dealornodeal.swift

import UIKit
import PlaygroundSupport

let vc = UIViewController()
vc.view.backgroundColor = .white
PlaygroundPage.current.liveView = vc
PlaygroundPage.current.needsIndefiniteExecution = true

let button = UIButton(type: .system)
button.frame = CGRect(x: 0, y: 0, width: 240, height: 120)
button.setTitle("Push Me", for: .normal)
button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 32)

vc.view.addSubview(button)
button.center = vc.view.center

let label = UILabel(frame: CGRect(x: 0, y:0, width:200, height: 30))
label.center = CGPoint(x: button.center.x, y: button.center.y + 60)
label.text = "What will you win?"
label.textAlignment = .center

vc.view.addSubview(label)

extension UIViewController {
    func go() {
        let roll = arc4random_uniform(100)
        switch roll {
        case 0 ..< 60: label.text = "You won a penny"
        case 60 ..< 80: label.text = "You won two pennies"
        case 80 ..< 90: label.text = "You won a nickel"
        case 90 ..< 97: label.text = "You won a dime"
        default: label.text = "You won a quarter"
        }
    }
}

button.addTarget(vc, action: #selector(UIViewController.go), for: .touchUpInside)