I have a requirement where I need to show a tableview with three rows always.
When user swipes to delete a row, I need to add a new row at the bottom.
While this happens, the swipe animation which moves the row to the left to delete has to be retained. I mean delete animation should not be affected. Is this possible?
First, your dataSource must return always 3 for your numberOfRows(in:) method. Then you can commit changes this way:
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
tableView.performBatchUpdates({
// Delete the swiped row
tableView.deleteRows(at: [indexPath], with: .left)
// Get the last row index (numberOfRows-1)
let lastRowIndex = tableView.numberOfRows(inSection: indexPath.section)-1
// Insert a new row at the end
tableView.insertRows(at: [IndexPath(row: lastRowIndex, section: 0)], with: .top)
}, completion: nil)
}
}
Don't forget to update the rest of your dataSource accordingly, because cells may be reused. The code need to be added before call performBatchUpdates. Something like that:
var cellsText = ["A","B","C"]
// Inside your tableView(:commit:forRowAt) method:
if editingStyle == .delete {
cellsText.remove(at: indexPath.row)
cellsText.append("D")
// ...
}
Related
I'm having trouble removing the last cell I have tried tableView.reloadData() and beginUpdate(), endUpadate(), and all these methods works fine if I have more than one cell, but when I come to deleting the last cell it didn't work and the tableView won't reloadData at the same time that I delete the last cell, other cells 2-3-4 no problem, Plus when I close the app everyThing works fine.
im deleting the cells from the firebase store its a document that contains data if concern
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
print("Deleted")
self.DriverOffers.remove(at: indexPath.row)
self.DriverOrdersTV.deleteRows(at: [indexPath], with: .automatic)
self.DriverOrdersTV.reloadData()
}else if editingStyle == .insert {
self.DriverOrdersTV.beginUpdates()
self.DriverOrdersTV.insertRows(at: [IndexPath.init(row: 0, section: 0)], with: .automatic)
self.DriverOrdersTV.endUpdates()
}
}
I am deleting row and want to get next behavior:
If I am deleting row that was selected, I need to get another row selected automatically.
And also if I have an additional trouble, when I am perform deleting, target row that is going to be deleted selecting automatically, I don't need it to be selected as I want to only delete it.
The main question is 1 for now.
I understand that maybe row: 0 does not exists anymore but t's not a point now, I just simplified code to make it more comfortable to discuss the point. I tried performBatchUpdates, and tried to move selectRow(at:section:) to completion closure as well, row selection not works too.
selectRow works perfectly after insertRows function, so I am confused.
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
tableView.beginUpdates()
tableView.deleteRows(at: [indexPath], with: .fade)
tableView.endUpdates()
tableView.selectRow(at: IndexPath(row: 0, section: 0), animated: false, scrollPosition: .middle)
}
}
As I understood your question, find this solution:
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
tableView.beginUpdates()
tableView.deleteRows(at: [indexPath], with: .fade)
tableView.endUpdates()
tableView.selectRow(at: indexPath, animated: true, scrollPosition: .none)
}
}
Pass indexPath while deleting a row and after endUpdates, you just need to set the same indexPath as SelectedRow.
Ok, I've found solution for the 1st question (just thought maybe such function can exist and typed didrowat, and xcode suggested this didEndEditingRowAt :)
override func tableView(_ tableView: UITableView, didEndEditingRowAt indexPath: IndexPath?) {
tableView.selectRow(at: IndexPath(row: 0, section: 0), animated: true, scrollPosition: .middle)
}
Now first part of question is answered, I've inserted selection there.
The second question is still opened, how to make selected row keeping still selected while I am removing another row. I don't need selected row to deselect at all if I am removing another one.
I have a TableViewController with rows that hold tasks. If a task has an attribute task.done = 1 I want to move it at the bottom from the table.
I can't provide any code, because I have no doubt how to do this.
My idea was in tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) using following code:
let element = tasks.remove(at: indexPath.row)
tasks.insert(element, at: tasks.count)
The issue is, that this needs to be done after the table is loaded, because if the first row is done = 1 for example, it will be moved to to bottom and will be processed at the end again.
You can programmatically remove a row from UITableView and insert a row programmatically. Before doing the operations on the UITableView, make sure to remove/add a specific item to the data source array. Otherwise, it'll just crash.
If you want to simply move the rows, you can use the code below. You need to do it in the place where the array which holds the data source is updated.
tableView.moveRow(at: oldIndexPath, to: newIndexPath)
If you want to do delete and insert new objects into the array, you may try the method as shown below.
let element = tasks.remove(at: indexPath.row)
tableView.deleteRows(at: indexPath, with: .automatic)
tasks.insert(element, at: tasks.count)
tableView.insertRows(at: [IndexPath(row: tasks.count, section: 0)], with: .automatic)
Wrap your code in a beginUpdates-endUpdates block.Use func moveRow(at indexPath: IndexPath, to newIndexPath: IndexPath)
For example: Not tested
self.tableView.beginUpdates()
let element = tasks.remove(at: indexPath.row)
let movingRowIndex = indexPath.row
tasks.insert(element, at: tasks.count)
let indexPath = NSIndexPath(forRow: movingRowIndex, inSection: 0)
var lastIndexPath = NSIndexPath(forRow:tasks.count, inSection: 0)
self.tableView.moveRow(at indexPath: IndexPath, to newIndexPath: lastIndexPath)
self.tableView.endUpdates()
I have an array which populates a table view - myPosts.
The first row of the table view is not part of the array.
Each row is its own section (with its own custom footer)
I am trying to perform a delete with the following code:
func tableView(profileTableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if (editingStyle == UITableViewCellEditingStyle.Delete) {
myPosts?.removeAtIndex(indexPath.section - 1)
profileTableView.beginUpdates()
let indexSet = NSMutableIndexSet()
indexSet.addIndex(indexPath.section - 1)
profileTableView.deleteSections(indexSet, withRowAnimation: UITableViewRowAnimation.Automatic)
profileTableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
profileTableView.endUpdates()
...
WS Call
...
}
}
And the log is reporting the following:
Invalid update: invalid number of rows in section 0. The number of
rows contained in an
existing section after the update (1) must be equal to the number of rows contained in that
section before the update (1), plus or minus the number of rows inserted or deleted from
that section (0 inserted, 1 deleted) and plus or minus the number of rows moved into or out
of that section (0 moved in, 0 moved out).'
Obviously the issue is related to 0 moved in, 0 moved out but I don't understand why that is? or what the solution would be?
Number of sections in tableView is as follows:
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
if self.myPosts == nil
{
return 1
}
return self.myPosts!.count + 1
}
Updated the answer for Swift 4.2 and made a few additional tweaks:
func tableView(_ tableView: UITableView,
commit editingStyle: UITableViewCell.EditingStyle,
forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
myPosts?.removeAtIndex(indexPath.section - 1)
let indexSet = IndexSet(arrayLiteral: indexPath.section)
profileTableView.deleteSections(indexSet, with: .automatic)
// Perform any follow up actions here
}
}
The use of beginUpdates() and endUpdates() is not necessary, since you are only doing one action that contains animation. If you are doing 2 or more, than it is worth combining them to get a fluid effect.
Also, this makes use of the Swift 3 classes, by doing away with the NSMutableIndexSet() call, which would require a conversion now to work with the deleteSections() call.
So the answer is just removing the line that deletes the rows.
So the code is here to delete:
func tableView(profileTableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if (editingStyle == UITableViewCellEditingStyle.Delete) {
myPosts?.removeAtIndex(indexPath.section - 1)
profileTableView.beginUpdates()
let indexSet = NSMutableIndexSet()
indexSet.addIndex(indexPath.section - 1)
profileTableView.deleteSections(indexSet, withRowAnimation: UITableViewRowAnimation.Automatic)
// profileTableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
profileTableView.endUpdates()
...
WS Call
...
}
}
What I have is a table view with different cells that display different messages with other people you're chatting with. Upon swiping the cell to the left, a Delete option shows up. I want to be able to delete both the cell itself as well as the Room associated with it in Parse. This is what I have so far:
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == UITableViewCellEditingStyle.Delete {
//Delete messages here
let query = PFQuery(className: "Message")
query.whereKey("Room", equalTo: ??????)
tableView.beginUpdates()
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
tableView.endUpdates()
}
}
This function displays the Delete option, and when I click it, I want it to delete the cell it was clicked in. Does anyone know what goes inside the query? I have a Message class and I want to delete the Room key that's associated with the cell I delete.
Try this :
var dataToDelete:NSMutableArray = [] // this is a dummy array just to replicate your array
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == UITableViewCellEditingStyle.Delete {
var object = dataToDelete[indexPath.row] as! PFObject
tableView.beginUpdates()
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
tableView.endUpdates()
object.delete()
}
}