Passing Parameters to Action Functions in Swift - ios

Question

I created tableView cells with an action and I need the action to know the indexPath of the cell that is selected. I can't figure out how to pass the indexPath as a parameter to the action or find any other way around it. Here is the code for the tableView cellForRowAt and the action to be performed:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "menuCell", for: indexPath) as! CustomCell
cell.foodName.text = self.menuItems[indexPath.row]
//adding gesture recognizer with action Tap to cell
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(Tap(gesture:index:IndexPath.row)))
cell.addGestureRecognizer(tapGesture)
return cell
}
func Tap(gesture: UIGestureRecognizer , index: Int){
print("Tap")
//necessary so that the page does not open twice
//adding the rating view
let ratingVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "rating") as! RatingView
ratingVC.foodName = selectedItem
self.addChildViewController(ratingVC)
ratingVC.view.frame = self.view.frame
self.view.addSubview(ratingVC.view)
ratingVC.didMove(toParentViewController: self)
}
I can't figure out how to pass the IndexPath.row as a parameter to Tap.

Answer 1

You don't have to do the functionality of selecting the cell, UITableViewDelegate already has this kind of behaviour.
By conforming to UITableViewDelegate and implementing tableView(_:didSelectRowAt:) method, you will be able to get the indexPath.row for the selected cell:
Tells the delegate that the specified row is now selected
So, after implementing tableView(_:didSelectRowAt:) you should get rid of tapGesture functionality, it should be similar to:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "menuCell", for: indexPath) as! CustomCell
cell.foodName.text = self.menuItems[indexPath.row]
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("Selected row: \(indexPath.row)")
}

Answer 2

Use didSelectRowAt Indexpath method.
For custom Tap use following steps.
Assign tag to your cell.
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.tapBlurButton(_:)))
cell.tag = indexPath.row
cell.addGestureRecognizer(tapGesture)
2.Manage tap event
func tapBlurButton(_ sender: UITapGestureRecognizer) {
//Get indexpath.row value or Indexpath Value
print(sender.view.tag)
}
Hope it helps. :)

Answer 3

First, remove the tap gesture. Second implement the didSelectRow delegate of the tableView like this:
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
//add your rating view code here
let ratingVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "rating") as! RatingView
ratingVC.foodName = self.menuItems[indexPath.row] //get the selected item
self.addChildViewController(ratingVC)
ratingVC.view.frame = self.view.frame
self.view.addSubview(ratingVC.view)
ratingVC.didMove(toParentViewController: self)
}
Of course, you will want to add checks and guards to make sure you catch any errors.