Swift version: 5.1
UIView subclasses have a built-in way to draw a border around them using their underlying
CALayer. For example, to draw a 10-point red border around a view, you'd use this:
yourView.layer.borderWidth = 10 yourView.layer.borderColor = UIColor.red.cgColor
Note that you need to use the
cgColor property of your
UIColor in order for this to work. Adding a border to a view even works if you also round the corners of your view – it's very flexible!
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Available from iOS 3.2
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.