UISwipeGestureRecognizer and CollectionView scroll to next item indexPath - ios

Question

So I have a collection view of cards, and what I want is when I swipe left I want the next item to be centered in the middle, this doesn't work with paging enabled
So when I swipe left I want the next card to be centered, this doesn't work with the normal behaviour because I just want to swipe one card.
So I have added UISwipeGestureRecognizer and disabled scrolling on the collection view
class ViewController: UIViewController,UICollectionViewDataSource {
#IBOutlet var joke_cards: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad();
//Add gestures
let leftSwipeGest = UISwipeGestureRecognizer(target: self, action: #selector(funcForGesture))
leftSwipeGest.direction = .left
joke_cards.addGestureRecognizer(leftSwipeGest)
}
func funcForGesture(sender: UISwipeGestureRecognizer){
if sender.direction == .left {
//scroll to next item
}
}
Now my problem is how can I scroll to the next item? since I don't know the indexPath? because if I want to use this self.joke_cards.scrollToItem(at: indexPath, at: .centeredHorizontally, animated: true), I will need the index path, so I think I need to figure out the current indexPath on the view and add one when the user swipes.
Any suggestions?
//updated
So I have managed to get it to work, but it only works when I swipe the first time:
func funcForGesture(sender: UISwipeGestureRecognizer){
if sender.direction == .left {
//scroll to next item
let cellItems = self.joke_cards.indexPathsForVisibleItems
let next = cellItems[0] as! IndexPath
self.joke_cards.scrollToItem(at: next, at: .centeredHorizontally, animated: true)
}
}

Answer 1

One solution:
1: Add an NSIndexPath property to your cells and just set the indexPath to the property in your cellForItem method.
2: Get an array of visible cells.
3: Get the rect of the visible cells and calculate their position on the screen and you can allso get the correct indexPath from the cell property.
Second solution:
1: Add a UILongPressGestureRecognizer to your cell contentView
2: Set minimumPressDuration to 0.
3: Add delegate methods to fire acitons or this.
Third solution:
1: Keep your swipe gesture.
2: And use this method (same as option 2) indexPathForItemAtPoint:

Answer 2

Why are you saying that this does not work with paging enabled? This should actually be the best way to do it in my opinion. You can just make the width of the UICollectionViewCells to be equal to the width of the UICollectionView, set the scroll direction to be horizontal and enable paging, that should do the trick.
In this way you won't need any UIGestureRecognizers.

Answer 3

Ok so the solution is this one:
#IBOutlet var joke_cards: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad();
//Add gestures
let leftSwipeGest = UISwipeGestureRecognizer(target: self, action: #selector(funcForGesture))
leftSwipeGest.direction = .left
joke_cards.addGestureRecognizer(leftSwipeGest)
}
func funcForGesture(sender: UISwipeGestureRecognizer){
if sender.direction == .left {
//scroll to next item
let cellItems = self.joke_cards.indexPathsForVisibleItems
self.joke_cards.scrollToItem(at: cellItems.max()!, at: .centeredHorizontally, animated: true)
}
}