Swift：声明（和初始化）类型为 function 的变量

Question

I'd like to declare a variable of type (Int)->String , to be used later in the code. How to do this?

This code:

var myfunc: (Int)->String = nil 

gives an error.

Thank you

Answer 1

The variable must be optional type to accept nil . Try:

var myfunc: ((Int) -> String)?

Note: You don't need = nil here, it's redundant.