DanielCardonaRojas

extension UIImage {
    static func fromInitials(_ string: String, size: CGSize, backGroundColor: UIColor, textAttributes: [NSAttributedString.Key: Any]? = nil) -> UIImage? {

        let text = string.initials
        let scale = Float(UIScreen.main.scale)
        UIGraphicsBeginImageContextWithOptions(size, false, CGFloat(scale))
        let context = UIGraphicsGetCurrentContext()
        context?.setFillColor(backGroundColor.cgColor)
        context?.fill(CGRect(x: 0, y: 0, width: size.width, height: size.height))

DanielCardonaRojas

func memoize<T: Hashable, U>(work: @escaping (T)->U) -> (T)->U {
    var memo = Dictionary<T, U>()
    
    return { x in
        if let q = memo[x] { return q }
        let r = work(x)
        memo[x] = r
        return r
    }
}

DanielCardonaRojas

extension Encodable {
    var asDictionary: [String: Any]? {
        guard let data = try? JSONEncoder().encode(self) else { return nil }
        return (try? JSONSerialization.jsonObject(with: data, options: .allowFragments)).flatMap { $0 as? [String: Any] }
    }
}

extension Decodable {
    static func fromDictionary(from json: Any) -> Self?  {
        guard let jsonData = try? JSONSerialization.data(withJSONObject: json, options: []) else {

DanielCardonaRojas

extension UIView {
      func allSubviews<T: UIView>(of type: T.Type) -> [T] {
        let directSubviews = subviews.compactMap({ $0 as? T })
        var nested = [T]()

        for s in subviews {
            let ss = s.allSubviews(of: type)
            nested += ss
        }

DanielCardonaRojas

struct Cached <V, C> {
    typealias Computation = (V) -> C
    private var computation: (V) -> C
    private var cachedResult: C?
    
    var value: V {
        willSet {
            cachedResult = nil
        }
    }

DanielCardonaRojas

extension UIView {
    func makeCircular() -> NSKeyValueObservation {
        self.layer.cornerRadius = self.bounds.width/2
        clipsToBounds = true
        let observation = observe(\UIView.bounds, changeHandler: { this, change in
            this.layer.cornerRadius = this.bounds.width/2
        })
        
        return observation
    }

DanielCardonaRojas

@IBDesignable
class RevealView: UIView {
    
    var contentHeight: CGFloat = 300
    
    @IBInspectable var title: String = "" {
        didSet {
            titleLabel.text = title
        }
    }

DanielCardonaRojas

extension UIScrollView {
    func scrollSubViewToTop(_ subview: UIView, offset: CGFloat, animated: Bool) {
        let point = convert(subview.frame.origin, from: subview.superview ?? subview)
        setContentOffset(CGPoint(x: 0, y: point.y - offset), animated: animated)
    }
    
    func viewPortOffset(of subview: UIView) -> CGFloat {
        let point = convert(subview.frame.origin, from: subview.superview ?? subview)
        return point.y - contentOffset.y
    }

DanielCardonaRojas

/*
 It is encouraged to use the same class name for the controller story board identifier,
 but this protocol is flexible to allow defining the story from where to instantiate the
 controller as well its identifier.
 
 
 You can choose to keep the convention while just changing the story board where the controller
 is located.
 e.g:
 

DanielCardonaRojas

import UIKit
import Foundation

protocol Coordinator: class {
    typealias ExitHandler = (Coordinator) -> Void
    var childCoordinators: [Coordinator] { get set }
    var navigationController: UINavigationController { get set }
    var initialViewController: UIViewController? { get }
    func willNavigate(from: UIViewController, to: UIViewController)
    func start()