Magic 8 Ball Tutorial in Swift

Magic8Ball.swift

// NOTE: This Magic 8 Ball Tutorial in Swift is for my personal reference
// teaching students at theCoderSchool in Flower Mound, TX
// This isn't a full blown application, just two swift files 
// combined into one github gist for reference when assisting
// students with their "Magic 8 Ball" assignment. This app consists
// of one view containing a label, a text field, and a button.
// Users enter their question into the text field and then press
// the button to submit their question. The app then answers the user
// using a simple UIAlertController (alert/dialog popup). Students
// need to connect the button from their main storyboard to the 
// ViewController using an IBAction. See the ViewController and Model
// swift files below:

//
//  ViewController.swift
//  Mystic 9 Ball
//
//  Created by Christopher Pedersen on 7/2/18.
//  Copyright © 2018 Christopher Pedersen. All rights reserved.
//

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        self.questionTextField.delegate = self
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    // Hide Keyboard Code by "The Swift Guy" and is from the public domain
    // REFERENCE: https://www.youtube.com/watch?v=l-Uup2lKw1Y
    
    // Hide Keyboard When User Touches The Screen
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.view.endEditing(true) // hide keyboard when user touches screen
    }
    
    // Hide Keyboard When User Presses Return Key on Keyboard
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        questionTextField.resignFirstResponder()
        return(true)
    }
    
    var mysticModel = MysticModel()
    
    func displayFortune(using fortune: String) {
        // REFERENCE (UIAlertViewController): https://developer.apple.com/documentation/uikit/uialertcontroller
        let alert = UIAlertController(title: "Mystic 9 Ball says...", message: fortune, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: "Default action"), style: .default, handler: { _ in
            NSLog("The \"OK\" alert occured.")
        }))
        self.present(alert, animated: true, completion: nil)
    }

    @IBOutlet weak var questionTextField: UITextField!
    
    @IBAction func onAskButtonClick(_ sender: Any) {
        let randomNumber = Int(arc4random_uniform(2))
        self.displayFortune(using: mysticModel.fortune[randomNumber])
        questionTextField.text = "" // clear text field so user can ask a new question
    }
}

//
//  MysticModel.swift
//  Mystic 9 Ball
//
//  Created by Christopher Pedersen on 7/2/18.
//  Copyright © 2018 Christopher Pedersen. All rights reserved.
//

import Foundation

class MysticModel {
    var fortune: [String] = []
    init() {
        fortune.append("Yes!")
        fortune.append("No.")
    }
}