An easy way to draw a circle using CAShapeLayer

Question

In questions like How to draw a smooth circle..., ...Draw Circle... and ...draw filled Circles the question and answer is very broad, contains lots of unnecessary steps and

Answer 1

Using CAShapeLayer Class makes drawing easy... 1.Create CAShapeLayer Object 2.Create a Circular path 3.Set the path to the wanted CAShapeLayer path 4.Add the layer to your view

  let shapeLayer = CAShapeLayer()
  let center = view.center
  let circulPath = UIBezierPath(arcCenter: center, radius: 100, startAngle: 0, endAngle: 2.0 * CGFloat.pi, clockwise: true)

  shapeLayer.path = circulPath.cgPath 
  view.layer.addSublayer(shapeLayer)

Note That ,here I draw the circle from center of the view. You can also set the fill color for your circle like bellow:

  shapeLayer.fillColor = UIColor.red.cgColor

for further study you can check on CALayer.com