=86=E2=80=9C?= =?UTF-8?q?=E5=B1=9E=E6=80=A7=E7=9B=91=E8=A7=86=E5=99=A8=E2=80=9D=E7=9A=84?= =?UTF-8?q?=E4=BE=8B=E5=AD=90=E9=83=A8=E5=88=86=E5=86=85=E5=AE=B9?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 39 +++++++++++++++++++++++++++++++- 1 file changed, 38 insertions(+), 1 deletion(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index 762f32f7..577b223c 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -228,8 +228,45 @@ println("the volume of fourByFiveByTwo is \(fourByFiveByTwo.volume)") > > `willSet`和`didSet`监视器在属性初始化过程中不会被调用，他们只会当属性的值在初始化之外的地方被设置时被调用。 -这里是一个`willSet`和`didSet`的例子。 +这里是一个`willSet`和`didSet`的实际例子，其中定义了一个名为`StepCounter`的类，用来统计当人步行时的总步数，可以跟计步器或其他日常锻炼的统计装置的输入数据配合使用。 +``` +class StepCounter { + var totalSteps: Int = 0 { + willSet(newTotalSteps) { + println("About to set totalSteps to \(newTotalSteps)") + } + didSet { + if totalSteps > oldValue { + println("Added \(totalSteps - oldValue) steps") + } + } + } +} +let stepCounter = StepCounter() +stepCounter.totalSteps = 200 +// About to set totalSteps to 200 +// Added 200 steps +stepCounter.totalSteps = 360 +// About to set totalSteps to 360 +// Added 160 steps +stepCounter.totalSteps = 896 +// About to set totalSteps to 896 +// Added 536 steps +``` +`StepCounter`类定义了一个`Int`类型的属性`totalSteps`，它是一个存储属性，包含`willSet`和`didSet`监视器。 + +当`totalSteps`设置新值的时候，它的`willSet`和`didSet`监视器都会被调用，甚至当新的值和现在的值完全相同也会调用。 + +例子中的`willSet`监视器将表示新值的参数自定义为`newTotalSteps`，这个监视器只是简单的将新的值输出。 + +`didSet`监视器在`totalSteps`的值改变后被调用，它把新的值和旧的值进行对比，如果总的步数增加了，就输出一个消息表示增加了多少步。`didSet`没有提供自定义名称，所以默认值`oldValue`表示旧值的参数名。 + +> 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。 + +##全局和本地变量 From 7c7e04c97fde4883adfe78ea7a7399d90aa30b8b Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Mon, 9 Jun 2014 10:34:03 +0800 Subject: [PATCH 33/36] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E4=BA=86=E2=80=9C?= =?UTF-8?q?=E5=85=A8=E5=B1=80=E5=92=8C=E5=B1=80=E9=83=A8=E5=8F=98=E9=87=8F?= =?UTF-8?q?=E2=80=9D=E4=B8=80=E8=8A=82=E7=9A=84=E5=86=85=E5=AE=B9=E3=80=82?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index 577b223c..b38971cc 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -268,5 +268,18 @@ stepCounter.totalSteps = 896 > > 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。 -##全局和本地变量 +##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。 + +另外，在全局或局部范围都可以定义计算型变量和为存储型变量定义监视器，计算型变量跟计算属性一样，返回一个计算的值而不是存储值，声明格式也完全一样。 + +> 注意 +> +> 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 \ No newline at end of file From ae078bdafe2e9217d50c69f781a2dac5147763e9 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Mon, 9 Jun 2014 16:07:54 +0800 Subject: [PATCH 34/36] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E4=BA=86=E2=80=9C?= =?UTF-8?q?=E7=B1=BB=E5=B1=9E=E6=80=A7=E2=80=9D=E7=AC=AC=E4=B8=80=E8=8A=82?= =?UTF-8?q?=E5=86=85=E5=AE=B9?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index b38971cc..c5d7fe79 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -282,4 +282,21 @@ stepCounter.totalSteps = 896 > > 局部范围的常量或变量不会延迟计算。 -##类属性 \ No newline at end of file +##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*。 + +类属性用于定义特定类型所有实例共享的数据，比如所有实例都能用的一个常量（就像 C 语言中的静态常量），或者所有实例都能访问的一个变量（就像 C 语言中的静态变量）。 + +对于值类型（指结构体和枚举）可以定义存储型和计算型类属性，对于类（class）则只能定义计算型类属性。 + +值类型的存储型类属性可以是变量或常量，计算型类属性跟实例的计算属性一样定义成变量属性。 + +> 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。 + +###类属性的语法 + From 85f747ce4b4b5542e21ff3d4dd3a5451f62c3084 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Mon, 9 Jun 2014 16:22:40 +0800 Subject: [PATCH 35/36] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E4=BA=86=E2=80=9C?= =?UTF-8?q?=E7=B1=BB=E5=B1=9E=E6=80=A7=E7=9A=84=E8=AF=AD=E6=B3=95=E2=80=9D?= =?UTF-8?q?=E4=B8=80=E8=8A=82=E5=86=85=E5=AE=B9?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 33 +++++++++++++++++++++++++++++++- 1 file changed, 32 insertions(+), 1 deletion(-) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index c5d7fe79..5a3bde50 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -298,5 +298,36 @@ stepCounter.totalSteps = 896 > > 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。 -###类属性的语法 +###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： + +``` +struct SomeStructure { + static var storedTypeProperty = "Some value." + static var computedTypeProperty: Int { + // return an Int value here + } +} +enum SomeEnumeration { + static var storedTypeProperty = "Some value." + static var computedTypeProperty: Int { + // return an Int value here + } +} +class SomeClass { + class var computedTypeProperty: Int { + // return an Int value here + } +} + +``` + +> 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 From 9a4876e8a633d13681d7bf447daeb49abe46ac49 Mon Sep 17 00:00:00 2001 From: Shiny Zhu Date: Mon, 9 Jun 2014 17:14:00 +0800 Subject: [PATCH 36/36] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E4=BA=86=E2=80=9C?= =?UTF-8?q?=E8=8E=B7=E5=8F=96=E5=92=8C=E8=AE=BE=E7=BD=AE=E7=B1=BB=E5=B1=9E?= =?UTF-8?q?=E6=80=A7=E7=9A=84=E5=80=BC=E2=80=9D=E4=B8=80=E8=8A=82=E5=86=85?= =?UTF-8?q?=E5=AE=B9?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- source/chapter2/10_Properties.md | 88 ++++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+) diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md index 5a3bde50..2f1b9cbc 100644 --- a/source/chapter2/10_Properties.md +++ b/source/chapter2/10_Properties.md @@ -331,3 +331,91 @@ class SomeClass { ###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) +// prints "42" + +println(SomeStructure.storedTypeProperty) +// prints "Some value." +SomeStructure.storedTypeProperty = "Another value." +println(SomeStructure.storedTypeProperty) +// prints "Another value.” + +``` + +下面的例子定义了一个结构体，使用两个存储型类属性来表示多个声道的声音电平值，每个声道有一个 0 到 10 之间的整数表示声音电平值。 + +后面的图表展示了如何联合使用两个声道来表示一个立体声的声音电平值。当声道的电平值是 0，没有一个灯会亮；当声道的电平值是 10，所有灯点亮。本图中，左声道的电平是 9，右声道的电平是 7。 + +Static Properties VUMeter + +上面所描述的声道模型使用`AudioChannel`结构体来表示： + +``` +struct AudioChannel { + static let thresholdLevel = 10 + static var maxInputLevelForAllChannels = 0 + var currentLevel: Int = 0 { + didSet { + if currentLevel > AudioChannel.thresholdLevel { + // cap the new audio level to the threshold level + currentLevel = AudioChannel.thresholdLevel + } + if currentLevel > AudioChannel.maxInputLevelForAllChannels { + // store this as the new overall maximum input level + AudioChannel.maxInputLevelForAllChannels = currentLevel + } + } + } +} + +``` + +结构`AudioChannel`定义了 2 个存储型类属性来实现上述功能。第一个是`thresholdLevel`，表示声音电平的最大上限阈值，它是一个取值为 10 的常量，对所有实例都可见，如果声音电平高于 10，则取最大上限值 10（见后面描述）。 + +第二个类属性是变量存储型属性`maxInputLevelForAllChannels`，它用来表示所有`AudioChannel`实例的电平值的最大值，初始值是 0。 + +`AudioChannel`也定义了一个名为`currentLevel`的实例存储属性，表示当前声道现在的电平值，取值为 0 到 10。 + +属性`currentLevel`包含`didSet`属性监视器来检查每次新设置后的属性值，有如下两个检查： + +- 如果`currentLevel`的新值大于允许的阈值`thresholdLevel`，属性监视器将`currentLevel`的值限定为阈值`thresholdLevel`。 +- 如果修正后的`currentLevel`值大于任何之前任意`AudioChannel`实例中的值，属性监视器将新值保存在静态属性`maxInputLevelForAllChannels`中。 + +> 注意 +> +> 在第一个检查过程中，`didSet`属性监视器将`currentLevel`设置成了不同的值，但这不会再次调用属性监视器。 + +可以使用结构`AudioChannel`来创建表示立体声系统的两个声道`leftChannel`和`rightChannel`： + +``` +var leftChannel = AudioChannel() +var rightChannel = AudioChannel() + +``` + +如果将左声道的电平设置成 7，类属性`maxInputLevelForAllChannels`也会更新成 7： + +``` +leftChannel.currentLevel = 7 +println(leftChannel.currentLevel) +// prints "7" +println(AudioChannel.maxInputLevelForAllChannels) +// prints "7” + +``` + +如果试图将右声道的电平设置成 11，则会将右声道的`currentLevel`修正到最大值 10，同时`maxInputLevelForAllChannels`的值也会更新到 10： + +``` +rightChannel.currentLevel = 11 +println(rightChannel.currentLevel) +// prints "10" +println(AudioChannel.maxInputLevelForAllChannels) +// prints "10” + +``` + +[本章完] \ No newline at end of file