InVision Craft-Plugin Styles for Swift

ExampleCraftSwift.swift

//
//  Example.swift
//
//  Created by Jan Dammshäuser
//  Copyright © 2016 Jan Dammshäuser. All rights reserved.
//

import UIKit

class ExampleVC: UIViewController {

    @IBOutlet weak var exampleLbl: UILabel!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let (font, color) = FontStyles.H2.getStyle() //getting values
        
        exampleLbl.applyFontStyle(.H1) //only setting values
        
    }
}

Extensions.swift

//
//  Extensions.swift
//
//  Created by Jan Dammshäuser
//  Copyright © 2016 Jan Dammshäuser. All rights reserved.
//

import Foundation
import UIKit

extension UILabel {
    func applyFontStyle(fontStyle: FontStyles) {
        let (font, color) = fontStyle.getStyle()
        
        self.font = font
        self.textColor = color
    }
}

extension ColorPalette {
    class func rgba(r: CGFloat, _ g: CGFloat, _ b: CGFloat, _ a: CGFloat) -> UIColor {
        return UIColor(red: r/255, green: g/255, blue: b/255, alpha: a)
    }
}

extension Fonts {
    func name(weight weight: Weights) -> String {
        return "\(self.rawValue)\(weight.rawValue)"
    }
}

extension FontStyles {
    func getStyle() -> (UIFont, UIColor) {
        return (font(), color())
    }
}

Styles.swift

//
//  Styles.swift
//
//  Created by Jan Dammshäuser
//  Copyright © 2016 Jan Dammshäuser. All rights reserved.
//

import Foundation
import UIKit

class ColorPalette: UIColor {
    
    // add new colors (you can copy the values directly from your Styles in Sketch
    class func headerColor() -> UIColor {
        return rgba(50, 50, 50, 1)
    }
    
    class func textColor() -> UIColor {
        return rgba(0, 0, 0, 1)
    }
}

enum Fonts: String {
    
    // append new Font-Families below
    case GillSans
    
    // append new Font Types below
    enum Weights: String {
        case Regular = ""
        case Italic = "-Italic"
        case Light = "-Light"
    }
}

enum FontStyles {
    
    // append text-styles below
    case H1, H2, TextStyle
    
    // define fonts below
    func font() -> UIFont {
        switch self {
        case .H1:
            return UIFont(name: Fonts.GillSans.name(weight: .Light), size: 20)!
        case .H2:
            return UIFont(name: Fonts.GillSans.name(weight: .Italic), size: 15)!
        default:
            return UIFont(name: Fonts.GillSans.name(weight: .Regular), size: 12)!
        }
    }
    
    // define font colors below
    func color() -> UIColor {
        switch self {
        case .H1, .H2: 
            return ColorPalette.headerColor()
        default:
            return ColorPalette.textColor()
        }
    }
}