斯威夫特：为什么我的-1按钮无法正常工作？

Question

I have a +1 button and a -1 button and a label that starts at 0. My +1 button is working great, but for some reason, my -1 button isn't working. Can anyone help?

var sales = 0

@IBOutlet weak var numberOfSalesLabel: UILabel!
@IBOutlet weak var minusOneSaleOutlet: UIButton!

@IBAction func plusOneSale(sender: AnyObject) {
    sales += 1
    numberOfSalesLabel.text = "\(sales)"
    if sales >= 1 {
        minusOneSaleOutlet.hidden = false
       }
}

override func viewDidLoad() {
}

@IBAction func minusOneSale(sender: AnyObject) {
    sales -= 1
    numberOfSalesLabel.text = "\(sales)"

    if sales == 0 {
        minusOneSaleOutlet.hidden = true
    }
}

Anybody got any ideas why my minus button isn't working? I'm thinking it might have to do with me calling it as an outlet and as an action, but I'm not sure. Thanks!

ps-I'm not sure if this is normal.

Answer 1

Using the connections inspector you'll need to make sure all the connections are correct.

If at any point you delete an @IBAction from your code, then create another connection, the old one will still remain until you remove it properly from the connection inspector.

Each of your buttons should only be connected to a single @IBAction (touchUpInside)

Below is what the connections inspector looks like. The image is from one of my own projects, and shows a connected delegate. So yours will look a bit different.

If all else fails, remove all connections on this view (click the x) and link them up again by Ctrl dragging from your button, into the code viewer right on top of your @IBAction. Sometimes its just easier to start again.