Adding cells programmatically on a static UITableView

Question

Hi have a complex storyboard uitableview interface with a lot of custom cells. When a condition is satisfied I need to remove some cells and add others. In particular, in section 1 I have initially 2 cells and when the condition is satisfied I need to remove this two cells and add some cells (for instance 3 or 4 cells, in the code: self.viaggio.tragitto count).

Here is my code:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    switch (section) {
        case 0:
            return 2;
            break;
        case 1:
            if(self.trenoCompilato) return [self.viaggio.tragitto count];
            else return 2;
        case 2:
            if(self.trenoCompilato) return 1;
            else return 0;
        case 3:
            return 1;
        default:
            return 0;
            break;
    }

} 

-(UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{


    if(indexPath.section == 1 && self.trenoCompilato) {

        static NSString *cellIdentifier = @"cellTragitto";

        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];

        if (!cell) {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:cellIdentifier];
        }

        Treno *trenoCell = self.viaggio.tragitto[indexPath.row];

        cell.textLabel.text = [trenoCell stringaDescrizione];
        cell.detailTextLabel.text = [[DateUtils shared] showHHmm:[[DateUtils shared] dateFrom:trenoCell.orarioPartenza]];

        return cell;
    }

    return [super tableView:tableView cellForRowAtIndexPath:indexPath];

}

The condition to display the new cells (they are NOT present in the storyboard) is the boolean self.trenoCompilato

Now. When I do [self.tableview reloadData] when the boolean is TRUE i get:

 *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayI objectAtIndex:]: index 2 beyond bounds [0 .. 1]'
*** First throw call stack:
(
    0   CoreFoundation                      0x00000001102caf35 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x000000010ff63bb7 objc_exception_throw + 45
    2   CoreFoundation                      0x00000001101c301e -[__NSArrayI objectAtIndex:] + 190
    3   UIKit                               0x0000000111134912 -[UITableViewDataSource tableView:indentationLevelForRowAtIndexPath:] + 106
    4   UIKit                               0x0000000110cdf612 __53-[UITableView _configureCellForDisplay:forIndexPath:]_block_invoke + 1704
    5   UIKit                               0x0000000110c605ce +[UIView(Animation) performWithoutAnimation:] + 65
    6   UIKit                               0x0000000110cdef5b -[UITableView _configureCellForDisplay:forIndexPath:] + 312
    7   UIKit                               0x0000000110ce64cc -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 533
    8   UIKit                               0x0000000110cc5fb1 -[UITableView _updateVisibleCellsNow:isRecursive:] + 2846
    9   UIKit                               0x0000000110cdbe3c -[UITableView layoutSubviews] + 213
    10  UIKit                               0x0000000110c68973 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 521
    11  QuartzCore                          0x0000000110a7ade8 -[CALayer layoutSublayers] + 150
    12  QuartzCore                          0x0000000110a6fa0e _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380
    13  QuartzCore                          0x0000000110a6f87e _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
    14  QuartzCore                          0x00000001109dd63e _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 242
    15  QuartzCore                          0x00000001109de74a _ZN2CA11Transaction6commitEv + 390
    16  QuartzCore                          0x00000001109dedb5 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 89
    17  CoreFoundation                      0x00000001101ffdc7 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
    18  CoreFoundation                      0x00000001101ffd20 __CFRunLoopDoObservers + 368
    19  CoreFoundation                      0x00000001101f5b53 __CFRunLoopRun + 1123
    20  CoreFoundation                      0x00000001101f5486 CFRunLoopRunSpecific + 470
    21  GraphicsServices                    0x0000000113c309f0 GSEventRunModal + 161
    22  UIKit                               0x0000000110bef420 UIApplicationMain + 1282
    23  SeguiTreno                          0x000000010f6afa03 main + 115
    24  libdyld.dylib                       0x00000001141bf145 start + 1
    25  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

I have already tried with:

[self.tableView beginUpdates];
[self.tableView deleteRowsAtIndexPaths:deleteIndexPaths withRowAnimation:UITableViewRowAnimationFade];
[self.tableView insertRowsAtIndexPaths:rows withRowAnimation:UITableViewRowAnimationFade];
// inserisco cella con opzione per il cambio soluzione
[self.tableView insertRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:0 inSection:2]] withRowAnimation:UITableViewRowAnimationFade];
[self.tableView endUpdates];

and it still doesn't work.

I tried to add cells in the storyboard and it works! It seems that I can't get more cells than the number is present in the storyboard. What I'm missing?