Disable button2 if button1 is not clicked - ios

Question

I want to disable the button2 if button1 is not clicked, and enable it when button1 is clicked. The problem is, the button2 is disable even I already clicked the button1. I don't receive any error, I'm using Swift4 in Xcode10.
Here is my code:
class ViewController: UIViewController {
#IBOutlet weak var btn1: UIButton!
#IBOutlet weak var btn2: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
intro()
btn1.setImage(UIImage(named: "checked.png"), for: .selected)
btn1.setImage(UIImage(named: "unchecked.png"), for: .normal)
}
#IBAction func button1(_ sender: UIButton) {
UIView.animate(withDuration: 0.5, delay: 0.1, options: .curveLinear, animations: {
sender.transform = CGAffineTransform(scaleX: 0.1, y: 0.1)
}) { (success) in
UIView.animate(withDuration: 0.5, delay: 0.1, options: .curveLinear, animations: {
sender.isSelected = !sender.isSelected
sender.transform = .identity
}, completion: nil)
}
}
func intro() {
if btn1.isSelected == true {
btn2.isUserInteractionEnabled = true
} else {
btn2.isUserInteractionEnabled = false
}
}
}
I also tried this code:
func intro() {
if btn1.isTouchInside == true {
btn2.isUserInteractionEnabled = true
} else {
btn2.isUserInteractionEnabled = false
}
}

Answer 1

I think first you want button2 is disable and when you click on the button1 its should be enable.
For this make
override func viewDidLoad() {
super.viewDidLoad()
btn1.setImage(UIImage(named: "checked.png"), for: .selected)
btn1.setImage(UIImage(named: "unchecked.png"), for: .normal)
btn2.isenable = false
}
#IBAction func button1(_ sender: UIButton) {
if sender.isSelected == true
{
btn2.isenable = true
}
else
{
btn2.isenable = false
}
}

Answer 2

Add any of the below code in your viewDidLoad()
btn2.isEnabled = false
or
btn2.isUserInteractionEnabled = false
and change your button action as,
#IBAction func button1(_ sender: UIButton) {
if btn1.isSelected == true {
btn2.isUserInteractionEnabled = true
} else {
btn2.isUserInteractionEnabled = false
}
}