CODEWITHSUNDEEP
iosobjective-cparse-platformpfquery
Kevin Pimentel
Kevin Pimentel

Reputation: 1916

IOS Parse How to search an array of strings for a substring?

I am using a parse database to store some records. I am storing an array of strings and I want to be able to search this array for substrings. Here is an example:

Array A:

["carbrown","blue","house","coldturkey"]

Array B:

["racecar","green","walking"]

Array C:

["greenturkey","users","published","ramp"]

I want to be able to search for a substring like car and get Arrays A and B as matching results, Or searching for turkey gives me matching results with arrays A and C, Or green gives me Arrays B and C, and so on..

I know that for strings you can use this in parse:

- (void)whereKey:(NSString *)key containsString:(NSString *)substring

Is this possible with arrays, maybe something with regex?

Upvotes: 2

Views: 894

Answers (1)

gabbler
gabbler

Reputation: 13766

You can use NSPredicate for this purpose. The following is an example.

NSArray *a = @[@"carbrown",@"blue",@"house",@"coldturkey"];
NSArray *b = @[@"racecar",@"green",@"walking"];
NSArray *c = @[@"greenturkey",@"users",@"published",@"ramp"];

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF contains[cd] %@", @"car"];
NSArray *filteredArrayA = [a filteredArrayUsingPredicate:predicate];
NSArray *filteredArrayB = [b filteredArrayUsingPredicate:predicate];
NSArray *filteredArrayC = [c filteredArrayUsingPredicate:predicate];

if ([filteredArrayA count]) {
    NSLog(@"A has car in it");
}

Upvotes: 2

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