Objective-C NSMutableString How to remove leading and trailing spaces?

Question

In Objective-C, how do you removed leading and trailing spaces from an occurrence of NSMutableString?

possible duplicate of [Collapse sequences of white space into a single character](http://stackoverflow.com/questions/758212/collapse-sequences-of-white-space-into-a-single-character) — Larme, Jan 13 '15 at 15:59
@Larme I don't think that's quite a duplicate, as this is just about trimming, but hard to imagine there isn't a duplicate _somewhere_ — jrturton, Jan 13 '15 at 16:06

score 3 · Accepted Answer · edited Jun 03 '17 at 13:47

3

If string is a mutable string:

[string setString:[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]];

edited Jun 03 '17 at 13:47

FD_

answered Jan 13 '15 at 16:06

jrturton

1

Shouldn't `self` be `string`? This doesn't appear to be a category method. – rmaddy Jan 13 '15 at 18:02
Yes, I copied from a comment I made on a category answer! – jrturton Jan 13 '15 at 18:32
Thank you. I found that exact same answer someplace else as well. As is probably obvious, I'm extremely new to Objective-C. – mensasnem Jan 14 '15 at 01:18

score 1 · Answer 2 · answered Jan 13 '15 at 16:04

1

You can use regular expression:

[string replaceOccurrencesOfString:@"(^\\s+)|(\\s+$)" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, [string length])];

answered Jan 13 '15 at 16:04

Rob

Thank you. GREP is a favorite of mine. But didn't know how to use it with mutable strings. – mensasnem Jan 14 '15 at 01:20

2 Answers2