This code syntax might help you check that it's working. Then you'll probably see as Matthias said that the issue is coming from your isFriend:
method because your code looks fine for me.
Or another way, I think it's cleaner to separate the two logics of selecting/deselecting, so don't forget to enable the "multiple selection" on the tableview :
self.tableView.allowsMultipleSelection = YES;
And on the tableview delegate :
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryNone;
}
Then to retrieve all selected items :
- (void)handleSelectedItems
{
NSArray *selectedItemIndexPaths = [self.tableView indexPathsForSelectedRows];
for (NSIndexPath *indexPath in selectedItemIndexPaths) {
PFUser *user = [self.allUsers objectAtIndex:indexPath.row];
// do what you want
// ...
}
}