Why does the function conflict?

Question

Objective-C

There are two functions with the same name and different set of parameters.
At the same time, they have a conflict:

I broke my head - I can’t understand how this can be? Help, please, to understand.

Answer 1

In short: ObjC does not support method overloading, so you must use different names for methods.
1) Just rename the second method.
2) (If this is still UIViewController) Move the application logic from its controller to the model. Accordingly, create a class that will perform all calculations and not inherit anything from ObjC.
PSTherefore, I believe that learning swift without objc is useless. You still have to write with objc logic, only swift words.