UITapGestureRecognizer not attaching action

Question

I created a separate class for View. I left all the functions in the Controller. But when I add a click on the picture, it doesn't work for some reason.

import UIKit

class APOTDView: UIView {

    var imageView: UIImageView = {
        let imageView = UIImageView()
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.isUserInteractionEnabled = true
        let tap = UITapGestureRecognizer(target: self, action: #selector(APOTDViewController.imageTapped(_:)))
        imageView.addGestureRecognizer(tap)

        return imageView
    }()
}

import UIKit

class APOTDViewController: UIViewController {

    let av = APOTDView()

    override func viewDidLoad() {
        super.viewDidLoad()
        // ... add subview and constraint
    }

    @objc func imageTapped(_ sender: UITapGestureRecognizer) {
        print("good job")
    }
}

What's the matter? Please help me figure it out

Answer 1

Your selector in the UITapGestureRecognizer is wrong. You can not call the APOTDViewController directly.
APOTDViewController.imageTapped would be a static function, which is not available.

You can use a delegate instead.

Delegate Protocol and View.

protocol APOTDViewDelegate: AnyObject {
    func viewDidTapImage()
}

class APOTDView: UIView {
    weak var delegate: APOTDViewDelegate?

    var imageView: UIImageView = {
        let imageView = UIImageView()
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.isUserInteractionEnabled = true
        let tap = UITapGestureRecognizer(target: self, action: #selector(imageTapped))
        imageView.addGestureRecognizer(tap)

        return imageView
    }()

    @objc func imageTapped() {
        delegate?.viewDidTapImage()
    }
}

ViewController:

class APOTDViewController: UIViewController, APOTDViewDelegate {
    let av = APOTDView()

    override func viewDidLoad() {
        super.viewDidLoad()
        av.delegate = self
        // ... add subview and constraint
    }

    @objc func viewDidTapImage() {
        print("good job")
    }
}