Swift - Extra Argument in call

Question

I am trying to call a function declared in ViewController class from DetailViewController class.

When trying to debug the \'Extra Argument in call\" error pops up.<

Answer 1

This error will ensue, if there is a conflict between a class/struct method, and a global method with same name but different arguments. For instance, the following code will generate this error:

You might want to check if there is such conflict for your setCity method.