Append string with variable

Question

I'm a java guy coming over to Objective-C. In java, to add a variable to a string you'd have to do something along the lines of:

someString = "This string is equal to " + someNumber + ".";

I can't figure out how to do it in Objective-C though. I have an NSMutableString that I'd like to add to the middle of a string. How do I go about doing this?

I've tried:

NSString *someText = @"Lorem ipsum " + someMutableString;
NSString *someText = @"Lorem ipsum " + [someMutableString stringForm];

and a few other things, none of which seem to work. Also interchanged the +s with ,s.

Rudy Velthuis · Accepted Answer · 2011-08-15 20:08:19Z

30

You can use appendString:, but in general, I prefer:

NSString *someText = [NSString stringWithFormat: @"Lorem ipsum %@", someMutableString];
NSString *someString = [NSString stringWithFormat: @"This is string is equal to %d.", someInt];
NSString *someOtherString = [NSString stringWithFormat: @"This is string is equal to %@.", someNSNumber];

or, alternatively:

NSString *someOtherString = [NSString stringWithFormat: @"This is string is equal to %d.", [someNSNumber intValue]];

etc...

These strings are autoreleased, so take care not to lose their value. If necessary, retain or copy them and release them yourself later.

edited Aug 15, 2011 at 20:08

answered Aug 15, 2011 at 20:02

Rudy Velthuis

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Comments

Louie · Accepted Answer · 2013-04-15 15:56:23Z

8

Try this:

NSMutableString * string1 = [[NSMutableString alloc] initWithString:@"this is my string"];

[string1 appendString:@" with more strings attached"];

//release when done
[string1 release];

edited Apr 15, 2013 at 15:56

answered Aug 15, 2011 at 20:00

Louie

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Comments

uadnal · Accepted Answer · 2011-08-15 20:11:16Z

6

You need to use stringByAppendingString

NSString* string = [[NSString alloc] initWithString:@"some string"];
string = [string stringByAppendingString:@" Sweet!"];

Don't forget to [string release]; when your done of course.

edited Aug 15, 2011 at 20:11

answered Aug 15, 2011 at 20:01

uadnal

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4 Comments

Chuck Over a year ago

Your memory management is messed up. It's the original string created by alloc that you need to release, but you're throwing that away (leaking it) and replacing it with the result of stringByAppendingString:, which should not be released.

uadnal Over a year ago

I realize that I may be confused by memory management here, but isn't my 2nd statement pointing to the same block of memory, in which I am just reassigning the value to the existing value plus the appended string?

Chuck Over a year ago

Nope, it's two different different objects at two different memory locations. Plain NSStrings can't change their value, so stringByAppendingString: returns a new string with the original string's value plus the appended value.

d00dle Over a year ago

Since ARC this would not be a problem anymore?

Rami · Accepted Answer · 2015-08-26 16:52:48Z

0

NSMutableString *string = [[NSMutableString alloc] init];

[string appendFormat:@"more text %@", object ];

edited Aug 26, 2015 at 16:52

Rami

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answered Aug 26, 2015 at 16:26

Jorge Martínez Mauricio

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