## Swift 字符串 ### 字符串的声明 * 字符串常见的声明方式 ``` let string = "Hello" var str: String = "Hello" // 常用这种方式 let hello = String("Hello") ``` * 空字符串声明 ``` var emptyString = "" var emptyStr = String() ``` ### 字符串成员变量 isEmpty ``` let str = "String" str.isEmpty // 返回 false ``` ### 字符串插值 ``` let name = "curder" let age = 25 let height = 178 let str = "My name is \(name). I am \(age) years old. I am \(height) meters tall." // My name is curder. I am 25 years old. I am 178 meters tall. ```