Using a Unity UI Textfield in a Button?

Hi, I've got a button to save a players name linked up to a Function:

public void SaveUsername (string User) {
Username = User;
}

How can I use the text entered in the Unity UI Textfield as User? Also I've noticed you can't link a button to a function with more than two requests, e.g.:

public void Example (string Test, bool Test2) {
stringEx = Test;
GameObject.SetActive(Test2);
}

Is there a way around this?

 

No. You need to use a wrapper function.

Also, I think you meant "parameters" or "arguments," not "requests."

 

It's alright now, after posting that I pretty much figured it out but decided to stick with using OnGUI instead. I did indeed, lack of sleep effects my wording.