Sorted arrays doesn't delete what I want

Sorted arrays doesn't delete what I want

I have a sorted NSMutableArray which works perfectly and all though when I
try to delete an object it crashes the app then when I reload the app it
didn't delete the right one.
I known that is due to the fact that this is now a sorted array because
before I implemented this feature it worked fine though I haven't got a
clue of how to fix it.
Here is the code I use to delete things from the array:
- (void) tableView:(UITableView *)tv
commitEditingStyle:(UITableViewCellEditingStyle)editingStyle
forRowAtIndexPath:(NSIndexPath *)indexPath {
if ( editingStyle == UITableViewCellEditingStyleDelete ) {
Patient *thisPatient = [patients objectAtIndex:indexPath.row];
[patients removeObjectAtIndex:indexPath.row];
if (patients.count == 0) {
[super setEditing:NO animated:YES];
[self.tableView setEditing:NO animated:YES];
}
[self deletePatientFromDatabase:thisPatient.patientid];
[tv deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
withRowAnimation:UITableViewRowAnimationLeft];
}
}
It is being stopped at this line:
[tv deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
withRowAnimation:UITableViewRowAnimationLeft];
Here is the code that I use for sorting the array:
-(void) processForTableView:(NSMutableArray *)items {
for (Patient *thisPatient in items) {
NSString *firstCharacter = [thisPatient.patientName
substringToIndex:1];
if (![charIndex containsObject:firstCharacter]) {
[charIndex addObject:firstCharacter];
[charCount setObject:[NSNumber numberWithInt:1]
forKey:firstCharacter];
} else {
[charCount setObject:[NSNumber numberWithInt:[[charCount
objectForKey:firstCharacter] intValue] + 1]
forKey:firstCharacter];
}
}
charIndex = (NSMutableArray *) [charIndex
sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
}
- (UITableViewCell *)tableView:(UITableView *)tv
cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tv dequeueReusableCellWithIdentifier:@"cell"];
NSString *letter = [charIndex objectAtIndex:[indexPath section]];
NSPredicate *search = [NSPredicate predicateWithFormat:@"patientName
beginswith[cd] %@", letter];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc]
initWithKey:@"patientName" ascending:YES];
NSArray *filteredArray = [[patients filteredArrayUsingPredicate:search]
sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
if ( nil == cell ) {
cell = [[UITableViewCell alloc]
initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];
}
NSLog(@"indexPath.row = %d, patients.count = %d", indexPath.row,
patients.count);
Patient *thisPatient = [filteredArray objectAtIndex:[indexPath row]];
cell.textLabel.text = [NSString stringWithFormat:@"%@ %@",
thisPatient.patientName, thisPatient.patientSurname];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
cell.textLabel.textColor = [UIColor blackColor];
if (self.editing) {
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
}
return cell;
}
I suspect this is quite a common thing that happens when you sort an array
though it may not be.
Please say if you want any more code