UIButton is a subclass of UIView for displaying buttons in iOS
The UILabel class implements a read-only text view in iOS
"If the uilabel is larger it will then wrap around the uibutton to the next line"
from question "IOS Multiple line Label floating around a UIButton"
"Secondviewcontroller which is a subclass of firstviewcontroller also has a uilabel but has one more uibutton"
from question "How to subclass a ViewController which has IBOutLet and IBAction from storyboard?"