如何将 Swift 函数存储在变量中

Question

// Assume you have two functions.
// Swift considers these functions as distinct
func cars(left look: String) {}
func cars(right look: String) {}

// How can I store them in a variable for later use?
let c: (left : String) -> ()  = cars
let c2: (right : String) -> () = cars

当我尝试将这些方法存储到变量中时，收到一条错误消息，指出“汽车”不明确。我可以做什么来区分它们？

Answer 1

您必须帮助编译器决定您想要哪个函数，因为在决定函数的签名是否对赋值有效时，它不区分参数名称。

您可以通过具体参数名称来消除您的意图的歧义

let c:  (left :String) -> () = cars(left:)
let c2: (right:String) -> () = cars(right:)