Simple HTML/Android like Radio Button implementation

Trust/UI/RadioButton.swift

@@ -0,0 +1,68 @@
+//
+//  RadioButton.swift
+//  Alpha-Wallet
+//
+//  Created by Oguzhan Gungor on 3/4/18.
+//  Copyright © 2018 Alpha-Wallet. All rights reserved.
+//
+
+import UIKit
+
+@IBDesignable
+class RadioButton: UIButton {
+
+    @IBInspectable
+    var space: CGFloat = 8 {
+        didSet {
+            self.setNeedsDisplay()
+        }
+    }
+
+    @IBInspectable
+    var buttonColor: UIColor = UIColor.gray {
+        didSet {
+            self.setNeedsDisplay()
+        }
+    }
+
+    @IBInspectable
+    var isOn: Bool = false {
+        didSet {
+            self.setNeedsDisplay()
+        }
+    }
+
+    override
+    func draw(_ rect: CGRect) {
+        self.contentMode = .scaleAspectFill
+        drawCircles(rect: rect)
+    }
+
+    func drawCircles(rect: CGRect) {
+        var path = UIBezierPath()
+        path = UIBezierPath(ovalIn: CGRect(x: 0, y: 0, width: rect.width, height: rect.height))
+
+        let circleLayer = CAShapeLayer()
+        circleLayer.path = path.cgPath
+        circleLayer.lineWidth = 3
+        circleLayer.strokeColor = buttonColor.cgColor
+        circleLayer.fillColor = UIColor.white.cgColor
+        layer.addSublayer(circleLayer)
+
+        if isOn {
+            let innerCircleLayer = CAShapeLayer()
+            let rectForInnerCircle = CGRect(x: space, y: space, width: rect.width - 2 * space, height: rect.height - 2 * space)
+            innerCircleLayer.path = UIBezierPath(ovalIn: rectForInnerCircle).cgPath
+            innerCircleLayer.fillColor = buttonColor.cgColor
+            layer.addSublayer(innerCircleLayer)
+        }
+        self.layer.shouldRasterize = true
+        self.layer.rasterizationScale = UIScreen.main.nativeScale
+    }
+
+    override
+    func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
+        isOn = !isOn
+        self.setNeedsDisplay()
+    }
+}