How can I get UIGestureRecognizer to work with manually added subviews - ios

Question

I programmatically made a subview and it shows up in my main view. It also has a separate view controller.
Though my gestureRecognizers work on UIImageViews in the main view, they do not work in my sub view.
Here's what I have in the main view controller:
var hVC: HandViewController = HandViewController()
override func viewDidLoad() {
super.viewDidLoad()
createHandImageView()
}
func createHandImageView() {
addChildViewController(hVC)
let w: CGFloat = cardWidth + ((hVC.maxHandCards-1) * hVC.handCardSep)
let h: CGFloat = cardHeight
let screenWidth = view.frame.size.width
let screenHeight = view.frame.size.height
let x: CGFloat = (screenWidth - w) / 2
let frame = CGRectMake(x, screenHeight - cardHeight - 20, w, h)
hVC.view = UIImageView(frame: frame)
hVC.view.backgroundColor = UIColor(white: 0, alpha: 0.3)
// This is where I add the Hand View that eventually holds the card views
view.addSubview(hVC.view)
hVC.didMoveToParentViewController(self)
}
And the sub view controller:
init() {
super.init(nibName: nil, bundle: nil)
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
override func viewDidLoad() {
super.viewDidLoad() // This NEVER fires
NSLog("did load");
}
func updateHandCardsView(cards: [Int]) {
handCardViews = [];
for card in cards {
addNewHandCardImage(card)
}
}
func addNewHandCardImage(card: Int) {
let imageView = UIImageView(frame:CGRectMake(0, 0, cardWidth, cardHeight));
imageView.image = UIImage(named: Deck.getCardName(card))
// This is where I add each Card View to the Hand View
self.view.addSubview(imageView)
handCardViews.append(imageView)
addEventRecognizers(imageView)
}
func addEventRecognizers(view: UIImageView) {
let singleTap = UITapGestureRecognizer(target: self, action: "highlightCard:")
singleTap.numberOfTapsRequired = 1
singleTap.numberOfTouchesRequired = 1
view.userInteractionEnabled = true
view.addGestureRecognizer(singleTap)
let doubleTap = UITapGestureRecognizer(target: self, action: "playCard:")
doubleTap.numberOfTapsRequired = 2
doubleTap.numberOfTouchesRequired = 1
view.userInteractionEnabled = true
view.addGestureRecognizer(doubleTap)
}
All the card views show up in the hand view. All programmatically created.
When I copy and paste the gesture code into the main view and use it on the cards on the table, the action gets called, but not in the sub view (HandView).
What am I missing?

Answer 1

Gesture recognizers only work on views that they belong to. There is a UIView method to add gesture recognizers. Your addEventRecognizers is only adding recognizers to whatever UIImageView passed in. You should change the function call to accept UIView, since UIImageView is just a subclass of UIView, it will still work on your images. Then call
addEventRecognizers(HandView) //Pass in the view that will get set with gesture recognizer.
Alternatively, if you just want to add one gesture recognizer just call HandView.addGestureRecognizer(gesture)