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()
}
}
Related
I have a dictionary that I have made called places and I made each cell in the tableViewController show each parts of the dictionary. I know the function to delete the rows in the controller, but when I run the app and do the action of deleting nothing happens.
// This is my entire TableViewController. I have another ViewController that appends the dictionary.
var places = [Dictionary<String,String>()]
var activePlace = -1
class TableViewController: UITableViewController {
override func viewDidLoad() {
super.viewDidLoad()
if UserDefaults.standard.object(forKey: "places") != nil { //checks if the list is not empty
places = UserDefaults.standard.object(forKey: "places") as! [Dictionary<String, String>]
}
if places.count == 1 {
places.remove(at: 0)
places.append(["name":"Ex. Eiffel Tower", "lat": "48.858324", "lon": "2.294764"])
}
}
// MARK: - Table view data source
override func tableView(_ tableView: UITableView, canEditRowAt
indexPath: IndexPath) -> Bool {
return true
}
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return places.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
DispatchQueue.main.async {
self.tableView.reloadData()
}
cell.textLabel?.text = places[indexPath.row]["name"]
return cell
}
override func tableView(_ tableView: UITableView, willSelectRowAt indexPath: IndexPath) -> IndexPath? {
activePlace = indexPath.row
return indexPath
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "newPlace" {
activePlace = -1
}
}
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
tableView.deleteRows(at: [indexPath], with: .bottom)
places.remove(at: indexPath.row)
UserDefaults.standard.setValue(places, forKey: "places")
}
}
I am expecting that when I make the action of swiping to the left that it would delete the row and the contents of the cell from the tableView. Then it would also delete from the dictionary.
It's very complicate to delete table view cell sometimes. Your code is correct but you just need to remove a line. Instead of calling tableview.deleteRows you just delete the item of your dictionary and reload the table view.
Enable the table rows to editable using canEditRowAt function....
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
places.remove(at: indexPath.row)
UserDefaults.standard.setValue(places, forKey: "places")
tableView.reloadData()
}
}
Move deleteRows(at:with:) after remove(at:) in tableView(_: commit: forRowAt:) method, i.e.
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
places.remove(at: indexPath.row)
tableView.deleteRows(at: [indexPath], with: .bottom) //here...
UserDefaults.standard.setValue(places, forKey: "places")
}
}
The main issue is the wrong declaration of the data source array. The pair of parentheses must be behind the brackets
var places = [Dictionary<String,String>]()
In the method tableView(_:commit:forRowAt:the order is wrong. First remove the row from the data source array then delete the row.
Two Don'ts
Do not use setValue:forKey with UserDefaults to save a single value.
Do not declare the data source array outside of the class.
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
places.remove(at: indexPath.row)
tableView.deleteRows(at: [indexPath], with: .bottom)
UserDefaults.standard.set(places, forKey: "places")
}
}
Solved:
DispatchQueue.main.async was creating an endless loop of constantly reloading the data. By removing that the two functions of editing were allowed to run. I was able to perform the deleting action.
Here is my function for deleting cells in Swift 3. How would I write this in Swift 5?
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath)
{
if editingStyle == UITableViewCellEditingStyle.delete
{
foods.remove(at: indexPath.row)
tableView.reloadData()
}
}
Thank you for the help.
Apple refactorized UITableViewCellEditingStyle to UITableViewCell.EditingStyle
So now it should be
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == UITableViewCell.EditingStyle.delete {
foods.remove(at: indexPath.row)
tableView.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.
I have a table of names and I am making a swipe and delete function for them which removes them from a names variable which is an array.
I selected the functions which most closely resembled the tutorial inside xcode and filled them out, but my app crashes randomly when I click the delete button. Here is my code for the delete button:
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
let deleteAction = UITableViewRowAction(style: .destructive, title: "Delete") { (rowAction: UITableViewRowAction, indexPath: IndexPath) -> Void in
print("Deleted")
self.catNames.remove(at: indexPath.row)
self.tableView.deleteRows(at: [indexPath], with: UITableViewRowAnimation.automatic)
self.tableView.reloadData()
}
}
I'm new to coding and learning swift, I am following a tutorial for swift 2 and working with swift 3 so there are a few issues I have when following along, this being one I'm properly stuck on.
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)
}
}
First you need to add this function
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
then your function is ok but no need of tableview reload data just call tableview.beingUpdates and tableview.endUpdates
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
print("Deleted")
self.catNames.remove(at: indexPath.row)
self.tableView.beginUpdates()
self.tableView.deleteRows(at: [indexPath], with: .automatic)
self.tableView.endUpdates()
}
}
In Swift 4 Try This
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if (editingStyle == .delete) {
arrStudentName.remove(at: indexPath.row)
tableView.beginUpdates()
tableView.deleteRows(at: [indexPath], with: .middle)
tableView.endUpdates()
}
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
self.animals.remove(at: indexPath.row)
self.dataDisplayTbleView.reloadData()
}
}
**
for swift 3
**
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)
}
}
My answer for you
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool
{
return true
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath)
{
if editingStyle == .delete
{
array.remove(at: indexPath.row)
tblDltRow.reloadData()
}
}
You need to refresh the table
You don't have to reload the tableView.
Before you use tableView.deleteRows(at: [IndexPath], with: UITableView.RowAnimation) you must substrate the number of rows you want delete in numberOfRowsInSection
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return //Your current number of rows - The number of rows to delete
}
Normally the number of rows is the number of Items from an array (yourArray.count), that means you can delete the items from this array before you delete the cells and you get the same result.
self.tableView.beginUpdates()
self.tableView.deleteRows(at: [ IndexPath(row: index, section: section) ], with: .fade)
self.remove_object_from_model()
self.tableView.endUpdates()
For Swift 5
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
print("Deleted")
self.catNames.remove(at: indexPath.row)
self.tableView.deleteRows(at: [indexPath], with: .automatic)
}
}
I'm trying to add functionality so the user can delete a table cell. However, this table cell is populated using a dictionary so I'm getting an error message: "cannot invoke 'removeAtIndex' with an argument list of type {index: Int)
Here's my code:
var titles = [Int: String]()
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == UITableViewCellEditingStyle.Delete {
titles.removeAtIndex(index: indexPath.row)
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
}
}
You need to call removeValueForKey method, because you use Int as keys. The
An you need to add beginUpdates and endUpdates method calls as well to perform the animations.
See the code below:
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == UITableViewCellEditingStyle.Delete {
table.beginUpdates()
titles.removeValueForKey(index: indexPath.row)
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
table.endUpdates()
}
}
Note: in such a case, consider using Array instead of Dictionary? You don't actually need dictionary since it will be indexed from row 0 to row count-1, right?