How to make a login system using xCode?

Hello guys!

I'm trying to make a login system;

Is it possible to make it like this:

Put a text box for the username and password and a label called "Sign in"

How can I make so that the username and password box get's my input box on my PHP website and that "Sign In" will be the Submit?

I don't want to use the HTTP way...

Thank you 😀!