I want to place a string within a string. Basically in pseudo code:
"first part of string" + "(varying string)" + "third part of string" How can I do this in objective-c? Is there a way to easily concatenate in obj-c? Thanks!
7 Answers
Yes, do
NSString *str = [NSString stringWithFormat: @"first part %@ second part", varyingString]; For concatenation you can use stringByAppendingString
NSString *str = @"hello "; str = [str stringByAppendingString:@"world"]; //str is now "hello world" For multiple strings
NSString *varyingString1 = @"hello"; NSString *varyingString2 = @"world"; NSString *str = [NSString stringWithFormat: @"%@ %@", varyingString1, varyingString2]; //str is now "hello world" 
1 Comment
jsttn
Would this work for numerous strings? Like have several %@ and do varyingString, varyingString2?
Variations on a theme:
NSString *varying = @"whatever it is"; NSString *final = [NSString stringWithFormat:@"first part %@ third part", varying]; NSString *varying = @"whatever it is"; NSString *final = [[@"first part" stringByAppendingString:varying] stringByAppendingString:@"second part"]; NSMutableString *final = [NSMutableString stringWithString:@"first part"]; [final appendFormat:@"%@ third part", varying]; NSMutableString *final = [NSMutableString stringWithString:@"first part"]; [final appendString:varying]; [final appendString:@"third part"]; Comments
NSString * varyingString = ...; NSString * cat = [NSString stringWithFormat:@"%s%@%@", "first part of string", varyingString, @"third part of string"]; or simply -[NSString stringByAppendingString:]
Comments
You would normally use -stringWithFormat here.
NSString *myString = [NSString stringWithFormat:@"%@%@%@", @"some text", stringVariable, @"some more text"]; 
1 Comment
JoeTavarez
This is really the best way when you have a large string that you are building for let's say an XML.
Iam amazed that none of the top answers pointed out that under recent Objective-C versions (after they added literals), you can concatenate just like this:
@"first" @"second" And it will result in:
@"firstsecond" You can not use it with NSString objects, only with literals, but it can be useful in some cases.
Comments
Just do
NSString* newString=[NSString stringWithFormat:@"first part of string (%@) third part of string", @"foo"]; This gives you
@"first part of string (foo) third part of string" 
Comments
simple one:
[[@"first" stringByAppendingString:@"second"] stringByAppendingString:@"third"]; if you have many STRINGS to Concatenate, you should use NSMutableString for better performance
[NSString stringWithFormat:@"Just google '%@'!", @"http://www.google.hu/search?q=nsstring+class+reference&ie=UTF-8&oe=UTF-8&hl=en-gb&client=safari"];