Gist for Medium article about custom button styles

StyledButton.swift

import UIKit

struct Colors {
	static let primary: UIColor = #colorLiteral(red: 0.3215686275, green: 0.7176470588, blue: 0.5333333333, alpha: 1) // #52B788
	static let white: UIColor = .white
	static let lightGray: UIColor = #colorLiteral(red: 0.9254901961, green: 0.9254901961, blue: 0.9254901961, alpha: 1) // #ECECEC
	static let darkGray: UIColor = #colorLiteral(red: 0.6352941176, green: 0.6352941176, blue: 0.6352941176, alpha: 1) // #A2A2A2
}


enum ButtonStyle {
	case primary
	case secondary
	case outlined
	
	
	var backgroundColor: UIColor {
		switch self {
		case .primary:
			return Colors.primary
		case .secondary, .outlined:
			return .clear
		}
	}
	
	var disabledBackgroundColor: UIColor {
		return Colors.lightGray
	}
	
	var borderColor: CGColor {
		switch self {
		case .primary, .secondary:
			return Colors.primary.cgColor
		case .outlined:
			return Colors.primary.cgColor
		}
	}
	
	var textColor: UIColor {
		switch self {
		case .primary:
			return .white
		case .secondary:
			return Colors.primary
		case .outlined:
			return Colors.primary
		}
	}
	
	var disabledTextColor: UIColor {
		return Colors.darkGray
	}
	
	var hasBorder: Bool {
		self == .outlined
	}

}

class StyledButton: UIButton {
	
	var style: ButtonStyle = .primary {
		didSet {
			applyStyle()
		}
	}
	
	override var isEnabled: Bool {
		didSet {
			setEnabled()
		}
	}
	
	init(_ style: ButtonStyle = .primary) {
		super.init(frame: .zero)
		self.style = style
		setup()
	}
	
	required init?(coder: NSCoder) {
		super.init(coder: coder)
		setup()
	}
	
	func setup() {
		titleLabel?.font = .systemFont(ofSize: 18, weight: .semibold)
		layer.cornerRadius = 8
		applyStyle()
	}
	
	func applyStyle() {
		setTitleColor(style.textColor, for: .normal)
		setTitleColor(style.disabledTextColor, for: .disabled)
		backgroundColor = isEnabled ? style.backgroundColor : style.disabledBackgroundColor
		layer.borderWidth = isEnabled && style.hasBorder ? 1.2 : 0
		layer.borderColor = style.borderColor
	}
	
	func setEnabled() {
		layer.borderWidth = isEnabled && style.hasBorder ? 1.2 : 0
		backgroundColor = isEnabled ? style.backgroundColor : style.disabledBackgroundColor
	}

}