iOS Programming: The Big Nerd Ranch Guide

Creating the Model Layer

View objects make up the user interface, so developers typically create, configure, and connect view objects using Interface Builder. The parts of the model layer, on the other hand, are typically set up in code.

In the project navigator, select ViewController.swift. Add the following code that declares two arrays of strings and an integer.

class ViewController: UIViewController {

    @IBOutlet var questionLabel: UILabel!
    @IBOutlet var answerLabel: UILabel!

    let questions: [String] = ["From what is cognac made?",
                               "What is 7+7?",
                               "What is the capital of Vermont?"]
    let answers: [String] = ["Grapes",
                            "14",
                            "Montpelier"]
    var currentQuestionIndex: Int = 0

    ...
}

The arrays will be ordered lists containing questions ...