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。
diff --git a/chapter1/02_a_swift_tour.html b/chapter1/02_a_swift_tour.html index 4e2e5936..165e3fee 100644 --- a/chapter1/02_a_swift_tour.html +++ b/chapter1/02_a_swift_tour.html @@ -46,7 +46,7 @@ -本页内容包括：
diff --git a/chapter1/chapter1.html b/chapter1/chapter1.html index 7f62a34d..c2e1d95b 100644 --- a/chapter1/chapter1.html +++ b/chapter1/chapter1.html @@ -46,7 +46,7 @@ -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 50fd12d1..d2dfd863 100644 --- a/chapter2/01_The_Basics.html +++ b/chapter2/01_The_Basics.html @@ -46,7 +46,7 @@ -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。
@@ -849,7 +849,7 @@ println("The status message is \(http200Status.description)")-注意：C 和 Objective-C 中并没有可选这个概念。最接近的是 Objective-C 中的一个特性，一个方法要不返回一个对象要不返回
+nil，nil表示“缺少一个合法的对象”。然而，这只对对象起作用——对于结构体，基本的 C 类型或者美剧类型不起作用。对于这些类型，Objective-C 方法一般会返回一个特殊值（比如NSNotFound）来暗示值缺失。这种方法假设方法的调用者知道并记得对特殊值进行判断。然而，Swift 的可选可以让你暗示任意类型的值缺失，并不需要一个特殊值。注意：C 和 Objective-C 中并没有可选这个概念。最接近的是 Objective-C 中的一个特性，一个方法要不返回一个对象要不返回
nil，nil表示“缺少一个合法的对象”。然而，这只对对象起作用——对于结构体，基本的 C 类型或者枚举类型不起作用。对于这些类型，Objective-C 方法一般会返回一个特殊值（比如NSNotFound）来暗示值缺失。这种方法假设方法的调用者知道并记得对特殊值进行判断。然而，Swift 的可选可以让你暗示任意类型的值缺失，并不需要一个特殊值。
来看一个例子。Swift 的String类型有一个叫做toInt的方法，作用是将一个String值转换成一个Int值。然而，并不是所有的字符串都可以转换成一个整数。字符串"123"可以被转换成数字123，但是字符串"hello, world"不行。
下面的例子使用toInt方法来尝试将一个String转换成Int：
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.
本页包含内容：
diff --git a/chapter2/04_Collection_Types.html b/chapter2/04_Collection_Types.html index 3ada979b..da2f6ee5 100644 --- a/chapter2/04_Collection_Types.html +++ b/chapter2/04_Collection_Types.html @@ -46,7 +46,7 @@ -本页包含内容：
diff --git a/chapter2/07_Closures.html b/chapter2/07_Closures.html index f8190ea3..9040c03b 100644 --- a/chapter2/07_Closures.html +++ b/chapter2/07_Closures.html @@ -46,7 +46,7 @@ -本页内容包含：
diff --git a/chapter2/08_Enumerations.html b/chapter2/08_Enumerations.html index 12c70989..fcb56711 100644 --- a/chapter2/08_Enumerations.html +++ b/chapter2/08_Enumerations.html @@ -46,7 +46,7 @@ -本页包含内容：
diff --git a/chapter2/10_Properties.html b/chapter2/10_Properties.html index c4c61eee..fb07feb4 100644 --- a/chapter2/10_Properties.html +++ b/chapter2/10_Properties.html @@ -46,7 +46,7 @@ -本页包含内容：
diff --git a/chapter2/17_Optional_Chaining.html b/chapter2/17_Optional_Chaining.html index c390aba1..114648f6 100644 --- a/chapter2/17_Optional_Chaining.html +++ b/chapter2/17_Optional_Chaining.html @@ -46,7 +46,7 @@ -（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 index 222a6dcf..c86d633d 100644 --- a/chapter2/19_Nested_Types.html +++ b/chapter2/19_Nested_Types.html @@ -46,7 +46,7 @@ -
本页包含内容：
diff --git a/chapter2/20_Extensions.html b/chapter2/20_Extensions.html index f5b413cc..373219fd 100644 --- a/chapter2/20_Extensions.html +++ b/chapter2/20_Extensions.html @@ -46,7 +46,7 @@ -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 77e309a1..cc74a6eb 100644 --- a/chapter3/01_About_the_Language_Reference.html +++ b/chapter3/01_About_the_Language_Reference.html @@ -46,7 +46,7 @@ -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 5efc39d5..2a100037 100644 --- a/chapter3/02_Lexical_Structure.html +++ b/chapter3/02_Lexical_Structure.html @@ -46,7 +46,7 @@ -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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