how to use exported style from Paint Code

Assets.swift

//
//  Assets.swift
//  Hello
//
//  Created by Haithem on 28/08/2019.
//  Copyright © 2019 highthem. All rights reserved.
//
//  Generated by PaintCode
//  http://www.paintcodeapp.com
//

import UIKit

public class Assets : NSObject {

    //// Cache

    private struct Cache {
        static let gold: UIColor = UIColor(red: 0.937, green: 0.808, blue: 0.290, alpha: 1.000)
        static let green: UIColor = UIColor(red: 0.145, green: 0.682, blue: 0.533, alpha: 1.000)
        static let red: UIColor = UIColor(red: 0.843, green: 0.353, blue: 0.290, alpha: 1.000)
        static var imageOfFailfilled: UIImage?
        static var failfilledTargets: [AnyObject]?
    }

    //// Colors

    @objc dynamic public class var gold: UIColor { return Cache.gold }
    @objc dynamic public class var green: UIColor { return Cache.green }
    @objc dynamic public class var red: UIColor { return Cache.red }

    //// Drawing Methods

    @objc dynamic public class func drawStarfilled(frame targetFrame: CGRect = CGRect(x: 0, y: 0, width: 50, height: 50), resizing: ResizingBehavior = .aspectFit) {
        //// General Declarations
        let context = UIGraphicsGetCurrentContext()!
        
        //// Resize to Target Frame
        context.saveGState()
        let resizedFrame: CGRect = resizing.apply(rect: CGRect(x: 0, y: 0, width: 50, height: 50), target: targetFrame)
        context.translateBy(x: resizedFrame.minX, y: resizedFrame.minY)
        context.scaleBy(x: resizedFrame.width / 50, y: resizedFrame.height / 50)


        //// Star Drawing
        context.saveGState()
        context.translateBy(x: 25.42, y: 27)

        let starPath = UIBezierPath()
        starPath.move(to: CGPoint(x: -0.57, y: -25))
        starPath.addLine(to: CGPoint(x: 6.77, y: -10.11))
        starPath.addLine(to: CGPoint(x: 23.2, y: -7.73))
        starPath.addLine(to: CGPoint(x: 11.31, y: 3.86))
        starPath.addLine(to: CGPoint(x: 14.12, y: 20.23))
        starPath.addLine(to: CGPoint(x: -0.57, y: 12.5))
        starPath.addLine(to: CGPoint(x: -15.27, y: 20.23))
        starPath.addLine(to: CGPoint(x: -12.46, y: 3.86))
        starPath.addLine(to: CGPoint(x: -24.35, y: -7.73))
        starPath.addLine(to: CGPoint(x: -7.92, y: -10.11))
        starPath.close()
        Assets.gold.setFill()
        starPath.fill()

        context.restoreGState()
        
        context.restoreGState()

    }

    @objc dynamic public class func drawCheckfilled(frame targetFrame: CGRect = CGRect(x: 0, y: 0, width: 50, height: 50), resizing: ResizingBehavior = .aspectFit) {
        //// General Declarations
        let context = UIGraphicsGetCurrentContext()!
        
        //// Resize to Target Frame
        context.saveGState()
        let resizedFrame: CGRect = resizing.apply(rect: CGRect(x: 0, y: 0, width: 50, height: 50), target: targetFrame)
        context.translateBy(x: resizedFrame.minX, y: resizedFrame.minY)
        context.scaleBy(x: resizedFrame.width / 50, y: resizedFrame.height / 50)


        //// Color Declarations
        let white = UIColor(red: 1.000, green: 1.000, blue: 1.000, alpha: 1.000)

        //// Oval Drawing
        let ovalPath = UIBezierPath(ovalIn: CGRect(x: 0, y: 0, width: 50, height: 50))
        Assets.green.setFill()
        ovalPath.fill()


        //// Bezier Drawing
        let bezierPath = UIBezierPath()
        bezierPath.move(to: CGPoint(x: 38, y: 15))
        bezierPath.addLine(to: CGPoint(x: 22, y: 33))
        bezierPath.addLine(to: CGPoint(x: 12, y: 25))
        white.setStroke()
        bezierPath.lineWidth = 2
        bezierPath.lineCapStyle = .round
        bezierPath.lineJoinStyle = .round
        bezierPath.stroke()
 
        context.restoreGState()

    }

    @objc dynamic public class func drawFailfilled(frame targetFrame: CGRect = CGRect(x: 0, y: 0, width: 50, height: 50), resizing: ResizingBehavior = .aspectFit) {
        //// General Declarations
        let context = UIGraphicsGetCurrentContext()!
        
        //// Resize to Target Frame
        context.saveGState()
        let resizedFrame: CGRect = resizing.apply(rect: CGRect(x: 0, y: 0, width: 50, height: 50), target: targetFrame)
        context.translateBy(x: resizedFrame.minX, y: resizedFrame.minY)
        context.scaleBy(x: resizedFrame.width / 50, y: resizedFrame.height / 50)


        //// Color Declarations
        let white = UIColor(red: 1.000, green: 1.000, blue: 1.000, alpha: 1.000)

        //// Oval Drawing
        let ovalPath = UIBezierPath(ovalIn: CGRect(x: 0, y: 0, width: 50, height: 50))
        Assets.red.setFill()
        ovalPath.fill()


        //// Bezier Drawing
        let bezierPath = UIBezierPath()
        bezierPath.move(to: CGPoint(x: 16, y: 34))
        bezierPath.addLine(to: CGPoint(x: 25, y: 25))
        bezierPath.addLine(to: CGPoint(x: 34, y: 16))
        white.setStroke()
        bezierPath.lineWidth = 2
        bezierPath.lineCapStyle = .round
        bezierPath.stroke()


        //// Bezier 2 Drawing
        let bezier2Path = UIBezierPath()
        bezier2Path.move(to: CGPoint(x: 16, y: 16))
        bezier2Path.addLine(to: CGPoint(x: 25, y: 25))
        bezier2Path.addLine(to: CGPoint(x: 34, y: 34))
        white.setStroke()
        bezier2Path.lineWidth = 2
        bezier2Path.lineCapStyle = .round
        bezier2Path.stroke()
        
        context.restoreGState()

    }

    //// Generated Images

    @objc dynamic public class var imageOfFailfilled: UIImage {
        if Cache.imageOfFailfilled != nil {
            return Cache.imageOfFailfilled!
        }

        UIGraphicsBeginImageContextWithOptions(CGSize(width: 50, height: 50), false, 0)
            Assets.drawFailfilled()

        Cache.imageOfFailfilled = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()

        return Cache.imageOfFailfilled!
    }

    //// Customization Infrastructure

    @objc @IBOutlet dynamic var failfilledTargets: [AnyObject]! {
        get { return Cache.failfilledTargets }
        set {
            Cache.failfilledTargets = newValue
            for target: AnyObject in newValue {
                let _ = target.perform(NSSelectorFromString("setImage:"), with: Assets.imageOfFailfilled)
            }
        }
    }




    @objc(AssetsResizingBehavior)
    public enum ResizingBehavior: Int {
        case aspectFit /// The content is proportionally resized to fit into the target rectangle.
        case aspectFill /// The content is proportionally resized to completely fill the target rectangle.
        case stretch /// The content is stretched to match the entire target rectangle.
        case center /// The content is centered in the target rectangle, but it is NOT resized.

        public func apply(rect: CGRect, target: CGRect) -> CGRect {
            if rect == target || target == CGRect.zero {
                return rect
            }

            var scales = CGSize.zero
            scales.width = abs(target.width / rect.width)
            scales.height = abs(target.height / rect.height)

            switch self {
                case .aspectFit:
                    scales.width = min(scales.width, scales.height)
                    scales.height = scales.width
                case .aspectFill:
                    scales.width = max(scales.width, scales.height)
                    scales.height = scales.width
                case .stretch:
                    break
                case .center:
                    scales.width = 1
                    scales.height = 1
            }

            var result = rect.standardized
            result.size.width *= scales.width
            result.size.height *= scales.height
            result.origin.x = target.minX + (target.width - result.width) / 2
            result.origin.y = target.minY + (target.height - result.height) / 2
            return result
        }
    }
}

PaintCode.playground

import UIKit
import PlaygroundSupport

class MyViewController : UIViewController {
    override func loadView() {
        let view = UIView()
        view.backgroundColor = .white

        let label = UILabel()
        label.frame = CGRect(x: 150, y: 200, width: 200, height: 20)
        label.text = "Hello World!"
        label.textColor = .black
        view.addSubview(label)
        
        let star = UIImageView(image: paintImage(.star))
        let check = UIImageView(image: paintImage(.check))
        let fail = UIImageView(image: paintImage(.fail))
        
        let stack = UIStackView(frame: CGRect(x: 10, y: 300, width: 150, height: 50))
        stack.addArrangedSubview(star)
        stack.addArrangedSubview(check)
        stack.addArrangedSubview(fail)
        view.addSubview(stack)
        
        self.view = view
    }
    
    private enum Images {
        case star, check, fail
        func draw() {
            switch self {
            case .star: Assets.drawStarfilled()
            case .check: Assets.drawCheckfilled()
            case .fail: Assets.drawFailfilled()
            }
        }
    }
    
    private func paintImage(_ img: Images) -> UIImage {
        
        UIGraphicsBeginImageContext(CGSize(width: 50, height: 50))
        img.draw()
        let img = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return img ?? UIImage()
    }
}

PlaygroundPage.current.liveView = MyViewController()