Search for any characters in an NSString

Question

I have the following code to search an NSString:

for (NSDictionary *obj in data) {
        NSString *objQuestion = [obj objectForKey:@"Question"];
        NSRange dataRange = [objQuestion rangeOfString:searchText options:NSCaseInsensitiveSearch];
        if (dataRange.location != NSNotFound) {
            [filteredData addObject:obj];
        }
    }

This works fine, but there is a problem. If objQuestion is: "Green Yellow Red" and I search for "Yellow Green Red", the object will not show up as my search is not in the correct order.

How would I change my code so that no matter what order I search the words in, the object will show?

Answer 1

You should be breaking your search text into words and search each word.

NSArray *wordArray= [searchText componentsSeparatedByString: @" "];
for (NSDictionary *obj in data) {
    NSString *objQuestion = [obj objectForKey:@"Question"];        
    BOOL present = NO;
    for (NSString *s in wordArray) {
        if (s) {                
            NSRange dataRange = [objQuestion rangeOfString:s options:NSCaseInsensitiveSearch];
            if (dataRange.location != NSNotFound) {
               present = YES;
            }
        } 
    }
    if (present) {
        [filteredData addObject:obj];
    }
}