DDImageButton.swift

import UIKit

public class ResearchButton : UIButton {
    
    private var markView : UIView!
    private var circlePath : UIBezierPath!
    private var circleLayer : CAShapeLayer!
    
    public var borderWeight : CGFloat = 2
    
    public override init(frame: CGRect) {
        super.init(frame: frame)
        initializeConfigurations()
        updateComponent()
    }
    
    public required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        initializeConfigurations()
        updateComponent()
    }
    
    private func initializeConfigurations() {
        markView = UIView()
        self.addSubview(markView)
    }
    
    
    func updateComponent() {
        let componentFrame      = self.frame
        let refSize             = componentFrame.width > componentFrame.height ? componentFrame.height : componentFrame.width
        let offset              = CGFloat(10)
        let imageRect           = CGRect(x: 0, y: 0, width: refSize, height: refSize)
        
        self.imageView?.frame = imageRect
        self.imageView?.contentMode = .ScaleAspectFill
        self.imageView?.layer.cornerRadius = refSize / 2
        self.imageView?.layer.masksToBounds = true
        
        markView.layer.cornerRadius = refSize / 2
        markView.layer.masksToBounds = true
        
        var labelHeight : CGFloat = self.frame.height - offset - refSize
        labelHeight = labelHeight > 0 ? labelHeight : 0
        
        self.titleLabel?.frame = CGRect(x: 0,
                                        y: refSize + offset,
                                        width: refSize,
                                        height: labelHeight)
        self.titleLabel?.textAlignment = .Center
        self.titleLabel?.numberOfLines = 3
        
        let point = CGPoint(x: refSize / 2, y: refSize / 2)
        circlePath = UIBezierPath(arcCenter: point,
                                  radius: refSize / 2 - borderWeight,
                                  startAngle: CGFloat(M_PI * 270 / 180),
                                  endAngle: CGFloat(M_PI * 269 / 180),
                                  clockwise: true)
        
        circleLayer = CAShapeLayer()
        circleLayer.path = circlePath.CGPath
        circleLayer.fillColor = UIColor(colorLiteralRed: 0.5, green: 0.5, blue: 0.5, alpha: 0.0).CGColor
        circleLayer.strokeColor = UIColor.redColor().CGColor
        circleLayer.lineWidth = borderWeight
        
        self.imageView?.layer.addSublayer(circleLayer)
    }
    
    func animateMark() {
        //circleLayer =
    }
    
    public override func layoutSubviews() {
        super.layoutSubviews()
        updateComponent()
    }
    
}