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iOS

Posted by Chris Wade
Chris Wade
9,574 Points

How to get colours to match in Build a Simple iOS app.

Im in the final stages of the build a simple iOS app using swift and I'm having trouble with getting my button to match the color of my background every time the fact changes.

import UIKit

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

let factBook = FactBook()
let colorWheel = ColorWheel()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    funFactLabel.text = factBook.randomFact()
}

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


@IBAction func showFunFact() {
    let randomColor = colorWheel.randomColor()

    view.backgroundColor = randomColor // <---this line has a warning Variable 'randomColor' was never mutated, consider changing to let.

    funFactButton.tintColor = randomColor
    funFactLabel.text = factBook.randomFact()
    }
}
Steven Deutsch
Steven Deutsch
21,046 Points

Hey Chris Wade,

Could you please post the code in your ColorWheel.swift file?

Thanks

1 Answer

Chris Wade
Chris Wade
9,574 Points
Chris Wade
Chris Wade
9,574 Points

import Foundation import UIKit

struct ColorWheel {

let colorsArray = [
    UIColor(red: 90/255.0, green: 187/255.0, blue: 181/255.0, alpha: 1.0), //teal color
    UIColor(red: 222/255.0, green: 171/255.0, blue: 66/255.0, alpha: 1.0), //yellow color
    UIColor(red: 223/255.0, green: 86/255.0, blue: 94/255.0, alpha: 1.0), //red color
    UIColor(red: 239/255.0, green: 130/255.0, blue: 100/255.0, alpha: 1.0), //orange color
    UIColor(red: 77/255.0, green: 75/255.0, blue: 82/255.0, alpha: 1.0), //dark color
    UIColor(red: 105/255.0, green: 94/255.0, blue: 133/255.0, alpha: 1.0), //purple color
    UIColor(red: 85/255.0, green: 176/255.0, blue: 112/255.0, alpha: 1.0), //green color
]

func randomColor() -> UIColor {
    var unsignedArrayCount = UInt32(colorsArray.count)
    var unsignedRandomNumber = arc4random_uniform(unsignedArrayCount)
    var randomNumber = Int(unsignedRandomNumber)

    return colorsArray[randomNumber]

}

}

Steven Deutsch
Steven Deutsch
21,046 Points

Everything looks fine here. Is everything else working properly in the app? It's making me crazy because I'd really like to solve this for you! I know it's not really the best solution but have you tried re-creating that IBAction?