NSString indexOf in Objective-C

Objective CCocoa

Objective C Problem Overview

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

Objective C Solutions

Solution 1 - Objective C

Use -[NSString rangeOfString:]:

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

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

Solution 2 - Objective C

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

Solution 3 - Objective C

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

Solution 4 - Objective C

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

Categories
Recommended Objective C Solutions
Recommended Cocoa Solutions

Previous Solution:

How can I require an optional Perl module if installed?

PerlModuleRequire

Next Solution:

How do you scrape AJAX pages?

AjaxWeb Scraping

Attributions

All content for this solution is sourced from the original question on Stackoverflow.

The content on this page is licensed under the Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionGuidoView Question on Stackoverflow
Solution 1 - Objective CAirsource LtdView Answer on Stackoverflow
Solution 2 - Objective CorafaelreisView Answer on Stackoverflow
Solution 3 - Objective CfirestokeView Answer on Stackoverflow
Solution 4 - Objective CWilliam FalconView Answer on Stackoverflow