Replacing one character in a string in Objective-C

Question

Hoping somebody can help me out - I would like to replace a certain character in a string and am wondering what is the best way to do this?

I know the location of the character, so for example, if I want to change the 3rd character in a string from A to B - how would I code that?

http://stackoverflow.com/questions/1778227/string-manipulation-in-objective-c — Greg Flynn, Mar 07 '11 at 18:45
Here is simple method that can do your work.Have a try.http://stackoverflow.com/questions/8953044/replace-a-character-at-a-certain-index-in-nsstring/24860376#24860376 — Tunvir Rahman Tusher, Jul 26 '14 at 07:08

score 91 · Accepted Answer · edited Jul 02 '17 at 07:02

91

If it is always the same character you can use:

stringByReplacingOccurrencesOfString:withString:

If it is the same string in the same location you can use:

stringByReplacingOccurrencesOfString:withString:options:range:

If is just a specific location you can use:

stringByReplacingCharactersInRange:withString:

Documentation here: https://developer.apple.com/documentation/foundation/nsstring

So for example:

NSString *someText = @"Goat";
NSRange range = NSMakeRange(0,1);
NSString *newText = [someText stringByReplacingCharactersInRange:range withString:@"B"];

newText would equal "Boat"

edited Jul 02 '17 at 07:02

Cœur

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answered Mar 07 '11 at 18:44

theChrisKent

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Thanks for adding the code example. For others who may be wondering, the '0' in NSMakeRange is the character's position, and the '1' is the length starting at character 0 that you wish to replace - so to replace the first character you do (0,1) to replace the third character you do (2,1) and so forth. Thanks!! – RanLearns Mar 07 '11 at 19:22

score 31 · Answer 2 · answered Oct 02 '14 at 07:20

31

NSString *str = @"123*abc";
str = [str stringByReplacingOccurrencesOfString:@"*" withString:@""];
//str now 123abc

answered Oct 02 '14 at 07:20

MaxEcho

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score 7 · Answer 3 · edited Nov 19 '11 at 01:02

7

Here is the code:

[aString stringByReplacingCharactersInRange:NSMakeRange(3,1) withString:@"B"];

edited Nov 19 '11 at 01:02

Duncan Babbage

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answered Mar 07 '11 at 18:46

Zakaria

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+0.5 because code is king, but this will replace the wrong letter ^^ – Matthias Bauch Mar 07 '11 at 18:49
@fluchtpunkt: Thanks. But this is just an example. – Zakaria Mar 07 '11 at 18:51
2

It does what you wanted now. ;) – Duncan Babbage Nov 19 '11 at 00:43

score 5 · Answer 4 · edited Dec 16 '11 at 11:22

5

Use the replaceCharactersInRange: withString: message on a NSMutableString object.

edited Dec 16 '11 at 11:22

Luke

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answered Mar 07 '11 at 18:46

Bourne

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Replacing one character in a string in Objective-C

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