Bounds and frame differences

 

What are absolute and relative coordinate values?
Absolute coordinates: X and Y are relative to the coordinate origin.
Bounds refers to the coordinates and sizes of the view in its own coordinate system, while frame refers to the coordinates and sizes of the view in its superview coordinate system,
The difference lies in the coordinate system.

Frame is the relative coordinate.

Bounds is the absolute coordinate.
Obviously, the bounds origin is (0, 0), while the frame origin is arbitrary.
Frame if a button is in a table, the coordinate of the frame of the button is relative, not relative to the screen, that is, relative coordinate, not absolute coordinate.
Obviously, one is the coordinate system with its own origin and the other is the coordinate system with the screen as the origin.