PolygonalView.swift

//
//  PolygonalView.swift
//  Freebie
//
//  Created by Ryne Cheow on 10/5/14.
//  Copyright (c) 2014 Ryne Cheow. All rights reserved.
//

import UIKit

@IBDesignable
public class PolygonalView: UIView {

    override public init(frame: CGRect) {
        super.init(frame: frame)
        setup()
        // Initialization code
    }
    
    required public init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setup()
    }
    
    override public func prepareForInterfaceBuilder() {
        setup()
    }
    
    @IBInspectable public var sides: Int = 9 {
        didSet {
            updateUI()
        }
    }
    
    @IBInspectable public var borderWidth: CGFloat = 0 {
        didSet {
            updateUI()
        }
    }
    
    @IBInspectable public var borderColor: UIColor = UIColor.clearColor() {
        didSet {
            updateUI()
        }
    }

    @IBInspectable public var cornerRadius: CGFloat = 5 {
        didSet {
            updateUI()
        }
    }
    
    private func setup(){
        let path = UIBezierPath.roundedPolygonPathWithRect(self.bounds, lineWidth: borderWidth, sides: sides, cornerRadius: cornerRadius)
        let maskLayer = CAShapeLayer()
        maskLayer.path = path.CGPath
        maskLayer.lineWidth       = borderWidth;
        maskLayer.strokeColor     = UIColor.clearColor().CGColor
        maskLayer.fillColor       = UIColor.whiteColor().CGColor
        self.layer.mask = maskLayer
        
        let borderLayer = CAShapeLayer()
        borderLayer.path = path.CGPath
        borderLayer.lineWidth       = borderWidth
        borderLayer.strokeColor     = borderColor.CGColor
        borderLayer.fillColor       = UIColor.clearColor().CGColor
        self.layer.addSublayer(borderLayer)
    }
    
    private func updateUI(){
        for layer in self.layer.sublayers as [CALayer] {
            layer.removeFromSuperlayer()
        }
        setup()
    }
}