I added the following code in my iOS app to delete table cell from UITableViewController, but I get an error about the deletion.
-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{
if(editingStyle == UITableViewCellEditingStyleDelete){
[self.toDoItems removeObjectAtIndex:indexPath.row];
NSArray *indexPaths = #[indexPath];
[self.tableView deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationAutomatic];
}
}
Update:
toDoItems is just an NSArray, and I have tried the following code but is still not working:
-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{
if(editingStyle == UITableViewCellEditingStyleDelete){
NSArray *indexPaths = #[indexPath];
[self.tableView deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationAutomatic];
[self.toDoItems removeObjectAtIndex:indexPath.row];
}
}
the error message is here:
'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 1. The number of rows contained in an existing section after the update (1003) must be equal to the number of rows contained in that section before the update (1004), plus or minus the number of rows inserted or deleted from that section (0 inserted, 0 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).'
Xcode 6.2 iOS6
I have already tried Deleting table cell causes crash
The problem is that you are deleting the wrong object from your data model:
[self.toDoItems removeObjectAtIndex:indexPath.row];
That's too simple-minded. You have multiple sections in this table. You need a data model that distinguishes these sections, and you need to delete the correct row from the correct section in your data model before deleting the corresponding row from the table. You cannot do that by looking at indexPath.row alone; you need to structure your data model so as to take account of indexPath.section as well.
Related
This question already has answers here:
'Invalid update: invalid number of rows in section 0
(4 answers)
Closed 6 years ago.
emphasized textreason:
Invalid update: invalid number of rows in section 0.
The number of rows contained in an existing section after
the update (5) must be equal to the number of rows contained in
that section before the update (5), 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).
*** First throw call stack
I got this error when I'm trying to delete
This error means that when you update the UITableView after the deletion, the array that you are using as your Data Source has not been updated.
In other words:
You have the NSArray dataArray that you are using in cellForRowAtIndexPath in your UITableViewDelegate.
You animate the cell to delete the row, but then you never call
[dataArray removeObjectAtIndex:index];
So when the table renders again, the UITableView expects there to be 5 items, but your array still has 6.
your question is unclear , follow these steps
in delegate method commitEditingStyle, delete object from array.
then apply deleterow animation on table with updated array.
i think u r not deleting object from your collection i.e array
try this code.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
[tableDataArray removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationFade];
[self.tableView reloadData];
}
}
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the specified item to be editable.
return YES;
}
For More reference You can visit here
I have a UITableViewController set up that displays my managedObjects properly when it's loaded, however when I go to delete a cell my app crashes. This is what the console has to say:
2015-05-03 09:55:20.125 MyApp[9461:663817] *** Terminating app due to
uncaught exception 'NSInternalInconsistencyException', reason: '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).'
When I reboot the app and go to my TVC, the object that I deleted the last time is deleted.
I have sections set up in my NSFetchedResultsController that is instantiated when viewDidLoad is called. I suspect I have a small issue, but I'm not sure where to go to add the missing line(s?).
I enable swipe to delete in viewDidLoad with this line:
// Enable swipe to delete
self.tableView.allowsMultipleSelectionDuringEditing = NO;
Here's my commitEditingStyle:
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete selected NSManagedObject from managedObjectContext
NSManagedObject *objectToDelete = [self.fetchedResultsController objectAtIndexPath:indexPath];
[self.managedObjectContext deleteObject:objectToDelete];
[self.managedObjectContext save:nil];
// Delete the row from the data source
[tableView beginUpdates];
[tableView deleteRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationFade];
[tableView endUpdates];
} else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
Thank you for reading. If you have any ideas, I welcome them.
The error message is saying that number of row returns from numberOfRowInSection is not matching with current number of item in table..
when you use fetchedResultsController numberOfRowsInSection should look something like this.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [[self.fetchedResultsController fetchedObjects] count];
}
and fetchedResultsController delegate didChangeObject: is then called automatically which calls the deleteRowAtIndexPaths: inside.. so you don't need to call the deleteRowAtIndexPaths: just call deleteObject, otherwise it deletes twice.
I have a editable tableView and i cant remove the last object heres my method :
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView beginUpdates];
if (editingStyle == UITableViewCellEditingStyleDelete)
{
[self deletePermittedFriend:[friendsIDs objectAtIndex:indexPath.row]];
[tableDataList removeObjectAtIndex:indexPath.row];
}
[tableView endUpdates];
}
and if the tableDataList MutableArray have only one last object gives me an error :
* Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit/UIKit-2380.17/UITableView.m:1070 2013-05-21
11:41:47.306 EzMall[3398:907] * Terminating app due to uncaught
exception 'NSInternalInconsistencyException', reason: 'Invalid update:
invalid number of rows in section 0. The number of rows contained in
an existing section after the update (0) 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,
0 deleted) and plus or minus the number of rows moved into or out of
that section (0 moved in, 0 moved out).'
It looks that you forgot to call this UITableView method:
– deleteRowsAtIndexPaths:withRowAnimation:
BTW: It is always good practice to read error messages.
Try this
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
[tableDataList removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
[self.tableView beginUpdates];
[self.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath, nil] withRowAnimation:UITableViewRowAnimationAutomatic];
[self.tableView endUpdates];
}
Hi the following function doesn´t work for me and i don´t get why....
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete)
{
// Delete the row from the data source
NSString *selectedCategory = [self.daten objectAtIndex:indexPath.row];
[self.daten removeObjectAtIndex:indexPath.row]; //we assume, that mySourceArray is a NSMutableArray we use as our data source
[self.tableView beginUpdates];
[self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
[self.tableView endUpdates];
// ...
}
}
I don´t have any Sections...I always get that exception:
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (19) must be equal to the number of rows contained in that section before the update (19), 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).'
* First throw call stack:
(0x342692a3 0x33a3b97f 0x3426915d 0x3922e2af 0x36dd5b83 0x5453d 0x36f6b5d9 0x36e8c0ad 0x36e8c05f 0x36e8c03d 0x36e8b8f3 0x36e8c0ad 0x36e8c05f 0x36e8c03d 0x36e8b8f3 0x36e8bde9 0x36db45f9 0x36da1809 0x36da1123 0x34f195a3 0x34f191d3 0x3423e173 0x3423e117 0x3423cf99 0x341afebd 0x341afd49 0x34f182eb 0x36df5301 0x24343 0x38e34b20)
libc++abi.dylib: terminate called throwing an exception
You need to update your number of rows in numberOfRowsInSection: method. As i can see, you need to return your [self.daten count] in this method.
As its told, the system checks this number before/after update/delete to keep data integrity.
You always have a section :)
Implement it like this:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [self.daten count];
}
Also, remember that you need to set both UITableViewDelegate and UITableViewDataSource to self.
OK, the problem is: NSMutableArray's removeObjectAtIndex: method does not resize it. So you have to handle it by yourself. Create new array with right capacity and move the rest of elements to it. You can google how to resize NSMutableArray.
Getting the following error when trying to delete a row from a tableview hooked to a fetched results controller:
* Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/UIKit-1914.84/UITableView.m:1037
2012-07-12 13:11:19.921 Chef[28843:12203] * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (20) must be equal to the number of rows contained in that section before the update (20), 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).'
My code is below.
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the record from the DB
RecipeCategory *objectToBeDeleted = [self.fetchedResultsController objectAtIndexPath:indexPath];
[self.context deleteObject:objectToBeDeleted];
// Delete the row from the data source
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
Using a fetch request count, and the method - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section, I have tried logging the number of DB records, and the number of rows in the table before and after the line [self.context deleteObject:objectToBeDeleted];, and they both decrease from 20 to 19.
Please help!
Edit: PS the error occurs at the deleteRowsAtIndexPath method.
It turns out that the line of code below was surplus to requirements. I guess the NSFetchedResultsController handles that as well. I also had to implement the delegate methods for NSFetchedResultsController.
// Delete the row from the data source
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];