I need to prevent last cell from second section from being moved and even to show the "right handle" that appears when tableview is editing.
I create cellsObject based upon a model which has an "identity" property in a Table with two cells. when using
func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {}
I move from one array to the other based upon the section.
how and where should I block to that cell with that identity from being moved anywhere? I tried this inside cellForRow:
if model.identity == "DoNotMove" l {
cell.isEditing = false
cell.shouldIndentWhileEditing = false
cell.editingAccessoryType = .none
}
but is not working, tested the same inside the method
func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {}
with crash result
Implement the data source method tableView(_:canMoveRowAt:)
func tableView(_ tableView: UITableView,
canMoveRowAt indexPath: IndexPath) -> Bool
and return false for the index path
Related
If a row is deleted, tableView shows black area below cells, while tableView has white background color as with the cell view.
Look at this:
https://www.dropbox.com/s/55ssb73t0ngr9yj/screenshot.png?dl=0
After deleting a row (it can be any one of them, not necessarily the last one), suddenly, black area shows up, though I didn't change any constraint or height of the tableView. Also, behind tableView, there is nothing in this area other than the 'self.view' whose background is also white, and in front of table view, no view is positioned. (one view is there, but it is the size of the screen, so it cannot be black only for this area.)
extension ApptDetailViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return appt.places.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "ApptDetailCell", for: indexPath) as! ApptDetailCell
cell.placeNumLabel.text = "Place \(indexPath.row + 1)"
cell.placeNameLabel.text = appt.places[indexPath.row]
return cell
}
}
extension ApptDetailViewController: UITableViewDelegate {
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 60
}
func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
let moveString = appt.places.remove(at: sourceIndexPath.row)
let moveBool = appt.reachedPlaces.remove(at: sourceIndexPath.row)
appt.places.insert(moveString, at: destinationIndexPath.row)
appt.reachedPlaces.insert(moveBool, at: destinationIndexPath.row)
print("appt.places: \(appt.places)")
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
// deletion occurred.
appt.places.remove(at: indexPath.row)
appt.reachedPlaces.remove(at: indexPath.row)
tableView.deleteRows(at: [indexPath], with: .right)
}
}
}
As per our comment discussion —You can debug your UI using the view heirarchy debugger. This helps pinpoint anomalies in your views.
Or try to change the tableview background color.
I have a tableView with a custom cell that I have told should give me 5 cells in return of this custom cell. The question now is that I am running the app and getting five rows on one row. I have changed from default size of cell to custom but that is nearly the only thing I have done. So now I wonder what can create this kind of problem?
The code of my tableView looks like this.
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 5
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "theoryCell") as! theoryTVC
return cell
}
So the problem is you are using custom cell with custom height but you are not setting height for row in table view method.
Try this:
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat
{
return 100.0 //Choose your custom row height
}
I am developing the application with swift. I stored the objection data named Categories. I've added the tableViewImage here and there is no problem here. I want to move the section of the tableview together with the cell, but it does not. The functions I wrote are below. Please help me.Thanks.
func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_tableview:UITableView, moveRowAtIndexPath sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath)
{
let temp = categories[sourceIndexPath.section]
categories[sourceIndexPath.section] = categories[destinationIndexPath.section];
categories[destinationIndexPath.section] = temp
}
func tableView(_ tableView: UITableView, shouldIndentWhileEditingRowAt indexPath: IndexPath) -> Bool {
return false
}
func tableView(_ tableView: UITableView, editingStyleForRowAt indexPath: IndexPath) -> UITableViewCellEditingStyle {
return .none
}
You can try using this method, assigning the position of the section you want to move and the place where you want it to be at the end:
table.moveSection(0, toSection: 1)
You could also try deleting the section in the IndexSet or appropriate position, subtracting in 1 the number of sections of the table and then reinserting the section and increasing the sections by 1
let index = IndexSet(integer: 0)
self.number_sections -= 1
table.deleteSections(index, with: .fade)
let newIndex = IndexSet(integer: 1)
self.number_sections += 1
table.insertSections(newIndex, with: .fade)
Is there a way that you can call
func tableView(_ tableView: UITableView, moveRowAt fromIndexPath: IndexPath, to toIndexPath: IndexPath) {
let affectedEvent = arrayMoved[fromIndexPath.row]
arrayMoved.remove(at: fromIndexPath.row)
arrayMoved.insert(affectedEvent, at: toIndexPath.row) }
in
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){}
tableView(_:moveRowAt:to:) is a delegate method, meaning it is a method that you should implement and let the system call you, not the other way around — normally you should not call a delegate method yourself.
If you want to tell the system to move a row, simply call moveRow(at:to:) of the table view, e.g.
func tableView(_ tableView: UITableView, didSelectRowAt ip: IndexPath) {
tableView.moveRow(at: ip, to: IndexPath(row: 0, section: ip.section))
}
After communicating with OP, want OP actually wants to reorder the model to push the selected item to the end. The typical way to do this is something like:
func tableView(_ tableView: UITableView, didSelectRowAt ip: IndexPath) {
// update the model.
model[ip.row].value = maxOfValue + 1
sortModelAgain()
// reload the model (note: no animation if using this)
tableView.reloadData()
}
or, if you'd like to manually keep the view and model in sync:
func tableView(_ tableView: UITableView, didSelectRowAt ip: IndexPath) {
// update the model.
model[ip.row].value = maxOfValue + 1
sortModelAgain()
// change the view to keep in sync of data.
tableView.beginUpdates()
let endRow = tableView.numberOfRows(inSection: ip.section) - 1
tableView.moveRow(at: ip, to: IndexPath(row: endRow, section: ip.section))
tableView.endUpdates()
}
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.