Detecting a tap on UILabel inside a cell

Question

I have a UITapGestureRecognizer on a label as:

cell.label.userInteractionEnabled = true
let gestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(ViewController.labelTapped))
cell.label.addGestureRecognizer(gestureRecognizer)

I’d want it to change text when a user taps on it. After hours of looking for an answer on Stackoverflow, I’ve reached at a point where I could change text of a label. But it also changes text on other cell labels. Here’s what I implemented:

 func labelTapped(recognizer: UIGestureRecognizer){
        print("Label tapped.")

        let position: CGPoint =  recognizer.locationInView(self.tableView)
        let indexPath: NSIndexPath = self.tableView.indexPathForRowAtPoint(position)!
        let cell = self.tableView.cellForRowAtIndexPath(indexPath) as! DataTableViewCell
        
        cell.label.text = "Test."
    }

Help me find a solution.

Answer 1

I would recommend changing the DataSource as Sneak already mentioned. You can then reload your tableView at specified IndexPaths to get desired result:

func handleLabelTap(sender: UIGestureRecognizer) {
    // Get references
    guard let label = sender.view as? UILabel else {
        print("Error not a label")
        return
    }
    let position = sender.location(in: self.tableView)
    guard let index = self.tableView.indexPathForRow(at: position) else { 
        print("Error label not in tableView")
        return
     }

    // Notify TableView of pending updates
    self.tableView.beginUpdates()
    defer { self.tableView.endUpdates() }

    // Alter Datasource
    self.data[index.row] = "Changed Value"
    self.tableView.reloadRows(at: [index], with: .automatic)
}

Where self.data is an array of String which represents your DataSource.

Edit: Swift 2.3 version as suggested in comments.

func handleLabelTap(sender: UIGestureRecognizer) {
    // Get references
    guard let label = sender.view as? UILabel else {
        print("Error not a label")
        return
    } 
    let position = sender.locationInView(self.tableView) 
    guard let index = self.tableView.indexPathForRowAtPoint(position) else { 
        print("Error label not in tableView")
        return
    } 

    // Notify TableView of pending updates
    self.tableView.beginUpdates() 
    defer { self.tableView.endUpdates() } 

    // Alter DataSource
    self.data[index.row] = "Changed Value" 
    self.tableView.reloadRowsAtIndexPaths([index], withRowAnimation: .Automatic)
}