In what units are sizes and coordinates usually specified in the CGRect structure?

In iOS, the CGRect structure defines a rectangle using coordinates and sizes, which are usually expressed in points.

A point is an abstract unit of measurement, independent of screen resolution, allowing the creation of interfaces that look the same on different devices with varying DPI.

For example, CGRect(x: 10, y: 20, width: 100, height: 50) represents a rectangle located 10 points to the right and 20 points down from the origin, with a width of 100 and a height of 50 points.

This simplifies the development of adaptive interfaces in iOS.