swift语言点评八-枚举

总结：swift中的枚举可以看作变量可以作为case匹配参数的类

Enumerations

枚举的作用：状态列举与匹配

枚举值与类型

If a value (known as a “raw” value) is provided for each enumeration case, the value can be a string, a character, or a value of any integer or floating-point type.

You can define a common set of related cases as part of one enumeration, each of which has a different set of values of appropriate types associated with it.

Enumerations in Swift are first-class types in their own right.

computed properties

instance methods

继承、协议

case

简化

match

.语法

原文地址：https://www.cnblogs.com/feng9exe/p/8710270.html

时间： 2024-10-26 07:38:01

swift语言点评八-枚举的相关文章

Swift语言指南(八)--语言基础之元组

元组元组(Tuples)将多个值组合为一个复合值.元组内的值可以是任何类型,各个元素不需要为相同类型(各个元素之间类型独立,互不干扰--Joe.Huang). 下例中,(404, "Not Found") 是一个描述HTTP状态码的元组.HTTP状态码是当你向WEB服务器请求页面时服务器返回的一个特殊值,如果你(向WEB服务器)请求了一个不存在的网页,返回的状态码就是 404 Not Found : 1 let http404Error = (404, "Not Found

swift语言点评二

一.数据类型 1.基础类型的封装 Swift provides its own versions of all fundamental C and Objective-C types, including Int for integers, Doubleand Float for floating-point values 2.新类型 Swift introduces advanced types not found in Objective-C, such as tuples. Tuples

swift语言点评十七-Designated Initializers and Convenience Initializers

Swift defines two kinds of initializers for class types to help ensure all stored properties receive an initial value. These are known as designated initializers and convenience initializers. Designated:指定的:特指的全初始化与部分初始化 Designated Initializers and

swift语言点评三 - Basic Operators

1.Tuples are compared from left to right, one value at a time, until the comparison finds two values that aren't equal. (1, "zebra") < (2, "apple") You can compare two tuples if they have the same type and the same number of values.

swift语言点评十二-Subscripts

Classes, structures, and enumerations can define subscripts, which are shortcuts for accessing the member elements of a collection, list, or sequence. 下标的形式和函数相同,并且set和get合一 subscript(row: Int, column: Int) -> Double 比较: In addition to simple propert

苹果新的编程语言 Swift 语言进阶（八）－－属性

请转移到此位置阅读,谢谢! 苹果新的编程语言 Swift 语言进阶(八)--属性 http://blog.csdn.net/goohong/article/details/32096289 苹果新的编程语言 Swift 语言进阶(八)--属性,布布扣,bubuko.com

苹果新的编程语言 Swift 语言进阶（七）－－枚举、结构、类

一. 枚举枚举定义了一种包含一组相关值的公共类型.枚举是Swift中的一种与类类似的类型,具有许多传统类才有的特征,例如计算属性.实例方法,能够通过扩展或协议增强功能等. 1.1 枚举定义 Swift 语言的枚举类型的定义语法如下: enum CompassPoint { case North case South case East case West } 枚举语法以一个关键字enum来标识,enum后面包含一个枚举类型名字,枚举定义全部放到一对大括号中. 在枚举中定义的值称为枚举成员值,用

初探swift语言的学习笔记八(保留了许多ＯＣ的实现)

尽管swift作为一门新语言,但还保留了许多OC的机制,使得swift和OC更好的融合在一起.如果没有OC基础的先GOOGLE一下. 如:KVO,DELEGATE,NOTIFICATION. 详见DEMO. import Foundation @objc // 需要打开objc标识,否则@optional编译出错 protocol kvoDemoDelegate { func willDoSomething() @optional func didDoSomething() //可选实现, }

Swift语言指南(十)--字符串与字符

原文:Swift语言指南(十)--字符串与字符字符串是一段字符的有序集合,如"hellow,world"或"信天翁".Swift 中的字符串由 String 类型表示,对应着 Character 类型值的集合. Swift 中的 String 类型为你的编程提供了一个高速的,兼容 Unicode规范的文本处理方式.Swift 创建和处理字符串的语法轻量可读,与 C 语言的字符串语法颇为相似.字符串的拼接非常简单,只需将两个字符串用 + 运算符相加.字符串的值是否