RoundedView

RoundedView.swift

final class RoundedView: UIView {
  
  private let cornerRadius: CGFloat
  private let cornerCurve: CALayerCornerCurve
  private let color: UIColor
  
  init(radius: CGFloat = 50, cornerCurve: CALayerCornerCurve, color: UIColor) {
    self.cornerRadius = radius
    self.cornerCurve  = cornerCurve
    self.color        = color
    super.init(frame: .zero)
    self.commonInit()
  }
  
  ...
  
  private func commonInit() {
    self.layer.cornerRadius = self.cornerRadius
    self.layer.cornerCurve  = self.cornerCurve
    self.backgroundColor    = self.color
  }
}

let continuousView = RoundedView(cornerCurve: .continuous, color: .red)
self.view.addSubview(continuousView)
continuousView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
  continuousView.centerXAnchor.constraint(equalTo: self.view.centerXAnchor),
  continuousView.centerYAnchor.constraint(equalTo: self.view.centerYAnchor),
  continuousView.widthAnchor.constraint(equalToConstant: 160),
  continuousView.heightAnchor.constraint(equalTo: continuousView.widthAnchor)
])