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枚举语法(Enumeration Syntax) 使用enum关键词并且把它们的整个定义放在一对大括号内: 1enumSomeEumeration {2//enumeration definition goes here3} 以下是指南针四个方向的一个例子: 1enumCompassPoint {2caseNorth3caseSouth4caseEast5caseWest6} 一个枚举中被定义的值(例如 North,South,East和West)是枚举的成...
枚举语法(Enumeration Syntax) ...130 匹配枚举值和Switch 语句...132 关联值(Associated Values )...133 原始值(Raw Values )
Swift is a high-performance system programming language. It has a clean and modern syntax, offers seamless access to existing C and Objective-C code and frameworks, and is memory safe by default.Although inspired by Objective-C and many other languages, Swift is not itself a C-derived ...
2.varanotherEmptyString=String()//initializersyntax 3.//这两个字符串都为空,并且两者等价 您可以通过检查其Boolean类型的isEmpty属性来判断该字符串是否为空, 1.ifemptyString.isEmpty{ 2.println("Nothingtoseehere") 3.} 4.//打印"Nothingtoseehere" ...
Discover the latest language advancements that make your code easier to read and write. Explore the growing number of APIs available as Swift packages. And we'll introduce you to Swift's async/await syntax, structured concurrency, and actors. 14:21 Meet AsyncSequence WWDC21 iOS, iPadOS, ...
Expressive Syntax丰富的语法 Extensibility 可拓展性:可继承、可重写等等 Classes 的问题: 1.Implicit Sharing隐式共享: rgin-top:22px;margin-bottom:22px;line-height:inherit;">可能会导致大量保护性拷贝(Defensive Copy),导致效率降低;也有可能发生竞争条件(race condition),出现不可预知的错误;为了避免race cond...
枚举130 枚举语法(Enumeration Syntax)130 匹配枚举值和Switch 语句132 关联值(Associated Values )133 原始值(Raw Values)135 2.9. 类和结构体137 类和结构体对比138 结构体和枚举是值类型141 类是引用类型143 类和结构体的选择145 集合(Collection)类型的赋值和拷贝行为146 The Swift Programming Language 中文...
1var emptyString =""//empty string literal2var anotherEmptyString = String()//initializer syntax3//these two strings are both empty, and are equivalent to each other 可以通过isEmpty属性检查字符串是否为空: 1ifemptyString.isEmpty {2print("Nothing to see here")3}4//prints "Nothing to see...
Swift is a high-performance system programming language. It has a clean and modern syntax, offers seamless access to existing C and Objective-C code and frameworks, and is memory safe by default. Although inspired by Objective-C and many other languages, Swift is not itself a C-derived langu...