Adding double tap gesture recognizer to UIImageView in an UITableViewCell Swift 4+ - ios

Question

(Edited with working solution)
So I'm trying to add a double tap gesture to an UIImageView I created in a custom UITableViewCell but can't seem to get it working.
Here is my custom UITableViewCell:
protocol CustomCellDelegate: class {
func didTapImage()
}
class CustomCell: UITableViewCell {
//change let to lazy var
lazy var userImage: UIImageView = {
let newView = UIIMageView()
newView.layer.cornerRadius = 24
newView.layer.masksToBounds = true
newView.image = UIImage(named: "samplePic")
newView.contentMode = .scaleAspectFill
newView.isUserInteractionEnabled = true
let doubleTap = UITapGestureRecognizer(target: self, action: #selector(myFunc))
doubleTap.numberOfTouchesRequired = 1
doubleTap.numberOfTapsRequired = 2
newView.addGestureRecognizer(doubleTap)
newView.translatesAutoresizingMaskIntoConstraints = false
return newView
}
weak var delegate: CustomCellDelegate?
#objc func myFunc() {
delegate?.didTapImage()
}
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: .subTitle, reuseIdentifier: reuseIdentifier)
self.selectionStyle = .none
//changed addSubView(userImage) to self.contentView.addSubView(userImage)
self.contentView.addSubView(userImage)
NSLayoutConstraint.activate([
userImage.centerYAnchor.constraint(equalTo: self.centerYAnchor),
userImage.leftAnchor.constraint(equalTo: self.leftAnchor),
userImage.widthAnchor.constraint(equalToConstant: 48),
userImage.heightAnchor.constraint(equalToConstant: 48),
}
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
Here is my custom UITableViewController:
class customTableViewController: UITableViewController, CustomCellDelegate {
fileprivate let cellId = "cellId"
func didTapImage() {
print("Tapped Image")
}
override func viewDidLoad() {
super.viewDidLoad()
tableView.register(CustomCell.self, forCellReuseIdentifier: cellId)
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 5
}
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 72
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath) as! CustomCell
cell.delegate = self
return cell
}
}
Any ideas as to why this isn't working? What am I doing wrong? Also how do I avoid having the same tap gestures recognizer added multiple times as cells are dequeue?

Answer 1

You may need
userImage.translatesAutoresizingMaskIntoConstraints = false
as you create constraints programmatically
lazy var userImage: UIImageView = {
let newView = UIIMageView()
userImage.translatesAutoresizingMaskIntoConstraints = false
newView.layer.cornerRadius = 24
newView.layer.masksToBounds = true
newView.image = UIImage(named: "samplePic")
newView.contentMode = .scaleAspectFill
newView.isUserInteractionEnabled = true
let doubleTap = UITapGestureRecognizer(target: self, action: #selector(myFunc))
doubleTap.numberOfTouchesRequired = 1
doubleTap.numberOfTapsRequired = 2
newView.addGestureRecognizer(doubleTap)
return newView
}()
also make it a lazy var not a computed property for being 1 instance every access , add the imageView to
self.contentView.addSubView(userImage)
and set the constraints with it