Determines NSString has URL in it, returns extracted URLs with duplicates removed.

NSString+URLDetect.h

#import <Foundation/Foundation.h>

@interface NSString (URLDetect)
-(BOOL)hasURLs;
-(NSArray *)componentsByDetectedURLs;
@end

NSString+URLDetect.m

#import "NSString+URLDetect.h"

@implementation NSString (URLDetect)

-(BOOL)hasURLs
{
	return [[self componentsByDetectedURLs] count] > 0;
}

-(NSArray *)componentsByDetectedURLs
{
	NSMutableArray *urls = [NSMutableArray new];
	NSDataDetector *detector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:nil];
	NSArray *matches = [detector matchesInString:self options:0 range:NSMakeRange(0, [self length])];
	
	for (NSTextCheckingResult *match in matches) 
	{
		if ([match resultType] == NSTextCheckingTypeLink) 
		{
			NSString *url = [[match URL] absoluteString];
			
			if ([urls indexOfObject:url] == NSNotFound)
			{
				[urls addObject:url];
			}
		}
	}
	
	return urls;
}

@end