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") |
2、判断字符串是否为空
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// 判断空字符串str.isEmpty //falseemptyString.isEmpty //true |
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Stringstr += mark str //Hello, playground!!!//str2 += mark //let 会报错 |
4、字符串插值
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// 字符串插值let name = "lxy"let age = 18let height = 1.78let 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
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// 特殊字符let s = "\\" =>\let s = "\"" =>"let s = "\n" =>换行 |
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原文链接：http://blog.csdn.net/u012903898/article/details/52844130
