TableView 滑动删除：如何以编程方式取消滑动

Question

I am using a the swipe to delete feature in the tableview to delete selected cells. You swipe it to the left to reveal a delete button. My code works well and deletes like it should.

I am also including a UIAlertController to give the user of the app a single last chance from making a mistake. What I would like to do is if the user selects "Cancel" is have the cell "un-swipe" and return to its original position. Is there a way to do this?

Answer 1

您可以关闭 tableView 上的编辑

[self.tableView setEditing:NO animated:YES];

Answer 2

I came across this question trying to do the same thing. I thought there had to be a better solution that reloading the table, so I did some further research and found the following.

tableView.setEditing(false, animated: true)

here's a little more code (Swift 3) to show it in use

    // Custom cell edit actions
func tableView(_ tableView: UITableView, editActionsForRowAt: IndexPath) -> [UITableViewRowAction]? {
    let delete = UITableViewRowAction(style: .destructive, title: "Delete") {(rowAction: UITableViewRowAction, indexPath: IndexPath) -> Void in

        let refreshAlert = UIAlertController(title: "Delete", message: "Are you sure you want to delete this item.", preferredStyle: UIAlertControllerStyle.alert)

        refreshAlert.addAction(UIAlertAction(title: "Yes", style: .default, handler: { (action: UIAlertAction!) in
            let context = self.fetchedResultsController.managedObjectContext
            context.delete(self.fetchedResultsController.object(at: indexPath))

            do {
                try context.save()
            } catch {
                let nserror = error as NSError
                fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
            }
        }))

        refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { (action: UIAlertAction!) in
            // if the user presses cancel, slide the cell back
            tableView.setEditing(false, animated: true)
        }))

        self.present(refreshAlert, animated: true, completion: nil)

    }

    let editAction = UITableViewRowAction(style: .normal, title: "Edit") { action, index in
        print("edit button tapped")
    }

    editAction.backgroundColor = .orange


    return [editAction, delete]
}

Answer 3

I have had a similar question and found your question searching for an answer. Based on the lack of answers here, I assumed I had to figure it out myself. Here is my issue and how I solved it. I hope it works for you, since I solved it extremely simple.

I have an app with a start screen that shows a table with several tracks. When you select a track you can either show the track details, show the track on a map (with MapView) or delete the track.

However, when you first use the app, the table is empty and shows a single table cell: "No saved tracks".

This means the table is empty and you can't show track details, a track map or delete the track. I wanted to make sure that if the table is empty, you get a different message and the left swipe is undone.

The code is an overige of funk -tableView:editActionsForRowAtIndexPath indexPath:

override func tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath) -> [UITableViewRowAction]? {

    let selectedRow = indexPath.row

    guard self.savedTracks.count > 0 else {
    //There are no saved tracks, the action cannot be executed.
        let faultAction = UITableViewRowAction(style: .Normal, title: "No tracks", handler: { (action, indexPath) -> Void in

            self.trackOverviewTable.reloadData() //Simply reload the table view after the action button is hit.
        })

        return [faultAction]
    }

    //Show track details
    let detailsAction = UITableViewRowAction(style: .Default, title: "Details") { (action, indexPath) -> Void in

        print("I now selected the track details view.\n")
        self.newTrack = self.savedTracks[selectedRow]
        self.performSegueWithIdentifier("showTrackDetails", sender: self)
    }

    //Show track map
    let mapAction = UITableViewRowAction(style: .Normal, title: "Map") { (action, indexPath) -> Void in

        print("I now selexted the track map view.\n")
        self.newTrack = self.savedTracks[selectedRow]
        self.performSegueWithIdentifier("showTrackMap", sender: self)
    }

    //Delete the selected track
    let deleteAction = UITableViewRowAction(style: .Default, title: "Delete") { (action, indexPath) -> Void in

        print("I now pressed the delete button.\n")
        self.savedTracks.removeAtIndex(selectedRow)
        if self.savedTracks.count > 0 {
            self.trackOverviewTable.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
        } else {
            self.trackOverviewTable.reloadData()
        }
    }

    detailsAction.backgroundColor = UIColor(colorLiteralRed: 21.0/255.0, green: 175.0/255.0, blue: 253.0/255.0, alpha: 0.8)
    mapAction.backgroundColor = UIColor(colorLiteralRed: 37.0/255.0, green: 155.0/255.0, blue: 253.0/255.0, alpha: 0.8)

    return [deleteAction, mapAction, detailsAction]
}

The important part here is the "guard else" statement, where the code is executed when there is no track saved. Basically, the swipi shows a different message "No tracks" and when this action button is clicked, the table will be reloaded and the swipe is undone. Since you use a UIAlertController, the same principle applies. The above methods works almost exactly the same as a UIAlertController and you can also reload your table after the user selects the "Cancel" button.

As I said, it is extremely simple and perhaps not meeting your expectations, but it does unswipe your left swipe after the user click "Cancel". I hope it works for you.

Answer 4

I have followed this approach and it works quite well

private func onDeleteNote(noteIdx: Int) {
        let noteToDelete: Note = myNotes[noteIdx]
        
        let alertViewController = UIAlertController(title: "¿Would you like to delete this note?", message: "The Note \(noteToDelete.title) will be delete", preferredStyle: .alert)
        
        alertViewController.addAction(UIAlertAction(title: "Delete", style: .destructive) { (UIAlertAction) in
            print("Delete note")
        })
        alertViewController.addAction(UIAlertAction(title: "Cancel", style: .cancel) { (UIAlertAction) in
            print("Delete note was cancel")
            self.myNotesTable.reloadRows(at: [IndexPath(row: noteIdx, section: 0)], with: .right)
        })
        
        present(alertViewController, animated: true, completion: nil)
        
    }

When the user cancel the operation I try to reload this table cell for discarding the swipe state.