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Editorial Team
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Asked: 2026-05-27T03:09:03+00:00

What is this error? I am using mutable type but still it is not

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What is this error? I am using mutable type but still it is not working!

ERROR IS :

Terminating app due to uncaught exception
‘NSInvalidArgumentException’, reason: ‘mutate immutable
object with deleteCharactersInRange:’

NSMutableString *line= [NSMutableString stringWithString:@"here is the string"];
[line deleteCharactersInRange: NSMakeRange(1,9 )];
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1 Answer

  1. Editorial Team

    My new answer:

    With your new code, I added one extra line at the end:

    NSMutableString *line= [NSMutableString stringWithString:@"here is the string"];
[line deleteCharactersInRange: NSMakeRange(1,9 )];
NSLog( @"line is %@", line );

    And the console output was:

    2011-11-25 06:08:13.248 TestingCommandLine[13324:903] line is he string

    No exception thrown. Looks like it’s working for me!

    My original answer (for your original question):

    You can’t delete characters from a line that has nothing in it (hence the exception).

    Do you have any additional code between those two lines of source there? If not, you have a valid NSMutableString… with nothing in it. And you can’t delete anything from a mutable string that has nothing in it.

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