Dashed line border around UIView

Question

How do I add dashed line border around UIView.

Something Like this

Answer 1

Swift 4.2

Based off rmooney's answer as a UIView extension with configurable parameters that have default values set.

Note this does not work if the view has self.translatesAutoresizingMaskIntoConstraints = false

extension UIView {
  func addDashedBorder(_ color: UIColor = UIColor.black, withWidth width: CGFloat = 2, cornerRadius: CGFloat = 5, dashPattern: [NSNumber] = [3,6]) {

    let shapeLayer = CAShapeLayer()

    shapeLayer.bounds = bounds
    shapeLayer.position = CGPoint(x: bounds.width/2, y: bounds.height/2)
    shapeLayer.fillColor = nil
    shapeLayer.strokeColor = color.cgColor
    shapeLayer.lineWidth = width
    shapeLayer.lineJoin = CAShapeLayerLineJoin.round // Updated in swift 4.2
    shapeLayer.lineDashPattern = dashPattern
    shapeLayer.path = UIBezierPath(roundedRect: bounds, cornerRadius: cornerRadius).cgPath

    self.layer.addSublayer(shapeLayer)
  }
}