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iOS Build a Simple iPhone App with Swift Creating a Data Model Finishing Up Our Model

Mateo Sossah
Mateo Sossah
6,598 Points
Posted by Mateo Sossah
Mateo Sossah
6,598 Points

How to use showFunFact to display the quotes from the factsArray in the index order?

I'd like to not have the quote picked randomly, but displayed in the order of Index. viewDidLoad = 0 first click = 1 second click = 2 ...etc

If anyone could help me with that it would be awesome!!!

2 Answers

Damien Watson
Damien Watson
27,419 Points
Damien Watson
Damien Watson
27,419 Points

Hi, I'm not quite up on swift as objc, but you are on the right path. Set a variable to track the current Fact (starting at 0), then increment it. When greater than or equal to the array amount, set back to 0.

This is how I achieved it in swift (note: I am accessing the factsArray directly):

class ViewController: UIViewController {
    @IBOutlet weak var funFactLabel: UILabel!
    @IBOutlet weak var funFactButton: UIButton!

    var factBook = FactBook()
    let colourWheel = ColourWheel()
    // Define the fact pointer
    var currentFact = 0

    override func viewDidLoad() {
        super.viewDidLoad()
        // Set the fact
        funFactLabel.text = factBook.factsArray[currentFact]
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    @IBAction func showFactButton() {
        // Loop the fact pointer
        if ++currentFact >= factBook.factsArray.count {
            currentFact = 0
        }
        // Set the fact
        funFactLabel.text = factBook.factsArray[currentFact]
        let randomColour = colourWheel.randomColour()
        view.backgroundColor = randomColour
        funFactButton.tintColor = randomColour
    }

}
Mateo Sossah
Mateo Sossah
6,598 Points
Mateo Sossah
Mateo Sossah
6,598 Points

Thanks!

Here is what I got with swift, starting from your answer, but I get an error message about the "if var" statement = "variable binding in a condition requires an initializer". Do you know what's the issue?

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var funFactLabel: UILabel!

let factBook = FactBook()
var arrayIndex = 0

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

// funFactLabel.text = factBook.randomFact() funFactLabel.text = factBook.factsArray[arrayIndex] }

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

    @IBAction func showFunFact() {
        if var ++arrayIndex >= factBook.factsArray.count{
            arrayIndex = 0
        } else {
         print(funFactLabel.text = factBook.factsArray[arrayIndex])
    }
}

}

Damien Watson
Damien Watson
27,419 Points
Damien Watson
Damien Watson
27,419 Points

Hi Mateo,

Looks like the lines are a bit mashed up, I have taken your 'showFunFact' method and cleaned it up below. You had the 'var' in the if statement it is already assigned, so you don't need this. Also you had an 'else' which is not required as the arrayIndex gets set back to 0 (first item), it will just continue to loop.

@IBAction func showFunFact() {
        if ++arrayIndex >= factBook.factsArray.count{
            arrayIndex = 0
        }
        print(funFactLabel.text = factBook.factsArray[arrayIndex])
}