What is the unit of NSPoint, CGPoint, NSSize, CGSize and NSRect, CGRect?
nspoint, nsrect, nsview, uiview, units-of-measurement
Solution
The unit of `CGPoint`, etc. is `point`. A point represents a pixel on non-retina screens and two pixels on retina screens.
Problem
What is the unit of CGPoint, CGSize and CGRect ; NSSize, NSPoint and NSRect?