missing return in a function expected to return swift

Question

I want to make a button that makes the background switch between red and green but I get this error:

missing return in a function expected to return UIView

I'm pretty new to coding, I've googled a bit but I didn't find anything.

Language:Swift

my code:

var timeLeft = 0
import UIKit

class ViewController: UIViewController {

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

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

    var buttonColor: UIView! {

        timeLeft = 1
    }

    func update() {
        if timeLeft > 0 {
            view.backgroundColor = UIColor.greenColor()
        }
        else {

            view.backgroundColor = UIColor.redColor()
        }
        timeLeft = timeLeft - 1

    }
}

thanks for helping

see the question here: stackoverflow.com/questions/24689469/… — Teja Nandamuri
– Teja Nandamuri, Commented Feb 23, 2015 at 13:47

giorashc · Accepted Answer · 2015-02-23 13:54:35Z

2

You declare buttonColor as a computed property which in its body requires you to return a UIView instance (since its type is UIView).

Read here or here about computed property and make sure it fits your needs as posted in your case

answered Feb 23, 2015 at 13:54

giorashc

13.7k3 gold badges38 silver badges76 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Nikolaj · Accepted Answer · 2015-02-23 14:07:00Z

0

Hi and welcome to stackoverflow

Remember to make an action connecting your UIButton to the code. Otherwise your code will not run when you click on the button. Also, consider using a Bool (true/false) variable to keep track of the background color.

Try the following code (remember to connect the 'click'-function to the button via the storyboard):

import UIKit

class ViewController: UIViewController {

    var isGreen = true

    @IBAction func click() {
        if isGreen {
            view.backgroundColor = UIColor.redColor()
            isGreen = false
        } else {
            view.backgroundColor = UIColor.greenColor()
            isGreen = true
        }
    }
}

answered Feb 23, 2015 at 14:07

Nikolaj

3842 silver badges8 bronze badges

Comments

Loganathan · Accepted Answer · 2015-02-23 14:18:17Z

0

var buttonColor: UIView! { get() { return (Object of UIView) } }

answered Feb 23, 2015 at 14:18

Loganathan

1,7971 gold badge13 silver badges17 bronze badges

Collectives™ on Stack Overflow

missing return in a function expected to return swift

3 Answers 3

Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related