在Swift中使用toString vs String
我希望有人能为我澄清一下Swift中toString()和String()之间是否有区别 示例:在Swift中使用toString vs String,string,swift,tostring,String,Swift,Tostring,我希望有人能为我澄清一下Swift中toString()和String()之间是否有区别 示例: var myInteger: Int myInteger = 9 let myString1 = "I like to play " + toString(myInteger) + "-ball pool" let myString2 = "I like to play " + String(myInteger) + "-ball pool" 您给出的示例没有区别,因为String有一个构造函
var myInteger: Int
myInteger = 9
let myString1 = "I like to play " + toString(myInteger) + "-ball pool"
let myString2 = "I like to play " + String(myInteger) + "-ball pool"
您给出的示例没有区别,因为
String
有一个构造函数,它将接受Int
。(String(…)
是String
类型的构造函数,不是函数。)使用Double
进行尝试,您将得到一个编译器错误
toString()
,但是,它可以接受任何类型的实例-它的泛型参数没有约束。它本质上与使用字符串插值将实例转换为字符串相同,但采用函数形式:
**Swift 3**
let myNumber = 3.3
let myNumberString = String(myNumber)
let myInterpolatedString = "\(myNumber)"
// both are "3.3"