A Simple ToggleButton with Color (subclassed UIButton)

ToggleButton.swift

import UIKit

class ToggleButton: UIButton {
    @IBInspectable var toggledTintColor : UIColor?
    private var prevTintColor : UIColor?
    
    var isOn : Bool = false
    
    convenience init() {
        self.init(frame: CGRect.zero);
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.initToggleButton()
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        self.initToggleButton()
    }
    
    func initToggleButton() {
        self.addAction(for: .touchUpInside) {
            if self.isOn {
                self.tintColor = self.prevTintColor
            } else {
                self.prevTintColor = self.tintColor
                self.tintColor = self.toggledTintColor
            }
            self.isOn = !self.isOn
        }
    }
    
    deinit {
        self.removeTarget(self, action: nil, for: .touchUpInside)
    }
}