NSString stringWithFormat with tabs instead of spaces

You can see that I add 40 spaces after my string but it starts at index开发者_Go百科 0. Can I do the same thing with tab "\t" instead of spaces " "?

NSString *firstString = [[NSString stringWithFormat:@"%@",stringToWrite] stringByPaddingToLength:40 withString:@" " startingAtIndex:0];

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Yes @"\t" will put tab instead of spaces.
Also, your line could be a bit more simple :

NSString *firstString = [stringToWrite stringByPaddingToLength:40
                                                    withString:@" "
                                               startingAtIndex:0];