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iOS Build a Simple iPhone App with Swift Improving Our User Interface Adapting Our Content

Matt George
Matt George
2,507 Points
Posted by Matt George
Matt George
2,507 Points

Trying to make a COIN TOSS app but my code isn't working! Please help?!

import UIKit

class ViewController: UIViewController {

struct Formula {
    let tossArray = ["Heads","Tails"]


    func probability() -> String {
        let unsignedTossArray = UInt32(tossArray.count)
        let unsignedRandomNumber = arc4random_uniform(unsignedTossArray)
        var randomProbaility = Int(unsignedRandomNumber)

        return tossArray[randomProbaility]
    }
}

let formula = Formula()

@IBOutlet weak var tossAnswer: UILabel!

  override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    tossAnswer.text = "Heads or Tails?"
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
@IBAction func headsOrTails(sender: AnyObject) {
    tossAnswer.text = formula.probability()      
}

}

1 Answer

Sam Chaudry
Sam Chaudry
25,519 Points
Sam Chaudry
Sam Chaudry
25,519 Points

Hi Matt I've had a quick rebuild of the coin toss app and got a working version. I've added my code below and annotated at the top so you can see how I have done it.

//1. Create model Swift file in my case I've called it Coin.swift

//2. Add Coin Struct and it's values struct CoinResults {

let tossArray = ["Heads","Tails"];

func tossTheCoin()->String{

    let unsignedTossArray = UInt32(tossArray.count)
    let unsignedRandomNumber = arc4random_uniform(unsignedTossArray)
    var randomProbaility = Int(unsignedRandomNumber)

    return tossArray[randomProbaility]

}

//3. Go into viewcontroller

class ViewController: UIViewController {

//Create your results label @IBOutlet weak var results: UILabel!

//Create your button @IBAction func CoinToss(sender: AnyObject) {

//Call the Swift Struct CoinResults

    let Coins = CoinResults();

//Set the properties of your results text label to call the struct's tossTheCoin method ad this will return heads or tails
results.text = Coins.tossTheCoin();

}


override func viewDidLoad() {

    super.viewDidLoad()

}

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

}

I hope this helps.

Sam