Swipe to Like on UITableViewCell not working as expected - Swift - swift

Question

I'm using a UISwipeGestureRecognizer to detect a swipe for a cell in a UITableViewCell, similar to THIS LINK which will allow the user to 'Like' a photo.
The problem is that I dont quite understand how to change the Like value for that specific post - and it doesn't have an indexPath like other 'built-in' methods. I also don't understand how it knows to use the cell that is showing predominantly on the screen, since there might be more than one cell that has not yet been "dequeued"?:
#objc func mySwipeAction (swipe: UISwipeGestureRecognizer) {
switch swipe.direction.rawValue {
case 1:
print ("the PostID you selected to LIKE is ...")
case 2:
print ("the PostID you selected to Undo your LIKE is ...")
default:
break
}
}
and my tableView looks like this:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "postTopContributions", for: indexPath) as! PostTopContributions
let postImage = postImageArray [indexPath.row]
let imageURL = postImage.postImageURL
cell.delegate = self
cell.postSingleImage.loadImageUsingCacheWithUrlString(imageURL)
cell.postSingleLikes.text = "\(postImageArray [indexPath.row].contributionPhotoLikes)"
cell.postSingleImage.isUserInteractionEnabled = true
let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(self.mySwipeAction(swipe:)))
let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(self.mySwipeAction(swipe:)))
leftSwipe.direction = UISwipeGestureRecognizerDirection.left
rightSwipe.direction = UISwipeGestureRecognizerDirection.right
cell.postSingleImage.addGestureRecognizer(leftSwipe)
cell.postSingleImage.addGestureRecognizer(rightSwipe)
let selectedCell = self.postImageArray [indexPath.row]
return cell
}
I don't want to use the native TableView row swipe left to delete methods - for various UX purposes in this specific case.

Answer 1

You can try
cell.postSingleImage.addGestureRecognizer(leftSwipe)
cell.postSingleImage.addGestureRecognizer(rightSwipe)
cell.postSingleImage.tag = indexPath.row
Don't recommend adding gestures inside cellForRowAt , you may add
them inside init for programmatic cells or awakeFromNib for xib /
prototype cells
#objc func mySwipeAction (swipe: UISwipeGestureRecognizer) {
let index = swipe.view.tag
let selectedCell = self.postImageArray[index]
switch swipe.direction.rawValue {
case 1:
print ("the PostID you selected to LIKE is ...")
// edit dataSource array
case 2:
print ("the PostID you selected to Undo your LIKE is ...")
// edit dataSource array
default:
break
// reload table IndexPath
}
}

Answer 2

You can pass your indexpath as a parameter in your selector. and then add the like at yourArray[indexpath.row]

Answer 3

You can set the tag of the cell image that you are adding the GestureRecognizer to the indexPath row of the cell itself:
cell.postSingleImage.tag = indexPath.row
cell.postSingleImage.addGestureRecognizer(leftSwipe)
cell.postSingleImage.addGestureRecognizer(rightSwipe)
Then, you can determine which cell triggered the GestureRecognizer by getting the view's tag that triggered the swipe gesture:
#objc func mySwipeAction (gesture: UISwipeGestureRecognizer) {
let indexPathRow = gesture.view.tag
let indexPath = IndexPath(row: indexPathRow, section: 0) // assuming this is a 1 column table not a collection view
if let cell = tableView.cellForRow(at: indexPath) as? PostTopContributions {
// ... and then do what you would like with the PostTopContributions cell object
print ("the PostID you selected to LIKE is ... " + cell.id)
}
}
Hope that this helped!