Draw stars in swift! (ref: http://sketchytech.blogspot.com.au/2014/11/swift-stars-in-our-paths-cgpath.html)

Stars.playground.swift

import UIKit
import PlaygroundSupport

func degree2radian(a:CGFloat)->CGFloat {
    let b = CGFloat(Double.pi) * a/180
    return b
}

func polygonPointArray(sides:Int,x:CGFloat,y:CGFloat,radius:CGFloat,adjustment:CGFloat=0)->[CGPoint] {
    let angle = degree2radian(a: 360/CGFloat(sides))
    let cx = x // x origin
    let cy = y // y origin
    let r  = radius // radius of circle
    var i = sides
    var points = [CGPoint]()
    while points.count <= sides {
        let xpo = cx - r * cos(angle * CGFloat(i)+degree2radian(a: adjustment))
        let ypo = cy - r * sin(angle * CGFloat(i)+degree2radian(a: adjustment))
        points.append(CGPoint(x: xpo, y: ypo))
        i -= 1;
    }
    return points
}

func starPath(x:CGFloat, y:CGFloat, radius:CGFloat, sides:Int, pointyness:CGFloat, startAngle:CGFloat=0) -> CGPath {
    let adjustment = startAngle + CGFloat(360/sides/2)
    let path = CGMutablePath.init()
    let points = polygonPointArray(sides: sides,x: x,y: y,radius: radius, adjustment: startAngle)
    let cpg = points[0]
    let points2 = polygonPointArray(sides: sides,x: x,y: y,radius: radius*pointyness,adjustment:CGFloat(adjustment))
    var i = 0
    path.move(to: CGPoint(x:cpg.x,y:cpg.y))
    for p in points {
        path.addLine(to: CGPoint(x:points2[i].x, y:points2[i].y))
        path.addLine(to: CGPoint(x:p.x, y:p.y))
        i += 1
    }
    path.closeSubpath()
    return path
}

func drawStarBezier(x:CGFloat, y:CGFloat, radius:CGFloat, sides:Int, pointyness:CGFloat) -> UIBezierPath {
    
    let startAngle = CGFloat(-1*(360/sides/4)) //start the star off rotated left a quarter of the angle of the sides so that its bottom points appear flat (at least for 5 sided stars)

    let path = starPath(x: x, y: y, radius: radius, sides: sides, pointyness: pointyness, startAngle: startAngle)
    let bez = UIBezierPath(cgPath: path)
    return bez
}

class CustomView: UIView {
    override func draw(_ rect: CGRect) {
        super.draw(rect)
        
        niceBigStar(sides:5)
        
        allStars(rect: rect)
    }
    
    func niceBigStar(sides:Int) {
        let penStar:UIBezierPath = drawStarBezier(x: 200, y: 200, radius: 50, sides: sides, pointyness:2.5)
        
        UIColor.blue.setFill()
        penStar.fill()
    }
    
    func allStars(rect:CGRect) {
        let allStarsPanel = UIBezierPath(rect: CGRect(x: 0, y: 0, width: 40, height: rect.height))
        UIColor.lightGray.setFill()
        allStarsPanel.fill()
        
        let colors = [UIColor.green, UIColor.yellow, UIColor.blue, UIColor.red, UIColor.white]
        var offset:CGFloat = 0
        var color = 0
        for sides in 2...14 {
            let star = drawStarBezier(x: 20, y: 20 + offset, radius: 5, sides: sides, pointyness:3)
            colors[color].setStroke()
            star.stroke()
            offset += 30
            color += 1
            if (color >= colors.count) {
                color = 0
            }
        }
    }
}
let containerView = CustomView(frame: CGRect(x: 0, y: 0, width: 400, height: 400))
containerView.backgroundColor = UIColor.white

PlaygroundPage.current.liveView = containerView

Thank you So much