CODEWITHSUNDEEP
objective-ccocoa
Guido
Guido

Reputation: 47675

NSString indexOf in Objective-C

Is there anything similar to an indexOf function in the NSString objects?

Upvotes: 56

Views: 61272

Answers (4)

William Falcon
William Falcon

Reputation: 9813

I know it's late, but I added a category that implements this method and many others similar to javascript string methods
https://github.com/williamFalcon/WF-iOS-Categories

Upvotes: 1

orafaelreis
orafaelreis

Reputation: 2881

If you want just know when String a contains String b use my way to do this.

#define contains(str1, str2) ([str1 rangeOfString: str2 ].location != NSNotFound)

//using 
NSString a = @"PUC MINAS - BRAZIL";

NSString b = @"BRAZIL";

if( contains(a,b) ){
    //TO DO HERE
}

This is less readable but improves performance

Upvotes: 29

firestoke
firestoke

Reputation: 1059

I wrote a category to extend original NSString object. Maybe you guys can reference it. (You also can see the article in my blog too.)

ExtendNSString.h:

#import <Foundation/Foundation.h>

@interface NSString (util)

- (int) indexOf:(NSString *)text;

@end

ExtendNSStriing.m:

#import "ExtendNSString.h"

@implementation NSString (util)

- (int) indexOf:(NSString *)text {
    NSRange range = [self rangeOfString:text];
    if ( range.length > 0 ) {
        return range.location;
    } else {
        return -1;
    }
}

@end

Upvotes: 19

Airsource Ltd
Airsource Ltd

Reputation: 32622

Use -[NSString rangeOfString:]:

- (NSRange)rangeOfString:(NSString *)aString;

Finds and returns the range of the first occurrence of a given string within the receiver.

Upvotes: 91

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