Container view's collectionVC blocked with Parent's tapGesture recognizer - ios

Question

I have an extension of UIViewController as follows to dismiss the keyboard if the user taps on the screen. Within this view I have a scroll containing textfields and two container views. The container views contain a collectionView. I want my overall viewController to dismiss when tapped around but I still want my collectionView's didSelectitemAtIndexPath to trigger. How can I achieve this?
public extension UIViewController {
public func hideKeyboardWhenTappedAround() {
let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(UIViewController.dismissKeyboard))
view.addGestureRecognizer(tap)
}
public func dismissKeyboard() {
view.endEditing(true)
}
}
and
class RegisterVC: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
logViewLoad()
self.hideKeyboardWhenTappedAround()
let controller = self.storyboard?.instantiateViewController(withIdentifier: "CollectionViewSearchVC") as! CollectionViewSearchVC
controller.type = "SC"
addChildViewController(controller)
controller.view.translatesAutoresizingMaskIntoConstraints = false
controller.delegate = self
containerView.addSubview(controller.view)
NSLayoutConstraint.activate([
controller.view.leadingAnchor.constraint(equalTo: containerView.leadingAnchor),
controller.view.trailingAnchor.constraint(equalTo: containerView.trailingAnchor),
controller.view.topAnchor.constraint(equalTo: containerView.topAnchor),
controller.view.bottomAnchor.constraint(equalTo: containerView.bottomAnchor)
])
controller.didMove(toParentViewController: self)
subContractorVC = controller
let employeeController = self.storyboard?.instantiateViewController(withIdentifier: "CollectionViewSearchVC") as! CollectionViewSearchVC
employeeController.type = "V"
employeeController.delegate = self
addChildViewController(employeeController)
employeeController.view.translatesAutoresizingMaskIntoConstraints = false
employeeContainerView.addSubview(employeeController.view)
NSLayoutConstraint.activate([
employeeController.view.leadingAnchor.constraint(equalTo: employeeContainerView.leadingAnchor),
employeeController.view.trailingAnchor.constraint(equalTo: employeeContainerView.trailingAnchor),
employeeController.view.topAnchor.constraint(equalTo: employeeContainerView.topAnchor),
employeeController.view.bottomAnchor.constraint(equalTo: employeeContainerView.bottomAnchor)
])
employeeController.didMove(toParentViewController: self)
}

Answer 1

Implement the delegate methods for the GestureRecogniser in your ViewController and check for the class which is being touched, if that is of kind UICollectionView, then ignore that touch and let it do the default behaviour, i.e didSelect otherwise allow tap.
class ParentViewController: UIViewController {
var tap: UITapGestureRecognizer?
override func viewDidLoad() {
super.viewDidLoad()
tap = UITapGestureRecognizer(target: self, action: #selector(self.dismissKeyboard))
view.addGestureRecognizer(tap!)
}
public func hideKeyboardWhenTappedAround() {
dismissKeyboard()
}
#objc public func dismissKeyboard() {
view.endEditing(true)
}
}
class RegisterVC: ParentViewController, UIGestureRecognizerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
tap?.delegate = self
// YOUR EXISTING CODE HERE
}
// NEW CODE ADDED HERE
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
print("shouldReceive")
print(gestureRecognizer.view as Any) // CHECK FOR WHICH CLASS YOU ARE GETTING HERE WHEN YOU CLICK ON COLLECTIONVIEW
if (gestureRecognizer.view?.isKind(of: UICollectionView.self))! {
return false
}
return true
}
}
Try it and share the results.

Answer 2

You need to create a view behind the child VC's views and add the gesture to it