I am trying to create a custom UIView/Scrollview named MyScrollView that contains a few labels (UILabel), and these labels receive tap gestures/events in order to respond to user's selections 
.
In order to make the tap event work on the UILabels, I make sure they all have userIteractionEnabled = true and I created a delegate as below:
protocol MyScrollViewDelegate {
func labelClicked(recognizer: UITapGestureRecognizer)
}
The custom UIView is being used in ScrollViewController that I created, this ScrollViewController implements the delegate method as well:
import UIKit
import Neon
class ScrollViewController: UIViewController, MyScrollViewDelegate {
var curQuestion: IPQuestion?
var type: QuestionViewType?
var lastClickedLabelTag: Int = 0 //
init(type: QuestionViewType, question: IPQuestion) {
super.init(nibName: nil, bundle: nil)
self.curQuestion = question
self.type = type
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
self.automaticallyAdjustsScrollViewInsets = false
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func loadView() {
view = MyScrollView(delegate: self, q: curQuestion!)
view.userInteractionEnabled = true
}
}
// implementations for MyScrollViewDelegate
extension ScrollViewController {
func labelTitleArray() -> [String]? {
print("labelTitleArray called in implemented delegate")
return ["Comments", "Answers"]
}
func labelClicked(recognizer: UITapGestureRecognizer) {
print("labelClicked called in implemented delegate")
let controller = parentViewController as? ParentViewController
controller?.labelClicked(recognizer)
lastClickedLabelTag = recognizer.view!.tag
}
}
// MARK: - handle parent's ViewController event
extension QuestionDetailViewController {
func updateActiveLabelsColor(index: Int) {
print("updating active labels color: \(index)")
if let view = view as? MyScrollView {
for label in (view.titleScroll.subviews[0].subviews as? [UILabel])! {
if label.tag == index {
label.transform = CGAffineTransformMakeScale(1.1,1.1)
label.textColor = UIColor.purpleColor()
}
else {
label.transform = CGAffineTransformMakeScale(1,1)
label.textColor = UIColor.blackColor()
}
}
}
}
}
This above ScrollViewController is added, as a child view controller to the parent view controller, and positioned to the top part of the parent's view:
override func viewDidLoad() {
super.viewDidLoad()
self.automaticallyAdjustsScrollViewInsets = false
self.view.backgroundColor = UIColor.whiteColor()
addChildViewController(scrollViewController) // added as a child view controller here
view.addSubview(scrollViewController.view) // here .view is MyScrollView
scrollViewController.view.userInteractionEnabled = true
scrollViewController.view.anchorToEdge(.Top, padding: 0, width: view.frame.size.width, height: 100)
}
The app can load everything up in the view, but the tap gesture/events are not passed down to the labels in the custom MyScrollView. For this, I did some google search and have read Event Delivery: Responder Chain on Apple Developer website and did a hit test as well. The hitTest function below can be triggered in the MyScrollView:
override func hitTest(point: CGPoint, withEvent event: UIEvent?) -> UIView? {
print("hit test started, point: \(point), event: \(event)")
return self
}
My observations with the hitTest is that the touchesBegan() and touchesEnded() methods are triggered in the view only when the hitTest function is there. Without hitTest, both functions do not get called with taps.
but no luck getting the UILabel to respond to Tap Gestures. So I am reaching out to experts on SO here. Thanks for helping!
