Swift Round Button with animation

RoundButton.swift

//
//  RoundButton.swift
//  Toni Hoffmann
//
//  Created by Toni Hoffmann on 09.12.16.
//  Copyright © 2016 Toni Hoffmann. All rights reserved.
//
// This was created in regards of an Exif Remover App, build with Swift for iPhone
//
import UIKit

extension UIView{
    func animateTo(scaleSize: CGFloat){
        UIView.animate(withDuration: 0.1, delay: 0, options: [UIViewAnimationOptions.allowUserInteraction, UIViewAnimationOptions.allowAnimatedContent], animations: {
            self.transform = CGAffineTransform(scaleX: scaleSize, y: scaleSize)
        }, completion: nil)
    }
    
    func bobbleTo(scaleSize: CGFloat, strength: CGFloat){
        let larger = transform.a <= scaleSize
        
        var bobbleScaleSize = scaleSize * strength
        
        if(!larger){
            bobbleScaleSize = scaleSize * (1 / strength)
        }
        UIView.animate(withDuration: 0.1, delay: 0, options: UIViewAnimationOptions.curveEaseOut, animations: {
            self.transform = CGAffineTransform(scaleX: bobbleScaleSize, y: bobbleScaleSize)
        }, completion: {
            (value: Bool) in
            UIView.animate(withDuration: 0.1, animations: {
                self.transform = CGAffineTransform(scaleX: scaleSize, y: scaleSize)
            })
        })
    }
    func bobbleTo(scaleSize: CGFloat){
        bobbleTo(scaleSize: scaleSize, strength: 1.1)
    }
}

class BobbleButton: UIButton{
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)
        // Smooth small animation
        animateTo(scaleSize: 0.8)
    }
    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesEnded(touches, with: event)
        // Bubbly bigger aniomation
        bobbleTo(scaleSize: 1.0)
    }
}

class RoundButton: BobbleButton {
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        // Disable hightlite status
        if buttonType == UIButtonType.custom{
            if backgroundImage(for: .normal) == nil{
                setBackgroundImage(UIImage(), for: .normal)
            }
            adjustsImageWhenHighlighted = false
        }
        
    }
    
    
    override func didMoveToSuperview() {
        // Always have the correct corner radius
        self.layer.cornerRadius = self.bounds.size.width / 2
    }
}

class RoundAddButton: RoundButton{
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        if(titleLabel == nil){
            print("No Title Label")
        }
        // Adding a beautiful + label
        titleEdgeInsets = UIEdgeInsets(top: -10, left: 0, bottom: 0, right: 0)
        adjustsImageWhenHighlighted = false
        setTitle("+", for: .normal)
        titleLabel!.font = UIFont (name: "HelveticaNeue-UltraLight", size: 64)
        setTitleColor(UIColor.white, for: .normal)
    }
}