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gistfile1.txt

import UIKit
import PlaygroundSupport

public class DecoratedButton: UIButton {
    
    var radius: CGFloat = 50 {
        didSet {
            self.setupDecoratedLayers()
        }
    }
    
    var lineWidth: CGFloat = 10 {
        didSet {
            self.setupDecoratedLayers()
        }
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        setupDecoratedLayers()
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    private func setupDecoratedLayers() {
        layer.cornerRadius = radius
        clipsToBounds = true
        
        let path = UIBezierPath(roundedRect: self.bounds, cornerRadius: self.radius)
        
        /// Right Bottom Corner
        // .--.
        // |  |
        // .--*
        let RightBottomCornerLayer = CALayer()
        RightBottomCornerLayer.frame =  CGRect(origin: .zero, size: CGSize(width: self.frame.size.width, height: self.frame.size.height))
        RightBottomCornerLayer.backgroundColor = UIColor.yellow.cgColor
        
        /// Left Top Corner
        // *--.
        // |  |
        // .--.
        let leftTopCornerLayer = CALayer()
        leftTopCornerLayer.frame =  CGRect(origin: .zero, size: CGSize(width: (self.frame.size.width)/2.0, height: (self.frame.size.height)))
        leftTopCornerLayer.backgroundColor = UIColor.red.cgColor
        
        /// Left Bottom Corner
        // .--.
        // |  |
        // *--.
        let leftBottomCornerLayer = CALayer()
        leftBottomCornerLayer.frame =  CGRect(origin: .zero, size: CGSize(width: (self.frame.size.width)/2.0, height: (self.frame.size.height)/2.0))
        leftBottomCornerLayer.backgroundColor = UIColor.green.cgColor
        
        /// Right Top Corner
        // .--*
        // |  |
        // .--.
        let RightTopCornerLayer = CALayer()
        RightTopCornerLayer.frame =  CGRect(origin: .zero, size: CGSize(width: (self.frame.size.width), height: (self.frame.size.height)/2.0))
        RightTopCornerLayer.backgroundColor = UIColor.blue.cgColor
        
        let layers = [RightBottomCornerLayer, leftTopCornerLayer, RightTopCornerLayer, leftBottomCornerLayer]
        
        layers.map { layer in
            let shape = CAShapeLayer()
            shape.path = path.cgPath
            shape.lineWidth = self.lineWidth
            
            shape.strokeColor = UIColor.black.cgColor
            shape.fillColor = UIColor.clear.cgColor
            
            layer.mask = shape
            self.layer.addSublayer(layer)
        }

    }
    
    override public func layoutSubviews() {
        super.layoutSubviews()
        setupDecoratedLayers()
    }
}



let view = UIView(frame: CGRect(x: 0, y: 0, width: 500, height: 500))
view.backgroundColor = #colorLiteral(red: 0.909803926944733, green: 0.47843137383461, blue: 0.643137276172638, alpha: 1.0)
let button = DecoratedButton(frame: CGRect(x: 50, y: 100, width: 400, height: 100))
button.backgroundColor = #colorLiteral(red: 0.721568644046783, green: 0.886274516582489, blue: 0.592156887054443, alpha: 1.0)

view.addSubview(sub)
PlaygroundPage.current.liveView = view