How to add a border outline color to a UIView
Swift version: 5.6
All 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.cgColorNote 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
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