Dashed line border around UIView

Question

How do I add dashed line border around UIView.

Something Like this

Answer 1

Swift 5+

import UIKit

class DashedBorderView: UIView {

    private let borderLayer = CAShapeLayer()

    init(color: UIColor, width: CGFloat = 1) {
        super.init(frame: CGRect.zero)

        let pattern: [NSNumber] = [NSNumber(value: Float(5 * width)), NSNumber(value: Float(3 * width))]

        borderLayer.backgroundColor = nil
        borderLayer.fillColor = nil
        borderLayer.lineDashPattern = pattern
        borderLayer.lineWidth = width
        borderLayer.strokeColor = color.cgColor

        layer.addSublayer(borderLayer)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func draw(_ rect: CGRect) {
        borderLayer.frame = bounds
        borderLayer.path = UIBezierPath(roundedRect: rect, cornerRadius: layer.cornerRadius).cgPath
    }
}

How to use:

// f.e. inside UIViewController

let viewWithDashedBorder = DashedBorderView(color: .red, width: 2)
view.addSubview(viewWithDashedBorder)