String Functions - inserting a character into a string

[DragonTech]

Hi (and thanks in advance for any assistance on this!)

I am new to iPhone SDK, but not to programming.

I have searched the iPhone SDK reference docs and Google, etc. and I can’t find the string functions or any examples to do the following:

I would like to insert a character at a specified spot in a string (i.e. 2 characters from the end of the string):


Ex) if you started with the following text “mystring” I would like to insert an underscore character“_” two characters from the end of the string. So that “mystring” would be changed to “mystri_ng”

Also, if anyone has a link to a quick reference of string manipulation functions and examples it would be greatly appreciated!

String Length
String Left (string, count)
String Right (string, count)
String Concatenation
Etc.

Thanks!

[wuf810]

Originally Posted by DragonTech

Hi (and thanks in advance for any assistance on this!)

I am new to iPhone SDK, but not to programming.

I have searched the iPhone SDK reference docs and Google, etc. and I can’t find the string functions or any examples to do the following:

I would like to insert a character at a specified spot in a string (i.e. 2 characters from the end of the string):


Ex) if you started with the following text “mystring” I would like to insert an underscore character“_” two characters from the end of the string. So that “mystring” would be changed to “mystri_ng”

Also, if anyone has a link to a quick reference of string manipulation functions and examples it would be greatly appreciated!

String Length
String Left (string, count)
String Right (string, count)
String Concatenation
Etc.

Thanks!

Check out the NSString documentation in xCode. All the methods are there to enable you to manipulate your string...not sure if there is an Insert method but there is definitely substring and appendstring methods that will help with what you are trying to achieve.

Regards, M.

[coulls]

Originally Posted by DragonTech

String Length
String Left (string, count)
String Right (string, count)
String Concatenation
Etc.
Thanks!

OK, There's a lot of documentation here, that will be of help:
NSString Class Reference

To give you a quick idea (I'm writing on a PC looking at the above docs, so this may need a tweak - but it should still help point you in the right direction)

//Create a string.
NSString *myString = [[NSString alloc] init];
myString = @"some string text.";

//Get string length.
val = [myString length];

//Append strings.
NSString *stringOne = [[NSString alloc] init];
NSString *stringTwo = [[NSString alloc] init];
stringOne = @"some string text.";
stringTwo = @" Some more string text";
stringone = [stringOne stringByAppendingString:stringTwo];

//Clearing up after yourself (very import if you alloc).
[stringOne release];
[stringTwo release];

Hope that helps.

[DragonTech]

Thanks for the quick replies Wuf810 & Coulls -

this was enough info to get me on the right path. I will post my solution to this example shortly, in case anyone else has a similar question.

[coulls]

Originally Posted by DragonTech

Thanks for the quick replies Wuf810 & Coulls -

this was enough info to get me on the right path. I will post my solution to this example shortly, in case anyone else has a similar question.

Just had a late thought: If a string needs to be edited after creation, you may need to use NSMutableString instead of NSString.

EDIT: Found your insertion routine:
http://developer.apple.com/documenta...Reference.html
Look for "insertString:atIndex", which allows you to insert one string inside another at a specified position.

[DragonTech]

This solution worked in the iPhone simulator 2.2:

NSString *myString = [[NSString alloc] init];
NSString *myStringPrt1 = [[NSString alloc] init];
NSString *myStringPrt2 = [[NSString alloc] init];
NSString *combinedString = [[NSString alloc] init];


myString = @"mystring";

//Get string length
int myStringLen = [myString length];

//Get first part of the string minus the last two characters
myStringPrt1 = [myString substringWithRange:NSMakeRange(0,myStringLen-2)];

//get the last two characters of the string
myStringPrt2 = [myString substringFromIndex:myStringLen-2];

//add the underscore to the end of string part 1
combinedString = [myStringPrt1 stringByAppendingString:@"_"];

//add the last two characters to the string after the underscore
combinedString = [combinedString stringByAppendingString:myStringPrt2];


RESULT: "mystri_ng"

Thanks to all for the help on this. I hope this helps out anyone else trying to do this type of thing.