Making a randomizer picking words from text field (Swift)

Question

I'm trying to make app that takes info from the two text fields and randomly selects one of the sentences and places it in a label on another view controller. I'm a student in the Mobile Apps 1 class so I'm new to this. If you could explain it as much as possible it will be greatly appreciated. Happy new year!

My code:

class twoIdeasViewController: UIViewController {

    @IBOutlet weak var twoIdeaContinueButton: UIButton!
    @IBOutlet weak var twoIdea2TextField: UITextField!
    @IBOutlet weak var twoIdea1TextField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        self.title = "Enter Ideas"
    }

    func textFieldShouldReturn(textField: UITextField) -> Bool {
        let twoIdea1:String = twoIdea1TextField.text!
        let twoIdea2:String = twoIdea2TextField.text!
        return true
    }

    func prepareForSegue(segue: UIStoryboardSegue, Object: AnyObject?){
        let twoIdeaFinal = segue.destinationViewController as! twoFinalViewController
        twoIdeaFinal.twoIdea = //the variable that will contain the randomizer    
    }
}

Explain what you have tried and what is not working. Also, check the "Related" section to the right, for questions that are similar to yours. — fishinear, Jan 08 '16 at 15:55

score 1 · Answer 1 · edited May 23 '17 at 11:52

Make use of arc4random_uniform() to generate a random number that controls which of the two text fields you wish to extract and send text from. Also, you seem to need to fix up your prepateForSegue method: you need to match the segue identifier with the identifier of your 2nd view controller (set in attributes inspector while selecting this other view controller in your storyboard).

@IBOutlet weak var twoIdea2TextField: UITextField!
@IBOutlet weak var twoIdea1TextField: UITextField!

// ...

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    /* Get the new view controller using segue.destinationViewController.
       Pass the randomly chosen text view text to the UILabel of the
       new view controller. */

    /* Here: you need to match with the identifier of your
       VC 'twoFinalViewController' (set in attributes inspector) */
    if segue.identifier == "twoFinalVC" {
        let viewController = segue.destinationViewController as! ViewController

        let random = arc4random_uniform(2)
        viewController.twoFinalLabel.text = (random == 0) ? (twoIdea1TextField.text ?? "") : (twoIdea2TextField.text ?? "")
    }
}

For a detailed description covering segue communication between two view controllers (UITableViewController and UIViewController), see the following thread

Global variable and optional binding in Swift

text doesn't pop up in my label when I run it. It's something with my second viewcontroller probably : class twoFinalViewController: UIViewController { var twoIdea = String() @IBOutlet weak var twoFinalLabel: UILabel! override func viewDidLoad() { super.viewDidLoad() twoFinalLabel.text = "\(twoIdea)" } } — D Doe, Jan 08 '16 at 16:13
@DDoe Please add this additional code into your question, not these comments. — dfrib, Jan 08 '16 at 16:14
@DDoe see if the updated answer fixes it for you. Note that you need to match the `segue.identifier` with the corresponding identifier you've entered in the Attributes inspector for the target view controller. — dfrib, Jan 08 '16 at 16:23

score 0 · Answer 2 · answered Jan 08 '16 at 15:50

0

You can use something like that

func getRandomString() -> String
{
    let randomNumber = arc4random_uniform(2) + 1

    switch randomNumber
    {
        case 1:
            return twoIdea1TextField.text!
        case 2:
            return twoIdea2TextField.text!
        default:
            return ""
    }
}

I have no time, but I think that with an enum is simpler than what I did.

answered Jan 08 '16 at 15:50

Luca D'Alberti

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How would i send this through the segue? Do I send the function getRandomString through so it would be: twoIdeaFinal.twoIdea = getRandomString – D Doe Jan 08 '16 at 15:54
It should be 'twoIdeaFinal.twoIdea = self.getRandomString()' – Luca D'Alberti Jan 08 '16 at 15:55
The code works, but it the information doesn't appear in the label. The label is just blank, Is there something wrong with the second viewcontroller code? : class twoFinalViewController: UIViewController { @IBOutlet weak var twoFinalLabel: UILabel! override func viewDidLoad() { super.viewDidLoad() twoFinalLabel.text = "\(twoRandom)" } var twoRandom = String() } – D Doe Jan 08 '16 at 16:00
What's wrong is the way you are setting the label value. If you debug your code, into viewDidLoad you haven't yet the randomString... – Luca D'Alberti Jan 08 '16 at 16:01
What do I have to do to the label i set. @LucaD – D Doe Jan 08 '16 at 16:05
@dfri the text doesn't show still. The label just disappears when I run the app. – D Doe Jan 08 '16 at 16:10

Making a randomizer picking words from text field (Swift)

2 Answers2