How to enable swipe to delete cell in a TableView?

Question

I have a UIViewController that implements TableViews delegate and datasource protocols. Now I want to add \"swipe to delete\" gesture to cells.

Answer 1

After iOS 8.0, you can custom you action in

- (nullable NSArray<UITableViewRowAction *> *)tableView:(UITableView *)tableView editActionsForRowAtIndexPath:(NSIndexPath *)indexPath

Answer 2

As Dan has commented above, you need to implement the following table view delegate methods:

1. tableView:canEditRowAtIndexPath:
2. tableView:commitEditingStyle:forRowAtIndexPath:

Note: I have tried this in iOS 6 and iOS 7.

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return YES - we will be able to delete all rows
    return YES;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Perform the real delete action here. Note: you may need to check editing style
    //   if you do not perform delete only.
    NSLog(@"Deleted row.");
}

Answer 3

You don't have to set editing:YES if you need to show Delete button on cell swipe. You have to implement tableView:canEditRowAtIndexPath: and return YES from there for rows you need to edit/delete. This is not necessary when your tableView's dataSource is a subclass of UITableViewContoller - this method, if not overridden, returns YES by default. In all other cases you have to implement it.

EDIT: Together we have found the problem - tableView:editingStyleForRowAtIndexPath: returned UITableViewCellEditingStyleNone if table wasn't in editing mode.

Answer 4

If you are using an NSFetchedResultsControllerDelegate to populate the table view, this worked for me:

• Make sure tableView:canEditRowAtIndexPath returns true always

• In your tableView:commitEditingStyle:forRowAtIndexPath implementation, do not delete the row directly from the table view. Instead, delete it using your managed object context, e.g.:

  if editingStyle == UITableViewCellEditingStyle.Delete {
      let word = self.fetchedResultsController.objectAtIndexPath(indexPath) as! Word
      self.managedObjectContext.deleteObject(word)
      self.saveManagedObjectContext()
  }
  
  func saveManagedObjectContext() {
      do {
          try self.managedObjectContext.save()
      } catch {
          let saveError = error as NSError
          print("\(saveError), \(saveError.userInfo)")
      }
  }
  

Answer 5

Please try this code in swift,

override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
   // let the controller to know that able to edit tableView's row 
   return true
}

override func tableView(tableView: UITableView, commitEditingStyle editingStyle UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath)  {
   // if you want to apply with iOS 8 or earlier version you must add this function too. (just left in blank code)
}

override func tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath) -> [UITableViewRowAction]?  {
   // add the action button you want to show when swiping on tableView's cell , in this case add the delete button.
   let deleteAction = UITableViewRowAction(style: .Default, title: "Delete", handler: { (action , indexPath) -> Void in

   // Your delete code here.....
   .........
   .........
   })

   // You can set its properties like normal button
   deleteAction.backgroundColor = UIColor.redColor()

   return [deleteAction]
}

Answer 6

Try adding the following to your class:

// Override to support conditional editing of the table view.
- (BOOL) tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    return(YES);
}