I've added commit editingStyle... function to enable swipe left on UITableView cells. It doesn't work unless I hold ALT. Then two gray circles appear and I can swipe using the bottom one and delete button appears on the cell just fine.
What can be wrong?
Here's some code:
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
my-delete-func()
}
}
I've tried adding canEditRowAt indexPath -> return true and allowsMultipleSelectionDuringEditing = false. It didn't help.
Related
I have implemented a leading swipe action ('Delete') on my tableView which for a reason I can't figure out is also appearing as a trailing swipe action. See code below:
func tableView(_ tableView: UITableView, leadingSwipeActionsConfigurationForRowAt indexPath: IndexPath) ->
UISwipeActionsConfiguration? {
let delete1 = deleteAction(at: indexPath)
return UISwipeActionsConfiguration(actions: [delete1])
}
func deleteAction(at indexPath: IndexPath) -> UIContextualAction {
let action = UIContextualAction(style: .destructive, title: "Delete") { (action, view, completion) in
self.delete(at: indexPath)
}
return action
}
I used to have a trailing swipe action, but I deleted this function out completely. When I change 'leadingSwipeActionsConfigurationForRowAt' to 'trailingSwipeActions...' then only the trailing swipe action appears. Be grateful if anyone could tell me what I've missed. Thanks.
Use this code to prevent trailingSwipeAction()
func tableView(_ tableView: UITableView, editingStyleForRowAt indexPath: IndexPath) -> UITableViewCell.EditingStyle
{
return .none
}
or
func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
return UISwipeActionsConfiguration(actions: [])
}
Because that is the default behaviour, when swipes are enabled. You can do something like this to disable swipes on the trailing side, if you want to implement the destructive delete action on the left only.
func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
return UISwipeActionsConfiguration(actions: [])
}
By passing an empty set of actions, the trailing swipe will disappear due to having 0 set of possible actions.
If a row is deleted, tableView shows black area below cells, while tableView has white background color as with the cell view.
Look at this:
https://www.dropbox.com/s/55ssb73t0ngr9yj/screenshot.png?dl=0
After deleting a row (it can be any one of them, not necessarily the last one), suddenly, black area shows up, though I didn't change any constraint or height of the tableView. Also, behind tableView, there is nothing in this area other than the 'self.view' whose background is also white, and in front of table view, no view is positioned. (one view is there, but it is the size of the screen, so it cannot be black only for this area.)
extension ApptDetailViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return appt.places.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "ApptDetailCell", for: indexPath) as! ApptDetailCell
cell.placeNumLabel.text = "Place \(indexPath.row + 1)"
cell.placeNameLabel.text = appt.places[indexPath.row]
return cell
}
}
extension ApptDetailViewController: UITableViewDelegate {
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 60
}
func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
let moveString = appt.places.remove(at: sourceIndexPath.row)
let moveBool = appt.reachedPlaces.remove(at: sourceIndexPath.row)
appt.places.insert(moveString, at: destinationIndexPath.row)
appt.reachedPlaces.insert(moveBool, at: destinationIndexPath.row)
print("appt.places: \(appt.places)")
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
// deletion occurred.
appt.places.remove(at: indexPath.row)
appt.reachedPlaces.remove(at: indexPath.row)
tableView.deleteRows(at: [indexPath], with: .right)
}
}
}
As per our comment discussion —You can debug your UI using the view heirarchy debugger. This helps pinpoint anomalies in your views.
Or try to change the tableview background color.
I am using a table view which consists of three sections. User can delete the rows for third section. But while I am using table view delegate method for deleting rows ,It is affecting for other sections. So how could I overcome from this problem?
Here is my code
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == UITableViewCellEditingStyle.Delete {
numbers.removeAtIndex(indexPath.row)
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
}
If you want to restrict editing to section 2 implement canEditRowAt (code is Swift 3+)
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return indexPath.section == 2
}
Or add a check
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete && indexPath.section == 2 {
numbers.remove(at: indexPath.row)
tableView.deleteRows(at: [indexPath], with: .automatic)
}
In function with forRowAt indexPath: IndexPath you have IndexPath value.
It contains .section. So, you can simply check, which section have you selected and then do or not do deleting.
To delete rows for specific section:
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
Hope it helps
correct way of doing this is
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return indexPath.section == 2
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath)
{
if editingStyle == .delete && indexPath.section == 2
{
yourArray.remove(at: indexPath.row)
yourtable.reloadData()
}
}
I've built a simple toDoList app with Swift 3. Now I want to be able to delete my items from a TableView by swiping from right to left. This code is what I've found. But nothing happens when I swipe to the left.
CODE:
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
return toDoList.count
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, cellForRowAtIndexPath indexPath: IndexPath) -> UITableViewCell {
let cell = UITableViewCell(style: UITableViewCellStyle.default, reuseIdentifier: "Cell")
cell.textLabel?.text = toDoList[indexPath.row]
return cell
}
//
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if (editingStyle == .delete) {
toDoList.remove(at: indexPath.row)
UserDefaults.standard.set(toDoList, forKey: "toDoList")
tableView.reloadData()
}
}
func tableView(_ tableView: UITableView, editingStyleForRowAt indexPath: IndexPath) -> UITableViewCellEditingStyle {
return .delete
}
This still does not work. Nothing happens when I swipe to the left. The to do List itself is working. I can add items to the table but I just can't remove them.
Thanks :)
Did you implement tableView:canEditRowAtIndexPath: method?
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
EDIT:
Thanks to #rmaddy for mentioning that the default value of tableView:canEditRowAtIndexPath: is true, implementing it doesn't solve the problem.
I'm not pretty sure of what are you trying to do from your code snippet, so make sure that you are implementing the following methods (UITableViewDelegate):
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if (editingStyle == .delete) {
toDoList.remove(at: indexPath.row)
UserDefaults.standard.set(toDoList, forKey: "toDoList")
tableView.reloadData()
}
}
func tableView(_ tableView: UITableView, editingStyleForRowAt indexPath: IndexPath) -> UITableViewCellEditingStyle {
return .delete
}
You can also keep the implementation of tableView:canEditRowAtIndexPath: method:
Asks the data source to verify that the given row is editable.
So, -for example- if you want to let the first row is not editable, i.e user cannot swipe and delete the first row, you should do somthing like:
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
if indexPath.row == 0 {
return false
}
return true
}
Make sure that the UITableViewDataSource and UITableViewDelegate are connected with the ViewController.
In Swift. How can I add a swipe to delete on cell (still showing the color and label of delete) but as the swipe is ended it does the delete action. I saw the same questioned answered elsewhere but was for objective c. I'm not sure if swift has any new implementation for this. Any help would be great.
Thanks
you can make use of these two methods other than the basic UITableView implementations :
override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
return true
}
override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == .Delete {
objects.removeAtIndex(indexPath.row)
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
}
}