Change the color of UIButton in IBOutletCollection

Question

I have an IBOutletCollection of UIButton:

@IBOutlet var buttons: [UIButton]!

and a function for a tap:

@IBAction func butto         


        

Answer 1

Try this code:

@IBOutlet var buttons: [UIButton]!
var lastTappedButton: UIButton?

@IBAction func button_Tap(_ sender: UIButton) {

    for button in buttons {
        if let lastTappedButton = lastTappedButton, lastTappedButton != sender {
            button.backgroundColor = .white
        }
        if button.tag == sender.tag { 
            button.backgroundColor = .blue 
            lastTappedButton = button
        }
    }
}

Answer 2

For this to work

1- All buttons should be connected to

 @IBOutlet var buttons: [UIButton]!

2- All buttons should be connected to

@IBAction func button_Tap(_ sender: UIButton) 

3- Every button should have a different tag for example 0,1,2

4- You can use this

@IBAction func button_Tap(_ sender: UIButton) {
  self.buttons.forEach { $0.backgroundColor = $0 === sender ? .blue : .white  }
}

Result