First app

FunFacts.swift

//
//  FactProvider.swift
//  fun facts
//
//

import Foundation

struct FactProvider {
  let facts: [String] = ["this is awesome", "woot", "woot woot", "wooting is rough"]
  
    func randomFact() -> String {
      let factPosition = arc4random_uniform(UInt32(facts.count))
      return facts[Int(factPosition)]
    }
}

RandomColorGenerator.swift

//
//  RandomColorGenerator.swift
//  fun facts
//
//

import UIKit


func randomColor() -> UIColor {
  let red   = randomNumber()
  let green = randomNumber()
  let blue  = randomNumber()
  

  let color = UIColor(colorLiteralRed: red/255, green: green/255, blue: blue/255, alpha: 1)
  
  return color
}


func randomNumber() -> Float {
  let number =  Float(arc4random_uniform(255))
  return number
}

ViewController.swift

//
//  ViewController.swift
//  fun facts
//
//

import UIKit

class ViewController: UIViewController {
 
  @IBOutlet weak var factLbl: UILabel! {
    didSet {
      factLbl.textColor = UIColor.white
    }
  }
  
  @IBOutlet weak var factBtn: UIButton! {
    didSet {
      factBtn.setTitle("Hello", for: .normal)
      factBtn.setTitleColor(.white, for: .normal)
    }
  }
  
  let fact = FactProvider()
  override func viewDidLoad() {
    super.viewDidLoad()
    view.backgroundColor = randomColor()
    factLbl.text = "Some interesting facts"
    
  }

  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
  }
  
  @IBAction func factBtn(_ sender: UIButton) {
    factLbl.text = fact.randomFact()
    view.backgroundColor =  randomColor()
  }

}