Deleting multiple (not yet loaded) rows in UITableView - iphone

Question

I'm having a bit of trouble trying to delete rows that haven't been loaded (or not visible) from a UITableview.
My setup is as follows -
There are two sections in the tableview and each element in section 1 is associated with multiple elements from section two.
To give you an example (The data isn't really related to what I'm trying to do, but I believe this will be an example that doesn't really require much explanation)
Section 1
BMW
Acura
Merc
Section 2
328i
335i
RX
LX
TX
C300
C550
My internal model goes something like this -
NSMutableArray Cars[]
NSMutableArray Models[]
cars[0] = "BMW"
cars[1] = "Acura"
cars[2] = "Merc"
Each element in Models[] is a vector and their conents are listed below
Models = [ ["328i", "335i"], ["RX", "LX", "TX"], ["C300", "C550"] ];
So for the functionality I'm trying to build. If the user clicks delete and tries to delete BMW, the App needs to remove the entry for BMW from section 1 and the entries for 328i and 335i in section two. However, the user is free to delete any single row of section two independently.
Can anyone point me to a way I can proceed with this?

Answer 1

NSMutableArray *Cars = [[NSMutableArray alloc] initWithObjects:#"BMW",#"Acura",#"Merc",nil];
NSMutableArray *Arr1 = [[NSMutableArray alloc]initWithObjects:#"328i", #"335i",nil];
NSMutableArray *Arr2 = [[NSMutableArray alloc]initWithObjects:#"RX", #"LX", #"TX",nil];
NSMutableArray *Arr3 = [[NSMutableArray alloc]initWithObjects:#"C300", #"C550",nil];
NSMutableArray * Models = [[NSMutableArray alloc] initWithObjects:Arr1,Arr2,Arr3,nil];
On delete if you delete BMW then remove 1st element from Models array and and 1st element from Cars array and reload table.
i.e.
[Cars removeObjectAtIndex:0];
[Models removeObjectAtIndex:0];
[tableview reload]; //tableview - object of UiTableView

Answer 2

- (void)tableView:(UITableView *)tableView
commitEditingStyle:(UITableViewCellEditingStyle)editingStyle
forRowAtIndexPath:(NSIndexPath *)indexPath {
int row = indexPath.row;
if(indexPath.section ==0) {
// Need to remove both the Car and the Models associated with it.
// Begin updates. Doesn't commit edits till endUpdates;
[tableView beginUpdates];
// Get the indexPaths to be removed.
// Cars is straight forward.
NSMutableArray *carsIndexPath = [[NSMutableArray alloc] init];
NSIndexPath *carsIndexPathObj = [NSIndexPath indexPathForRow:indexPath.row inSection:0];
[carsIndexPath addObject:carsIndexPathObj];
// Manually make index paths for models associated with the car.
NSMutableArray *modelIndexPaths = [self getIndexPaths:indexPath.row];
// Now remove from model
[models removeObjectAtIndex:indexPath.row];
[cars removeObjectAtIndex:indexPath.row];
// Remove from Table
[tableView deleteRowsAtIndexPaths:carsIndexPaths withRowAnimation:UITableViewRowAnimationLeft];
[tableView deleteRowsAtIndexPaths:modelIndexPaths withRowAnimation:UITableViewRowAnimationLeft];
// Commit updates
[tableView endUpdates];
// Reload data.
[tableView reloadData];
}
}
-(NSMutableArray *) getIndexPaths:(NSInteger) index {
NSMutableArray *indexPathArray = [[NSMutableArray alloc] init];
int offset = 0;
for (int i=0; i<index; i++) {
NSMutableArray *tempArr = [models objectAtIndex:i];
offset += [tempArr count];
}
NSMutableArray *currentModels = [models objectAtIndex:index];
for (int i=0; i<[currentModels count]; i++) {
NSIndexPath *indexPathTemp = [NSIndexPath indexPathForRow:offset+i inSection:1];
[indexPathArray addObject:indexPathTemp];
}
return indexPathArray;
}
(If this makes any sense at all)