GestureRecognizer in scrollView not working

Question

I moved all my UIElements in a scrollView to avoid a loaded UIViewcontroller. But now the GestureRecognizers on the view does not work anymore.

My View hierarchy looks like this:

• UIViewController (SingleEventController)
  • UIScrollView (EventScrollView)
    • UIView (contentView)
      • UILabel, UIView, UITableView, etc.

This looks like a common problem because I found quite much on Stackoverflow like: Example 1 Example 2. Still, I was not able to solve my case..

Simplified code in my EventScrollView looks like this:

let locationLabel: UILabel = {
    let label           = UILabel()
    label.text          = "Standort"
    label.isUserInteractionEnabled = true //Important!
    return label
}()

override init(frame: CGRect) {
    super.init(frame: frame)
    self.isUserInteractionEnabled = true //not needed!
    contentView.isUserInteractionEnabled = true //Important!
}

func setupViews() {
    guard let parent = parentVC else { return }
    let locationTap = UITapGestureRecognizer(target: parent, action: #selector(parent.openInGoogleMaps))
    locationTap.cancelsTouchesInView = false //Important!

    addSubview(contentView)
    contentView.addSubview(locationLabel)
    locationLabel.addGestureRecognizer(locationTap)
}

What step am I missing? Btw, clicks on a row of a UITableView inside the contentView don't get registered either.

Answer 1

I found my issue in the comments of this Answer. The contentView inside my scrollView which got all the other views in it, had 0 height and so-on it could not be clicked. By giving the view a height, it worked:

contentView.heightAnchor.constraint(equalTo: self.frameLayoutGuide.heightAnchor, multiplier: 1).isActive = true

Answer 2

In my case, I had a UIView (Content view) into a UIScrollView, this UIView had an UIStackView into itself and then differents UIView's (like buttons) embedded into UIStackView, every one component had a height property except content view (UIView), so setting height property based on child component (UIStackView) worked for me!

splitItAllMainView.heightAnchor.constraint(equalTo: self.splitItAllStackView.heightAnchor, multiplier: 1).isActive = true