Replace "0" with blank character in String

Question

I have a NSString like @"05205" or @"05931" or so. I want to remove the leading 0 characters.

E.g. @"05205" in @"5205" or @"00072" in @"72".

How can I achieve this in Objective-C?

I think you mean to say that you want to remove leading `0` characters. — rmaddy, Aug 28 '13 at 22:24
Where are you getting these? If form a format operation then you can fix that. Otherwise, NSString documents several different ways to remove/blank characters. — Hot Licks, Aug 28 '13 at 22:25
i use a pickerview with 5 numbers and yes i want to remove leading 0 characters :) — Loko, Aug 28 '13 at 22:26

score 7 · Answer 1 · edited Aug 28 '13 at 22:57

7

With the NSStringCompareOptions NSAnchoredSearch, the search is limited to the start of the string, so you can use stringByReplacingOccurrencesOfString:withString:options:range: this way:

NSString* str= @"0072";
str= [str stringByReplacingOccurrencesOfString:@"0"
                                    withString:@""
                                       options:NSAnchoredSearch
                                         range:NSMakeRange(0, str.length)];

edited Aug 28 '13 at 22:57

Gabriele Petronella

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answered Aug 28 '13 at 22:37

Ramy Al Zuhouri

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This is the better, more general answer than the neat trick by rdelmar. – rmaddy Aug 28 '13 at 22:46
yep, really nice. It's basically the equivalent of the `dropWhile` function in – Gabriele Petronella Aug 28 '13 at 22:58

score 6 · Accepted Answer · answered Aug 28 '13 at 22:28

6

If you convert the string to an integer and then back to a string, it will trim the leading zeros.

NSString *s = @"0072";
NSString *newString =[ NSString stringWithFormat:@"%d",[s integerValue]];

answered Aug 28 '13 at 22:28

rdelmar

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+1 clever solution. You can make it even shorter, even though probably less efficient `@(@"0042".integerValue).stringValue` – Gabriele Petronella Aug 28 '13 at 22:28
woooow the answer is perfect !!! :D genius !! – Loko Aug 28 '13 at 22:32
1

I like the answer, but I'd probably go with the widest available type like `%lld` and `[s longLongValue]` (or the unsigned equiv if he knows the values will always be positive) – Jason Coco Aug 28 '13 at 22:33
http://stackoverflow.com/a/10530899/312312 – Lefteris Aug 28 '13 at 23:11

Replace "0" with blank character in String

2 Answers2