CODEWITHSUNDEEP
objective-ciosnspredicate
quantum
quantum

Reputation: 1420

Using NSPredicate to search an array with an array

I have an array of Card objects (NSObjects), each with a field called tags, which is an NSArray of NSStrings.

I would then like to split up the user's search term into an array called keywords of strings by componentsSeparatedByString, then use NSPredicate to filter my array of Cards based on which elements have tags containing at least 1 keyword in keywords.

I hope that's not too convoluted! I've tried using the NSPredicate IN clause to no avail. How should I do this?

Upvotes: 21

Views: 22524

Answers (2)

Vignesh
Vignesh

Reputation: 10251

Considering array contains card Object. 

 NSArray *keyWordsList = [keywords componentSeparatedByString:@","];
 [array filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"ANY %K IN %@",@"tags",keyWordsList]]

EDIT:

To search partially you can use LIKE operator. 

[array filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"ANY %K LIKE[cd] %@",@"tags",[partialkeyWord stringByAppendingString:@"*"]]]

Upvotes: 62

Paul de Lange
Paul de Lange

Reputation: 10633

Don't kill me if this isn't exactly right, but something like this will work.

NSArray* arrayOfCards = [NSArray array];
NSArray* keywords = [NSArray array];
NSPredicate* containsAKeyword = [NSPredicate predicateWithBlock: ^BOOL(id evaluatedObject, NSDictionary *bindings) {
    Card* card = (Card*)evaluatedObject;
    NSArray* tagArray = card.tags;
    for(NSString* tag in tagArray) {
       if( [keywords containsObject: tag] ) 
          return YES;
    }

    return NO;
}];

NSArray* result = [arrayOfCards filteredArrayUsingPredicate: containsAKeyword];

Upvotes: 9

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