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iPad: Iterate over every cell in a UITableView?
for (int section = 0; section < [tableView numberOfSections]; section++) {
    for (int row = 0; row < [tableView numberOfRowsInSection:section]; row++) {
        NSIndexPath* cellPath = [NSIndexPath indexPathForRow:row inSection:section];
        UITableViewCell* cell = [tableView cellForRowAtIndexPath:cellPath];
        //do stuff with 'cell'
    }
}

for (UITableViewCell *cell in self.tableView.visibleCells) {
    NSIndexPath *cellIndexPath = [self.tableView indexPathForCell:cell];

UITableViewCell *cell;
NSIndexPath indexPath = [[NSIndexPath indexPathForRow:0 inSection:0];
for(indexPath.section = 0; indexPath.section < [myTableView numberOfSections]; ++indexPath.section)
{
    for(indexPath.row = 0; indexPath.row < [myTableView numberOfRowsInSection:indexPath.section]; ++indexPath.row)
    {
        cell = [myTableView cellForRowAtIndexPath:indexPath];
        // do something with this cell
    }
}

- (void)enumerateCellsUsingBlock:(void (^)(UITableViewCell *cell))cellBlock {
    for (int section = 0; section < [self numberOfSections]; section++) {
        for (int row = 0; row < [self numberOfRowsInSection:section]; row++) {
            NSIndexPath *cellPath = [NSIndexPath indexPathForRow:row inSection:section];
            UITableViewCell *cell = [self cellForRowAtIndexPath:cellPath];
            cellBlock(cell);
        }
    }
}

[self.tableView enumerateCellsUsingBlock:^(UITableViewCell *cell) {
    NSLog(@"cell:%@", cell);
}];