How to add swipe gesture for uilabel inside tableview in ios swift?

问题

I am trying to creating check list in a table view. Inside table view radio button and UILabel, here adding swipe gesture to UILabel. For single swipe of UILabel will show radio button or double swipe of UILabel will show dash line.

I have tried of adding gesture to UILabel inside table by using selector method, it print successfully but UILabel is not swiping.

Here is the code tried of swiping UILabel:

In viewDidLoad:

let gestureRec = UISwipeGestureRecognizer(target: self, action: #selector(didTap(sender:)))
    tableView.addGestureRecognizer(gestureRec)
    gestureRec.delegate = self as? UIGestureRecognizerDelegate

And created function called didTap:

     @objc func didTap(sender : UISwipeGestureRecognizer)
      {
      if sender.state == .ended {
        let location = sender.location(in: self.tableView)
        let indexPath = self.tableView.indexPathForRow(at: location)
        var cell = self.tableView.cellForRow(at: indexPath!) as! textCell
        print("swipe")
        cell.labelView.frame(forAlignmentRect: CGRect(x: 10, y: 8, width: 20, 
     height: 15))

    }
   }

回答1:

Try this code. Tested and working fine 100 %

let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
    cell.textLabel?.text = tableDataSource[indexPath.row]
    cell.textLabel?.isUserInteractionEnabled = true
    let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(self.labelSwipedLeft(sender:)))
    cell.textLabel?.addGestureRecognizer(swipeLeft)
    return cell

@objc func labelSwipedLeft(sender: UITapGestureRecognizer) {
    print("labelSwipedLeft called")
  }

See the output

Additional: If you want to detect which row's label was tapped, then assign a tag to the label in cellForRowAt like

cell.textLabel?.tag = indexPath.row

And get the row index in the function labelSwipedLeft using

print("labelSwipedLeft called for row \(sender.view!.tag)")

回答2:

The first thing I noticed is that you are adding the gesture on UITableView and not UILabel. So you need to fix that first.
Secondly, for a gesture to work correctly on a control, you must enable the user interaction property of that control, else it won't respond to the gesture. So :

label.isUserInteractionEnabled = true

You can add the gesture as follows :

let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(swipedToLeft))
swipeLeft.direction = UISwipeGestureRecognizerDirection.Left
label.addGestureRecognizer(swipeLeft)

回答3:

I would suggest adding swipe gesture in cell class, rather than ViewController.

func setupGestures() {
    let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(handleLeftSwipe(_:)))
    swipeLeft.direction = UISwipeGestureRecognizerDirection.Left
    label.addGestureRecognizer(swipeLeft)
    label.isUserInteractionEnabled = true
}

@objc func handleLeftSwipe(_ recognizer: UISwipeGestureRecognizer) {

}

call setupGestures in awakeFromNib. Also if you want to drag the label, use pan gesture

来源：https://stackoverflow.com/questions/49870225/how-to-add-swipe-gesture-for-uilabel-inside-tableview-in-ios-swift

标签

ios

swift

xcode

uitableview

uiswipegesturerecognizer