Delete button in UITableView (SWIFT)

Question

I have a piece of code here, which seems to be working just fine apart from one little piece.

import UIKit

class FirstViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
    @IBOutlet var tblTasks: UITableView!

    //Returning to view
    override func viewWillAppear(animated: Bool) {
        tblTasks.reloadData();
    }

    //UItableViewDataSource
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
        return taskMgr.tasks.count
    }

    func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
        return true
    }

    func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
        if (editingStyle == UITableViewCellEditingStyle.Delete) {
            // handle delete (by removing the data from your array and updating the tableview)
        }
    }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell{        
        let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: "test")
        cell.textLabel?.text = taskMgr.tasks[indexPath.row].name
        cell.detailTextLabel?.text = taskMgr.tasks[indexPath.row].desc
        return cell
     }
}

I have introduced these lines in order to be able to delete rows in the table view

func tableView(tableView: UITableView, 
               canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
    return true
}

func tableView(tableView: UITableView, 
               commitEditingStyle editingStyle: UITableViewCellEditingStyle, 
               forRowAtIndexPath indexPath: NSIndexPath) {
    if (editingStyle == UITableViewCellEditingStyle.Delete) {
        // handle delete (by removing the data from your array and updating the tableview)            
    }
}

and what they do is giving me the possibility to swipe rows from right to left, though the row doesn't get deleted.

What would be the best possible way to introduce a DELETE button in this case?

best regards, Vlad

Adding these methods isn't enough to delete rows. You need to remove the item from your datasource and delete the row from the table view as is described in the comment in your commitEditingStyle method. — Mick MacCallum
– Mick MacCallum, Commented Mar 1, 2015 at 14:01

Sir Godart · Accepted Answer · 2015-03-01 15:06:31Z

2

override func tableView(tableView: UITableView, commitEditingStyle  editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath:   NSIndexPath) { 

if editingStyle == UITableViewCellEditingStyle.Delete {
//delete row at selected index 
numbers.removeAtIndex(indexPath.row)
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic) 
              } 
 }

answered Mar 1, 2015 at 15:06

Sir Godart

334 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Vlad Besedovskyy Over a year ago

Thank you for the answer. I am now keep getting the error in numbers.removeAtIndex line (I have changed numbers to the name of my array). The error is: use of unresolved identifier (numbers)

CodeBender · Accepted Answer · 2017-07-20 19:45:40Z

1

Here is a cleaned up version for Swift 3.x:

func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
    if editingStyle == .delete {
        // Delete from your source, then update the tableView
        numbers.removeAtIndex(indexPath.row)
        tableView.deleteRows(at: [indexPath], with: .automatic)
    }
}

Check to make sure that the editingStyle is delete before proceeding
Remove the value from your data source (in this case, numbers)
Finally, pass in the indexPath as an array to be deleted, along with the animation you would like (in this case, automatic)

answered Jul 20, 2017 at 19:45

CodeBender

36.8k13 gold badges132 silver badges135 bronze badges

Comments

Silambarasan Raman · Accepted Answer · 2015-08-19 06:56:16Z

0

   func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
                if editingStyle == UITableViewCellEditingStyle.Delete { 
   yourArray.removeAtIndex(indexPath.row)

   tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)

    }

 }

answered Aug 19, 2015 at 6:56

Silambarasan Raman

131 silver badge6 bronze badges

Collectives™ on Stack Overflow

Delete button in UITableView (SWIFT)

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related