nsnumber

Now this must be easy, but how can sum two NSNumber ? Is like: [one floatValue] + [two floatValue] or exist a better way? Louis Gerbarg There is not really a better way, but you really should not be doing this if you can avoid it. NSNumber exists as a wrapper to scalar numbers so you can store them in collections and pass them polymorphically with other NSObjects . They are not really used to store numbers in actual math. If you do math on them it is much slower than performing the operation on just the scalars, which is probably why there are no convenience methods for it. For example:

So I have an NSArray "myArray" with NSNumber s and NSString s. I need them in another UIView so i go like this: - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { DetailViewController *details = [[DetailViewController alloc] initWithNibName:@"DetailView" bundle:nil]; details.subjectText = [[myArray objectAtIndex:indexPath.row] objectForKey:@"subject"]; The subjectText works. But how can I get the NSNumber s out of it? (I actually need them as strings...) I would convert a NSString out of a NSNumber like this: NSString *blah = [NSNumber intValue] . But