sashalondon

let font = UIFont.systemFontOfSize(17)

let mediumFont = UIFont.systemFontOfSize(17, weight: UIFontWeightMedium)
let lightFont = UIFont.systemFontOfSize(17, weight: UIFontWeightLight)
let boldFont = UIFont.systemFontOfSize(17, weight: UIFontWeightBold)
There is a ton of font weights to choose from:

UIFontWeightUltraLight
UIFontWeightThin

sashalondon

global.swift:

class Main {
  var name:String
  init(name:String) {
    self.name = name
  }
}
var mainInstance = Main(name:"My Global Class")
You can now access this mainInstance from all your view controllers and the name will always be "My Global Class". Example from a viewController:

sashalondon

//
//  ViewController.swift
//  multiplicationTable
//
//  Created by Sasha Akhavan-Zanjani on 06/05/2015.
//  Copyright (c) 2015 Sasha Akhavan-Zanjani. All rights reserved.
//

import UIKit

sashalondon

//
//  ViewController.swift
//  My Stuff App
//
//  Created by Sasha Zanjani on 31/03/2015.
//  Copyright (c) 2015 Sasha Zanjani. All rights reserved.
//

import UIKit
import MobileCoreServices

sashalondon

//
//  ViewController.swift
//  Word Magnet game
//
//  Created by Sasha Akhavan-Zanjani on 28/02/2015.
//  Copyright (c) 2015 Sasha Akhavan-Zanjani. All rights reserved.
//

import UIKit