1、声明
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var str = "Hello, playground"
//var str: String = "Hello, playground"
// 空字符串
let emptyString = ""
let emptyString2 = String()
// 使用String()初始化字符串
let str2 = String("Hello, swift")
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2、判断字符串是否为空
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// 判断空字符串
str.isEmpty //false
emptyString.isEmpty //true
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3、字符串拼接
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// String的粘合
let mark = "!!!"
str + mark //Hello, playground!!!
str //Hello, playground
// 常量String和变量String
str += mark
str //Hello, playground!!!
//str2 += mark //let 会报错
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4、字符串插值
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// 字符串插值
let name = "lxy"
let age = 18
let height = 1.78
let s = "My name is \(name), I'm \(age) years old. I'm \(height) meters tall."
print(s) //My name is lxy, I'm 18 years old. I'm 1.78 meters tall.
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5、特殊字符
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// 特殊字符
let s = "\\" =>\
let s = "\"" =>"
let s = "\n" =>换行
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感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！
原文链接：http://blog.csdn.net/u012903898/article/details/52844130