Swift: Adding Taps to Custom Views - ios

Question

I would like to add taps to views which subclasses another view, but my current approach does not get invoked, ie the seatNumber does not get printed when my seats are tapped as coded in the handleTap function. I have adapted my approach from the following this post and this. My code thus far:
//My viewController
class ViewController: UIViewController, UIScrollViewDelegate {
let scrollView = UIScrollView()
let cinema: CinemaView = {
let v = CinemaView()
return v
}()
override func viewDidLoad() {
super.viewDidLoad()
let seat1 = SeatView()
seat1.isVacant = false
seat1.seatNumber = "2A"
let seat2 = SeatView()
seat2.isVacant = true
seat2.seatNumber = "3B"
cinema.seats = [seat1, seat2]
let tap = UITapGestureRecognizer(target: seat1, action: #selector(handleTap))
seat1.addGestureRecognizer(tap)
seat1.isUserInteractionEnabled = true
view.addSubview(scrollView)
scrollView.addSubview(cinema)
}
#objc func handleTap(_ seat: SeatView) {
if let seatNumber = seat.seatNumber {
print("\(seatNumber) is tapped")
} else {
print("Seat tapped")
}
}
//My custom cinemaView
class CinemaView: UIView {
var seats = [SeatView]() {
didSet {
for v in self.subviews {
v.removeFromSuperview()
}
var seatRect = CGRect(x: 0, y: 0, width: 20, height: 20)
for seat in seats {
self.addSubview(seat)
seat.frame = seatRect
seatRect.origin.x += seatRect.size.width + 8
}
}
}
override init(frame: CGRect) {
super.init(frame: frame)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
//My Custom seatView
class SeatView: UIView {
var isVacant: Bool = true
var seatNumber: String?
override init(frame: CGRect) {
super.init(frame: frame)
}
}
Note: some boilerplate codes have been omitted above to keep the code concise for this question.
My preferred approach is to add these taps inside the VC so that I can pass this info into another VC and push up to Firebase. Any advice would be much appreciated
EDIT: Added screenshot of UI

Answer 1

With the help of 3stud1ant3, I managed to figure out where went wrong.
After observing the view layout, the cinemaView was never added to the view even though the seatViews were added. By defining more constraints to cinemaView in viewDidLoad at the viewController and incorporating 3stud1ant3's code in the below answer post, the tap functions worked.
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .blue
cinema.seats = [seatView1, seatView2]
view.addSubview(scrollView)
scrollView.addSubview(cinema)
let views = ["scrollView": scrollView, "v": cinema] as [String : Any]
let screenHeight = view.frame.height
view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[scrollView(\(screenHeight / 2))]", options: NSLayoutFormatOptions(), metrics: nil, views: views))
view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[scrollView]|", options: NSLayoutFormatOptions(), metrics: nil, views: views))
view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-60-[v(50)]", options: NSLayoutFormatOptions(), metrics: nil, views: views))
//Previously, the below constraints were not added. Once these are added, the tap function works
cinema.leftAnchor.constraint(equalTo: scrollView.leftAnchor).isActive = true
cinema.topAnchor.constraint(equalTo: scrollView.topAnchor).isActive = true
cinema.widthAnchor.constraint(equalTo: scrollView.widthAnchor ,constant: 100).isActive = true
}