UITapGesture doesn't work when I try to add it into a Custom UIView using Swift

Question

I use Xcode 15.1.

I create a CustomView to use in my project

class CustomView: UIView {

@IBOutlet weak var titleLabel: UILabel!
@IBOutlet weak var childView: UIView!
@IBOutlet weak var buttonView: UIView!

override init(frame: CGRect) {
    super.init(frame: frame)
    dprint("CustomView init frame")
    viewInit()
}

required init?(coder: NSCoder) {
    super.init(coder: coder)
    dprint("CustomView init coder")
    viewInit()
}

func viewInit() {
    let xibView = Bundle.main.loadNibNamed("CustomView", owner: self, options: nil)![0] as! UIView
    addSubview(xibView)
}

}

So, I try to call this custom view inside my UIVIewController using the code:

    let cv = CustomView()
    self.view.addSubview(cv)
    HelperXib.setCenteredXibContraints(cv, self.view)

struch HelperXib {
  static func setCenteredXibContraints(_ sameView:UIView, _ parentView: UIView) {
    // for errorView message that show on center, example: AlertNoPixKey
    sameView.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
        sameView.centerXAnchor.constraint(equalTo: parentView.centerXAnchor),
        sameView.centerYAnchor.constraint(equalTo: parentView.centerYAnchor),
    ])
  }
}
    

The view shows perfectly on my screen, then I try to use a code to use my one of my UIView(buttonView) inside the custom view to respond to tap events.

    let tap2 = UITapGestureRecognizer(target: self, action: #selector(ChargeEnterDataViewController.redirectToMyKeys(_:)) )
    cv.buttonView.addGestureRecognizer(tap2)
    cv.buttonView.isUserInteractionEnabled = true

Unfortunatley, there's no response when I click the buttonView UIView on my screen.

How can I make it work?

--- EDIT #1 ---

I find something strange. I try to use

print("cv.frame.size: \(cv.frame.size)")
print("cv.buttonView.frame.size: \(cv.buttonView.frame.size)")

it shows this on Xcode console

cv.frame.size: (0.0, 0.0)
cv.buttonView.frame.size: (240.0, 49.0)

For some reason the cv UIView is getting 0.0 for width and height. Don't know why this is happening. Maybe this could be the reason because the tapGesture is not working.

--- EDIT #2 ---

I use the code

let cv = CustomView()
cv.frame.size.width = UIScreen.main.bounds.width
cv.frame.size.height = UIScreen.main.bounds.height
cv.backgroundColor = .blue

My this is the result

I don't understand why there only my part my view that is being showed.

The is the CustomView in Xib

Answer 1

let cv = CustomView()
self.view.addSubview(cv)

So cv has no size. So all of its subviews are outside its bounds. So they can be seen but they cannot be touched; a view outside is superview's bounds fails hit testing by default.

To help with this, say cv.clipsToBounds = true. Now you won't even see its subviews until you fix the problem.