Cheatsheet

AppDelegate.swift

var window: UIWindow?
var navigationController: UINavigationController?
var mainViewController: UIViewController?


func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    window = UIWindow(frame: UIScreen.main.bounds)
    mainViewController = UIViewController()
    navigationController = UINavigationController(rootViewController: mainViewController!)
    window?.rootViewController = navigationController
    window?.makeKeyAndVisible()
    return true
}

HelperExtension.swift

extension UIColor {
  convenience init(red: Int, green: Int, blue: Int, a: CGFloat = 1.0) {
      self.init(
          red: CGFloat(red) / 255.0,
          green: CGFloat(green) / 255.0,
          blue: CGFloat(blue) / 255.0,
          alpha: a
      )
  }

  convenience init(rgb: Int, a: CGFloat = 1.0) {
      self.init(
          red: (rgb >> 16) & 0xFF,
          green: (rgb >> 8) & 0xFF,
          blue: rgb & 0xFF,
          a: a
      )
  }
}

StylingExtension.swift

extension UIButton {
  func applyRaisedStyle(){
    self.setTitleColor(UIColor.black, for: .normal)
    self.backgroundColor = UIColor.white
    self.layer.cornerRadius = 6
    self.layer.masksToBounds = false
    self.layer.shadowColor = UIColor.black.cgColor
    self.layer.shadowOffset = CGSize(width: 0, height: 0.08)
    self.layer.shadowOpacity = 0.075
    self.layer.shadowRadius = 5
    self.layer.shadowPath = UIBezierPath(rect: self.bounds).cgPath
  }
}