Understanding Swift’s ConvertPoint

Which coordinate system are you in?

Photo by Ibrahim Boran on Unsplash

Before we start

Difficulty: Beginner | Easy | Normal | Challenging

This article has been developed using Xcode 14.2, and Swift 5.7.2

Keywords and Terminology:

Bounds: Used in a Custom UIView to represent the drawing space’s origin and size

Frame: A rectangle in a superview’s coordinate space that contains the view’s bounds.size in its entirety

Prerequisites:

• You need to be able to create a basic Swift App. The example application I’ve built is created programmatically

The example App

This has been created programmatically, and essentially is three UIView instances placed on a plain background. Please be aware that I’ve set the background as red to attempt to make it as easy as possible to see the two views on top of it.

I’ve created the three views as lazy vas. These have separate colours as follows -