Callback function syntax in Swift

Question

I am attempting pass a function to another function and then have the passed function executed passing to it a variable.

Here is my code:

func showSt         


        

Answer 1

In the parameters for showStandardPrompt, you declare callback to have the type ()->(String), which is a function which takes no parameters and returns a String.

You then call it with field.text! as a parameter, which obviously conflicts with the previously given type.

You need to correct the type given to callback to take a String argument and return nothing:

(String)->()