swift 字符串String的使用方法
1、声明var str = "Hello, playground "
var str: String = "Hell
swift 字符串String的使用方法
1、声明
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")
2、判断字符串是否为空
// 判断空字符串 str.isEmpty //false emptyString.isEmpty //true
3、字符串拼接
// 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
4、字符串插值
// 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.
5、特殊字符
// 特殊字符 let s = "\\" =>\ let s = "\"" =>" let s = "\n" =>换行
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