CODEWITHSUNDEEP
iphoneobjective-cnsstring
user594161
user594161

Reputation:

How to truncate NSString?

I looked at the string formatting documents but couldn't figure out exactly how to do this.

Lets say I have a sting like this

@"(01–05) Operations on the nervous system"

I want to create 2 strings from this like so:

@"01-05" and @"Operations on the nervous system"

How can I do this?

Here are the docs I looked at: http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Strings/Articles/FormatStrings.html

Upvotes: 2

Views: 1505

Answers (3)

user887210
user887210

Reputation:

If you just want the first substring contained by the characters "(" and ")" and anything after that I'd recommend doing something like this:

NSString *original = @"(01–05) Operations on the nervous system";
NSString *firstPart = [NSString string];
NSString *secondPart = [NSString string];
NSScanner *scanner = [NSScanner scannerWithString:original];

[scanner scanUpToString:@"(" intoString:NULL];           // find first "("
if (![scanner isAtEnd]) {
    [scanner scanString:@"(" intoString:NULL];           // consume "("
    [scanner scanUpToString:@")" intoString:&firstPart]; // store characters up to the next ")"
    if (![scanner isAtEnd]) {
        [scanner scanString:@")" intoString:NULL];       // consume ")"

        // grab the rest of the string
        secondPart = [[scanner string] substringFromIndex:[scanner scanLocation]];
    }
}

Of course the secondPart string will still have spaces and whatnot at the front of it, to get rid of those you can do something along the lines of:

secondPart = [secondPart stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet];

The advantage of using NSScanner is that you don't have to hard-code the start and end of the firstPart substring.

Upvotes: 2

Louie
Louie

Reputation: 5940

Give this a shot. It might be off a bit, I havent checked for typos. But you can mess around with it now that you get the idea.

NSString * sourceString = @"(01–05) Operations on the nervous system";

NSString *string1 = [sourceString substringToIndex:6];
string1 = [string1 stringByReplacingOccurrencesOfString:@"(" withString:@""];

//string1 = 01-05

NSString *string2 =[sourceString substringFromIndex:7];

//string2 = Operations on the nervous system

Upvotes: 2

Arvin Am
Arvin Am

Reputation: 533

NSString *theFirstStringSubString = [NSString substringFromIndex:1];

NSString *theFirstStringSecondSubstring = [theFirstStringSubString substringToIndex:6];

Now theFirstStringSecondSubstring is 01-05 same thing for the other but at different indexes. Please note that these are strings that are autoreleased. If you want to keep them, retain it.

Upvotes: 1

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