Selecting and deselecting collection of buttons - ios

Question

I have three buttons named One, Two, and Three, and a function buttonPressed for collection of those three buttons as follows.
var btnTag = [Int]()
#IBAction func buttonPressed(_ sender: UIButton) {
guard let button = sender as UIButton? else { return }
if(btnTag.contains((sender as AnyObject).tag!))
{
if let index = btnTag.index(of: (sender as AnyObject).tag!)
{
btnTag.remove(at: index)
}
}
else
{
btnTag.append((sender as AnyObject).tag!)
}
if !button.isSelected {
button.isSelected = true
button.setTitleColor(.red, for: .normal)
}
else
{
button.isSelected = false
button.setTitleColor(.white, for: .normal)
}
}
I like to change color of button as red when clicked and then when I click other button the previous button color as white. So if I press One, I want One to be red and then when I pres Two, I want Two to be red and One as white. I did the above but it is allowing multiple selection and not able to deselect previous changes. How do I solve this?

Answer 1

You can simply create collection of UIButton. After that assign tag of all three UIButton from Storyboard.
#IBOutlet var buttons: [UIButton]!
Use above collection and connect all the button with Outlet. also connect below action with all buttons.
#IBAction func buttonPressed(_ sender: UIButton) {
buttons.forEach { $0.isSelected = false
$0.setTitleColor(.white, for: .normal)
}
buttons[sender.tag].setTitleColor(.red, for: .normal)
buttons[sender.tag].isSelected = true
}

Answer 2

Since you are highlighting only one button at the moment, you don't need tag array instead the reference to all buttons.
//Let say these are my button refrence
#IBOutlet weak var button1: UIButton!
#IBOutlet weak var button2: UIButton!
#IBOutlet weak var button3: UIButton!
All of those buttons are targeting same method
#IBAction func buttonPressed(_ sender: UIButton) {
//clear all button selected state
clearSelectedState()
//select the button that was clicked
sender.isSelected = true
sender.setTitleColor(.red, for: .normal)
}
func clearSelectedState() {
button1.isSelected = false
button1.setTitleColor(.white, for: .normal)
.... proceed to do for others
}
Now in clearSelectedState method I don't like the repetition of code. So what we can do is put the reference in array and do something like
///this can be replaced in clear state method
[button1, button2, button3,...].forEach {
$0.isSelected = false
$0.setTitleColor(.white, for: .normal)
}