字符串初始化
1、初始化
- let someString = "Some string literalvalue"
-
-
-
- let wiseWords = "\"Imagination is moreimportant than knowledge\" -Einstein" let dollarSign = "\x24" // $,
- Unicodescalar U+0024
-
- let blackHeart = "\u2665" // ♥,
- Unicodescalar U+2665
-
- let sparklingHeart = "\U0001F496" //
-
- , Unicode scalarU+1F496
2、空值
- var emptyString = "" //
- 空串初始化
- var anotherEmptyString = String() // 通 过初始化函数初始化
-
3、空值判断
- if emptyString.isEmpty{
-
- println("Nothing to see here")
-
- }
字符串修改
var 声明的可以修改，let 不能修改。
- var variableString = "Horse" variableString+= " and carriage"
-
-
-
-
- let constantString = "Highlander" constantString += " and another
-
- Highlander" //错误
-
字符串插入
- let multiplier = 3
-
- let message = "\(multiplier) times 2.5 is
- \(Double(multiplier) * 2.5)"
字符串长度
使用 countElements函数。
- let unusualMenagerie = "Koala , Snail, Penguin,Dromedary" println("unusualMenagerie has
- \(countElements(unusualMenagerie))
- characters")
比较字符串相等
- let quotation = "We‘re a lot alike, you and I."let sameQuotation = "We‘re a lot alike, youand I."
-
-
- if quotation == sameQuotation {
-
- println("These two strings areconsidered equal")
-
- }
Swift交流讨论论坛论坛：
http://www.cocoagame.net
欢迎加入Swift技术交流群：362298485
Swift字符串类型,布布扣,bubuko.com
Swift字符串类型
原文：http://www.cnblogs.com/iOS-Blog/p/3791460.html
