iOS Delete a Tableview Row

Deleting a Row from a UITableView in Swift?

Works for Swift 3 and Swift 4

Use the UITableViewDataSource tableView(:commit:forRowAt:) method, see also this answer here:

func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
  if editingStyle == .delete {
    print("Deleted")

    self.catNames.remove(at: indexPath.row)
    self.tableView.deleteRows(at: [indexPath], with: .automatic)
  }
}

Delete rows from tableview using swift

To define "[indexPath]". It becomes [IndexPath(row: indexPath.row, section: 0)]

tableView.deleteRows(at: [IndexPath(row: indexPath.row, section: 0)], with: .automatic)

or

recall the particular section in the table view also

This will work outside of the function

func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath)

Deleting the bottom row of TableView

Edit 2

After some experimentation, it appears to be an issue with iOS 12 (at least, on my iOS 12.4 simulator and device).

This can be (somewhat) confirmed by

• launch the default iPhone Reminders app
• add a bunch of reminders (I just used A, B, C, etc...) so you have enough that scrolling is needed
• scroll down to the last row
• delete the last row

You'll see that the row deletion animation is faulty. In fact, deleting any row does not provide the smooth animation we see in iOS 13.

Doing some searching I find similar issues back with iOS 7 reportedly fixed in iOS 8+ ... so perhaps the same bug returned in one of the iOS 12 versions. You may be able to use one of those older work-arounds, but based on comments it was pretty hit-or-miss.

I still stand by my initial comment, though, that there is no reason for:

tableView.reloadRows(at: [IndexPath(row: 0, section: 0)], with: .fade)

to be called after the row deletion.

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Original Answer

It sounds like you are doing too much...

This is all you should need to get the row to delete and the other rows to "slide down":

override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
    if editingStyle == .delete {
        Results.remove(at: indexPath.row)
        tableView.deleteRows(at: [indexPath], with: .fade)
    }
}

No need to reload the data.

See example here: https://imgur.com/a/JvDQ1P6

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Edit

Here is a complete (very simple) example. No @IBOutlet or @IBAction connections... just add a new table view controller to your Storyboard and assign its custom class to SampleTableViewController:

class SampleCell: UITableViewCell {

    let testView: UIView = {
        let v = UIView()
        v.translatesAutoresizingMaskIntoConstraints = false
        v.backgroundColor = .blue
        return v
    }()
    let testLabel: UILabel = {
        let v = UILabel()
        v.translatesAutoresizingMaskIntoConstraints = false
        v.backgroundColor = .cyan
        return v
    }()

    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        commonInit()
    }
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        commonInit()
    }

    @objc
    func commonInit() -> Void {

        contentView.addSubview(testView)
        contentView.addSubview(testLabel)
        let g = contentView.layoutMarginsGuide

        // avoid constraint warnings
        let c = testView.bottomAnchor.constraint(equalTo: g.bottomAnchor, constant: 0.0)
        c.priority = UILayoutPriority(rawValue: 999)

        NSLayoutConstraint.activate([

            c,
            testView.topAnchor.constraint(equalTo: g.topAnchor, constant: 0.0),
            testView.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 0.0),
            testView.heightAnchor.constraint(equalToConstant: 50.0),
            testView.widthAnchor.constraint(equalTo: testView.heightAnchor),

            testLabel.leadingAnchor.constraint(equalTo: testView.trailingAnchor, constant: 12.0),
            testLabel.centerYAnchor.constraint(equalTo: testView.centerYAnchor),
            testLabel.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: 0.0),

        ])

    }

}

class SampleTableViewController: UITableViewController {
    var data: [String] = []

    override func viewDidLoad() {
        super.viewDidLoad()

        // fill data array with 30 strings
        data = (1...30).map { "This is row \($0)" }

        tableView.register(SampleCell.self, forCellReuseIdentifier: "SampleCell")
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return data.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let c = tableView.dequeueReusableCell(withIdentifier: "SampleCell", for: indexPath) as! SampleCell
        c.testLabel.text = data[indexPath.row]
        return c
    }

    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
        if editingStyle == .delete {
            data.remove(at: indexPath.row)
            tableView.deleteRows(at: [indexPath], with: .fade)
        }
    }
}

iOS Swift - Deleting row in tableview within a tableViewCell

The problem is not in beginUpdates, endUpdates etc. It's in ToDoTableViewCell logics.

As the error text hints, you are deleting and/or inserting incorrect number of rows.

Consider this example:
You delete 1 object from your data source (i.e. toDos), you call tableView.deleteRows(at: [indexPath], with: .fade) for one indexPath.

Have that been the case, everything would be fine. But the error says that you had 3 rows before the update, now you have 5 rows after the update. And remember, you deleted 1 row, so you should be having 2 rows. How could this happen?.. App crashes.

The problem is that you are inserting objects to your data source somewhere, but are not calling tableView.inserRows(...). You need to figure this out.

Tableview deleting rows and sections

Solution: just add inverted indexPath array. let invertedIndexPathes = selectedRows.sorted(by: >)

Fixed mechanism:

guard let selectedRows = self.tableView.indexPathsForSelectedRows,
       let indexPath = self.tableView.indexPathForSelectedRow else { return }

let invertedIndexPathes = selectedRows.sorted(by: >)
self.tableView.beginUpdates()
            
for itemIndexPath in invertedIndexPathes {
    self.dataSource[itemIndexPath.section].rows.remove(at: itemIndexPath.row)
    self.tableView.deleteRows(at: [itemIndexPath], with: .fade)
    self.tableView.reloadData()
}
            
if self.dataSource[indexPath.section].rows.isEmpty {
    self.dataSource.remove(at: indexPath.item)
    self.tableView.deleteSections(IndexSet(arrayLiteral: indexPath.section), with: .fade)
}
            
self.tableView.endUpdates()

How to delete a row from UITableView

1) The problem with deleting is

[categoryArray removeObjectAtIndex:indexPath.row];

Remove it from db too.

Once you delete the row, reload the tableView using [tableView reloadData]

2) There is no problem if it is the only one item

Edit:

This is the problem

[categoryArray removeObjectAtIndex:indexPath.row];
NSString *selectedCategory = [categoryArray objectAtIndex:indexPath.row];

You have deleted the value at indexPath.row from array after that accessing the value at same indexPath.row, obviously it will delete the next value only.. :)

So put that

NSString *selectedCategory = [categoryArray objectAtIndex:indexPath.row]

line before [categoryArray removeObjectAtIndex:indexPath.row];

Error when Removing Row from TableView (Swift)

self.sections[indexPath.section].items.remove(at: indexPath.row)
    self.tableView.beginUpdates()
    DispatchQueue.main.async {
        tableView.deleteRows(at: [indexPath], with: .automatic)
        self.tableView.endUpdates()
    }

Try removing item from your data source before beginUpdates(). You can also just remove item from the data source and reload the table view as you are setting the animation option as automatic, so tableview will perform the preferable animation.

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