This is List of Base Button Type. If want to add new type just define in this and Handle that type in BaseButton Class.

BaseButton.swift

//
//  BaseButton.swift
//  ViewControllerDemo
//

import UIKit
import Font_Awesome_Swift

/**
 This is List of Base Button Type. If want to add new type just define in this and Handle that type in BaseButton Class.
 
 - default unknown: this is default type

 */
enum BaseButtonType : Int
{
    case unknown = -1
    case primary = 1
    case secondary
    case radio
    case roundedClose
    case close
    case transparent
    case checkbox
    case dropDown
    case search
    case iconText
}

/**
 This is Base Class of BaseButton. Use this class in whole application where you want to use button.
*/
class BaseButton: UIButton
{
    // MARK: - Attributes -
    /**
     Store the type of Base Button. its private. Default value is unknown
    */
    private var baseButtonType : BaseButtonType = .unknown
    /**
     Store the BackgroundColor.
    */
    private var originalBackgroundColor : UIColor!
    private var highlightBackgroundColor : UIColor!
    /**
     Button's TouchUp Event Block.
    */
    private var touchUpInsideEvent : ControlTouchUpInsideEvent!
    
    // MARK: - For Radio Button
    fileprivate var circleLayer : CAShapeLayer! = CAShapeLayer()
    fileprivate var fillCircleLayer : CAShapeLayer! = CAShapeLayer()

    override var isSelected: Bool {
        didSet {
            toggleButon()
        }
    }
    
    /**
     Color of the radio button circle. Default value is UIColor red.
     */
    @IBInspectable var circleColor: UIColor! = UIColor.red {
        didSet {
            if circleColor != nil{
                circleLayer.strokeColor = circleColor.cgColor
                self.toggleButon()
            }
        }
    }
    
    /**
     Radius of RadioButton circle.
     */
    @IBInspectable var circleRadius: CGFloat! = 5.0
    
    fileprivate func circleFrame() -> CGRect {
        var circleFrame = CGRect(x: 0, y: 0, width: 2*circleRadius, height: 2*circleRadius)
        circleFrame.origin.x = 0 + circleLayer.lineWidth
        circleFrame.origin.y = bounds.height/2 - circleFrame.height/2
        return circleFrame
    }

    
    /**
     Toggles selected state of the button.
     */
    func toggleButon() {
        if self.isSelected {
            fillCircleLayer.fillColor = circleColor.cgColor
        } else {
            fillCircleLayer.fillColor = UIColor.clear.cgColor
        }
    }
    
    fileprivate func circlePath() -> UIBezierPath {
        return UIBezierPath(ovalIn: circleFrame())
    }
    
    fileprivate func fillCirclePath() -> UIBezierPath {
        return UIBezierPath(ovalIn: circleFrame().insetBy(dx: 2, dy: 2))
    }

    
    // MARK: - Lifecycle -
    init(type : UIButtonType){
        super.init(frame: CGRect.zero)
    }
    
    /**
     Init method of BaseButton
     - parameter type: Give the button's type. Ex. BaseButtonType.primary
    */
    init(type : BaseButtonType) {
        super.init(frame: CGRect.zero)
        baseButtonType = type
        self.setCommonProperties()
        self.setlayout()
    }
    
    /**
     Init method of BaseButton with SuperView object
     - parameter Type : Give the button's type. Ex. BaseButtonType.primary
     - parameter iSuperView : Object of Button's superview. If its nil than button will not added in this view otherwise button will be added as subview.
    */
    init(ibuttonType : BaseButtonType, iSuperView: UIView?) {
        super.init(frame: CGRect.zero)
        
        baseButtonType = ibuttonType
        self.setCommonProperties()
        self.setlayout()
        
        if(iSuperView != nil){
            iSuperView?.addSubview(self)
        }
    }
    
    required init(coder aDecoder: NSCoder) {
        super.init(coder : aDecoder)!
    }
    
    /**
     Its will free the memory of basebutton's current hold object's. Mack every object nill her which is declare in class as Swift not automattically release the object.
    */
    deinit
    {
        originalBackgroundColor = nil
        highlightBackgroundColor = nil
        touchUpInsideEvent = nil
        circleLayer = nil
        fillCircleLayer = nil
        circleColor = nil
        circleRadius = nil
    }
    
    /**
     Here we had override the layoutSubviews method for do the layout work when its called. its necessory, when useing the Autolayout Because here he we get the actual / real frame of view.
    */
    override func layoutSubviews(){
        super.layoutSubviews()
        
        switch baseButtonType {
        case .radio:
            circleLayer.frame = bounds
            circleLayer.path = circlePath().cgPath
            fillCircleLayer.frame = bounds
            fillCircleLayer.path = fillCirclePath().cgPath
            self.titleEdgeInsets = UIEdgeInsetsMake(0, 30, 0, 0)
            
            break
        default:
            
            break
        }
    }
    
    // MARK: - Layout - 
    /**
     This method is called from Init method. its will set the Common properties like backgroundcolor, text color, font  and border according to type.
    */
    func setCommonProperties() {
        
        self.isExclusiveTouch = false
        self.translatesAutoresizingMaskIntoConstraints = false
        
        switch baseButtonType
        {
            
        case .primary:
            
            self.backgroundColor = Color.buttonPrimaryBG.value
            self.setTitleColor(Color.buttonPrimaryTitle.value, for: UIControlState())
            self.titleLabel?.font = UIFont(name: FontStyle.bold, size: currentDevice.isIpad ? 18.0 : 14.0)
            self.titleEdgeInsets = UIEdgeInsetsMake(3, 0, 0, 0)
            
            break
            
        case .iconText:
            self.backgroundColor = UIColor.clear
            self.setFATitleColor(color: Color.buttonAwesomeIcon.value)
            self.titleLabel?.font = UIFont(name: FontStyle.bold, size: currentDevice.isIpad ? 16.0 : 13.0)
            break
            
        case .secondary:
            
            self.backgroundColor = Color.buttonSecondaryBG.value
            self.setTitleColor(Color.buttonSecondaryTitle.value, for: UIControlState())
            self.titleLabel?.font = UIFont(name: FontStyle.bold, size: currentDevice.isIpad ? 18.0 : 14.0)
            self.titleEdgeInsets = UIEdgeInsetsMake(3, 0, 0, 0)
            
            break
            
        case .transparent:
            
            self.backgroundColor = UIColor.clear
            self.setTitleColor(Color.buttonPrimaryTitle.value, for: .normal)
            self.titleLabel?.font = UIFont(name: FontStyle.bold, size: currentDevice.isIpad ? 20.0 : 16.0)
            self.titleEdgeInsets = UIEdgeInsetsMake(3, 0, 0, 0)
            break;
            
    
        case .radio:
            
            circleLayer.frame = bounds
            circleLayer.lineWidth = 2
            circleLayer.fillColor = UIColor.clear.cgColor
            circleLayer.strokeColor = circleColor.cgColor
            layer.addSublayer(circleLayer)
            fillCircleLayer.frame = bounds
            fillCircleLayer.lineWidth = 2
            fillCircleLayer.fillColor = UIColor.clear.cgColor
            fillCircleLayer.strokeColor = UIColor.clear.cgColor
            layer.addSublayer(fillCircleLayer)
            self.titleEdgeInsets = UIEdgeInsetsMake(0, 30, 0, 0)
            self.toggleButon()
            self.setTitleColor(Color.buttonSecondaryBG.value, for: UIControlState())
            self.circleColor = Color.buttonPrimaryBG.value
            self.titleLabel?.font = UIFont(name: FontStyle.bold, size: currentDevice.isIpad ? 18.0 : 14.0)
            self.contentHorizontalAlignment = .left
            self.circleRadius = 10.0
            break
            
        case .roundedClose:
            
            self.backgroundColor = Color.buttonPrimaryBG.value
            self.setTitleColor(Color.buttonPrimaryTitle.value, for: .normal)
            self.titleLabel?.font = UIFont(name: FontStyle.bold, size: currentDevice.isIpad ? 18.0 : 14.0)
            self.titleEdgeInsets = UIEdgeInsetsMake(3, 0, 0, 0)
            self.setBorder(Color.buttonBorder.value, width: 1.0, radius: ControlLayout.borderRadius)
            break
            
        case .checkbox:
 
            self.backgroundColor = Color.buttonPrimaryBG.value
            self.setImage(UIImage(named: ""), for: UIControlState.normal)
            self.setImage(UIImage(named: ""), for: UIControlState.highlighted)
            self.layer.borderColor = Color.buttonBorder.value.cgColor
            self.layer.borderWidth = 1.0
            self.setImage(UIImage(named: "CheckMark"), for: UIControlState.selected)
            break
            
        case .close :
            
            self.backgroundColor = UIColor.clear
            self.setImage(UIImage(named: "Close"), for: UIControlState.normal)
            self.setImage(UIImage(named: "Close"), for: UIControlState.highlighted)
            self.layer.cornerRadius = 20.0
            self.clipsToBounds = true
            break

        case .dropDown:
            
            self.backgroundColor = Color.buttonPrimaryBG.value
            self.setTitleColor(Color.buttonPrimaryTitle.value, for: .normal)
            self.titleLabel?.font = UIFont(name: FontStyle.bold, size: currentDevice.isIpad ? 17.0 : 13.0)
            self.titleEdgeInsets = UIEdgeInsetsMake(3, 10, 0, 35)
            self.contentHorizontalAlignment = .left
            break
            
        case .search:
            
            self.layer.cornerRadius = CGFloat(50 / 2)
            self.layer.shadowOpacity = 1
            self.layer.shadowRadius = 2
            self.layer.shadowOffset = CGSize(width: 1, height: 1)
            self.layer.shadowColor = Color.buttonPrimaryShadow.value.cgColor
            self.setFAIcon(icon: FAType.FASearch, iconSize: 25.0, forState: .normal)
            self.backgroundColor = Color.buttonSecondaryBG.value
            self.contentEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
            self.isUserInteractionEnabled = true
            self.translatesAutoresizingMaskIntoConstraints = false
            
            break
            
        default:
            break
        }
        
        originalBackgroundColor = self.backgroundColor

        if originalBackgroundColor != nil
        {
            highlightBackgroundColor = originalBackgroundColor.darkerColorForColor()
        }
        
        self.addTarget(self, action: #selector(buttonTouchUpInsideAction), for: .touchUpInside)
        self.addTarget(self, action: #selector(buttonTouchUpOutsideAction), for: .touchUpOutside)
        self.addTarget(self, action: #selector(buttonTouchUpOutsideAction), for: .touchCancel)
        self.addTarget(self, action: #selector(buttonTouchDownAction), for: .touchDown)
    }
    
    /**
     This method is called from init method and set the layout related thing like default heigt and width of Button as per type.
    */
    func setlayout(){
        
        var baseLayout : AppBaseLayout!
        baseLayout = AppBaseLayout()
        
        baseLayout.viewDictionary = ["button" : self]
        
        var buttonHeight : CGFloat!
        buttonHeight = currentDevice.isIpad ? 50.0 : 35.0
        
        switch baseButtonType {
            
        case .transparent:
            
            buttonHeight = 20.0
            break
            
        case .checkbox:
            
            buttonHeight = 30.0
            break
            
        case .iconText :
            
            buttonHeight = currentDevice.isIpad ? 50.0 : 35.0
            break
            
        case .roundedClose:
            
            buttonHeight = 30.0
            break
            
        case .close:
            
            buttonHeight = currentDevice.isIpad ? 60.0 : 40.0
            break
            
        case .radio :
            
            buttonHeight = 40.0
            break
            
        case .search:
            buttonHeight = 50.0
            break
        default:
            break
        }
        
        switch baseButtonType {
            
        case .primary,
             .secondary,.iconText:
            
            baseLayout.metrics = ["buttonHeight" : buttonHeight]
            
            baseLayout.control_H = NSLayoutConstraint.constraints(withVisualFormat: "V:[button(buttonHeight)]", options: NSLayoutFormatOptions(rawValue : 0), metrics: baseLayout.metrics, views: baseLayout.viewDictionary)
            
            self.addConstraints(baseLayout.control_H)
            
            break
            
        case .dropDown :
            
            var dropDownIcon : UILabel!
            dropDownIcon = UILabel()
            dropDownIcon .font = UIFont(name: FontStyle.bold, size: 13.0)
            dropDownIcon.backgroundColor = UIColor(patternImage: UIImage(named: "down")!)
            dropDownIcon.translatesAutoresizingMaskIntoConstraints = false
            self.addSubview(dropDownIcon)
            
            baseLayout.viewDictionary = ["button" : self , "dropDownIcon" : dropDownIcon]
            baseLayout.metrics = ["buttonHeight" : buttonHeight , "iconSize" : 20.0 ]
            
            baseLayout.control_H = NSLayoutConstraint.constraints(withVisualFormat: "V:[button(buttonHeight)]", options: NSLayoutFormatOptions(rawValue : 0), metrics: baseLayout.metrics, views: baseLayout.viewDictionary)
            self.addConstraints(baseLayout.control_H)
            
            
            baseLayout.control_V = NSLayoutConstraint.constraints(withVisualFormat: "V:|[dropDownIcon]|", options: NSLayoutFormatOptions(rawValue : 0), metrics: baseLayout.metrics, views: baseLayout.viewDictionary)
            
            baseLayout.position_Right = NSLayoutConstraint(item: dropDownIcon, attribute: .trailing, relatedBy: .equal, toItem: self, attribute: .trailing, multiplier: 1.0, constant: -5.0)
            
            baseLayout.size_Width = NSLayoutConstraint(item: dropDownIcon, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1.0, constant: 20.0)
            
            self.addConstraint(baseLayout.size_Width)
            self.addConstraints(baseLayout.control_V)
            self.addConstraint(baseLayout.position_Right)
            
            dropDownIcon = nil
            
            break
            
        case .roundedClose , .close,.checkbox,.search:
            
            baseLayout.metrics = ["buttonHeight" : buttonHeight]
            
            baseLayout.control_H = NSLayoutConstraint.constraints(withVisualFormat: "H:[button(buttonHeight)]", options: NSLayoutFormatOptions(rawValue : 0), metrics: baseLayout.metrics, views: baseLayout.viewDictionary)
            
            baseLayout.control_V = NSLayoutConstraint.constraints(withVisualFormat: "V:[button(buttonHeight)]", options: NSLayoutFormatOptions(rawValue : 0), metrics: baseLayout.metrics, views: baseLayout.viewDictionary)
            
            self.addConstraints(baseLayout.control_H)
            self.addConstraints(baseLayout.control_V)
            break
            
        default:
            break
        }
        
        baseLayout.releaseObject()
        baseLayout = nil
        buttonHeight = nil
    }
    
    // MARK: - Public Interface -
    /**
     This method is used to get the touch up event of Button in its respective view and superview. 
     - parameter event: its Set the event block to touchUp event and execute when button clicked.
    */
    open func setButtonTouchUpInsideEvent(_ event : @escaping ControlTouchUpInsideEvent) {
       
        originalBackgroundColor = self.backgroundColor
        touchUpInsideEvent = event
    }
    
    // MARK: - User Interaction -
    /**
     This method is Target method of button when button clicke, touchup inside etc. Its execute the TouchUp block and control passed to resepective view and viewcontroller where it's set.
     - parameter sender: Object of clicked button.
    */
    func buttonTouchUpInsideAction(_ sender : AnyObject)
    {
        self.backgroundColor = originalBackgroundColor
        switch baseButtonType
        {
        case .checkbox:
            self.isSelected = !self.isSelected
            break
        default:
            break
        }
        
        if(touchUpInsideEvent != nil){
             touchUpInsideEvent(sender , "" as AnyObject)
        }
    }
    
    /**
     This method is occure after Button's touchup inside event occure.
    */
    @objc private func buttonTouchUpOutsideAction(_ sender : AnyObject) {
        self.backgroundColor = originalBackgroundColor
    }
    
    /**
     This method is occure before Button's touchUp Inside Event occure.
    */
    @objc private func buttonTouchDownAction(_ sender : AnyObject) {
        self.backgroundColor = highlightBackgroundColor
    }
    
    // MARK: - Internal Helpers -
    
}