Changing image of UIButton via click - Swift

Question

Im getting an error with this code.. What it should do: When user taps button, the image changes to checked, taps again, changes to Unchecked.

Im getting the error: AnyObject doesnt have member names 'setImage ...

 @IBAction func tick(sender: AnyObject) {
    if let image = UIImage(named:"Unchecked") {
        sender.setImage(UIImage(named:"Checked.png"), forControlState: .Normal)
    }
    if let image = UIImage(named:"Checked") {
        sender.setImage( UIImage(named:"Unchecked.png"), forControlState: .Normal)
    }
}

score 4 · Accepted Answer · answered Jul 08 '15 at 09:59

4

You only needs to change (sender:AnyObject) to (sender:UIButton) as below

@IBAction func tick(sender: UIButton) {
    if let image = UIImage(named:"Unchecked") {
        sender.setImage(UIImage(named:"Checked.png"), forControlState: .Normal)
    }
    if let image = UIImage(named:"Checked") {
        sender.setImage( UIImage(named:"Unchecked.png"), forControlState: .Normal)
    }
}

answered Jul 08 '15 at 09:59

Arslan Asim

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That worked. I also had to change forControlState to forState..whatever that mean.. anyways, thanks! – James Dithon Jul 08 '15 at 10:06

score 1 · Answer 2 · answered Jul 08 '15 at 09:53

You have to explicitly tell your compiler that sender is a UIButton and not AnyObject type.

    @IBAction func tick(sender: AnyObject) {
     if let button = sender as! UIbutton {
        if let image = UIImage(named:"Unchecked") {
            button.setImage(UIImage(named:"Checked.png"), forControlState: .Normal)
        }
        if let image = UIImage(named:"Checked") {
            button.setImage( UIImage(named:"Unchecked.png"), forControlState: .Normal)
        }
      } 
    }

score 1 · Answer 3 · answered Jul 08 '15 at 09:58

You can do it this way:

var checked = false

@IBAction func tick(sender: UIButton) {

    if checked {
        sender.setImage( UIImage(named:"Unchecked.png"), forState: .Normal)
        checked = false
    } else {
        sender.setImage(UIImage(named:"Checked.png"), forState: .Normal)
        checked = true
    }
}

Changing image of UIButton via click - Swift

3 Answers3