Change UIView Background Color.

If I understand correctly:

• you have a view with a background color
• you want to change this background color on a specific part ?

A simple way to do this is to insert a subview, of the given shape and size, at the bottom of the subviews hierarchy.

First create subView (areaView), add it to overallView, then send to back:

let rect = CGRect(x: 10, y: 10, width: 100, height: 100)  // Whatever rect you want
let areaView = UIView(frame: rect)
overallView.addSubview(areaView)
overallView.sendSubviewToBack(areaView)

If you want a non rectangular shape, create it with a BezierPath.