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How to add a border outline color to a UIView

Written by Paul Hudson    @twostraws

Any UIView subclass has a built-in way to draw a border around it using its underlying CALayer. For example, to draw a 10-point black border around a view, you'd use this:

yourView.layer.borderWidth = 10
yourView.layer.borderColor = UIColor.black.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!

Available from iOS 3.2

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