NSPredicate for custom objects not working

Question

I have array of custom objects, _momsArray. shown here is single object of such array:

Custom *yourMom {
  name = @"Sally M. Brown";
  age = 54;
  weight = 43.2;
}

I run my predicate inside searchBar delegate:

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {

    if ([searchText length]<=0) {
        _tableDataArr = [[NSMutableArray alloc] initWithArray:_momsArray];
    } else{

        // filtered _tableDataArr
        NSString *filter = @"name BEGINSWITH[cd] %@";
        NSPredicate* predicate = [NSPredicate predicateWithFormat:filter, searchText];
        NSArray *filteredArr  = [_momsArray filteredArrayUsingPredicate:predicate];
        _tableDataArr = [[NSMutableArray alloc] initWithArray:filteredArr];
    }
    [_momTable reloadData];
}

This doesn't give expected result. For example, when I type S, sally doesn't appear at all. What is wrong with my code?

EDIT: The string in the custom objects contains punctuations and therefore it is not the same as other answers.

Did you try setting a breakpoint to see what goes into filteredArr? — johnyu, Jan 12 '17 at 09:36
Could the punctuations in "name" field causing nspredicate unable to work properly? — GeneCode, Jan 12 '17 at 09:44
@NiravD no I want to search name by first letter. So if I type S, then Sally, Simon, etc should come up. — GeneCode, Jan 12 '17 at 09:52
I think you may need to put your variable inside single quotes, like: `NSPredicate* predicate = [NSPredicate predicateWithFormat: [NSString stringWithFormat: @"name BEGINSWITH[cd] '%@' ", searchText]];` — Rikh, Jan 12 '17 at 09:52
you should check this link http://stackoverflow.com/questions/9558335/filter-an-nsarray-which-contains-custom-objects — Nikunj Damani, Jan 12 '17 at 09:56
Yea the code is working. The changes is not reflected due to my mistake - i load a different array elsewhere onto the cells LOL — GeneCode, Jan 13 '17 at 02:37

dahiya_boy · Answer 1 · 2017-01-12T10:06:27.247

1

Your string is not properly generated so use below code :

NSPredicate *predicate = [ NSPredicate predicateWithFormat:@"SELF beginswith[c] %@", text];
arrFilterData = [NSArray arrayWithArray:[arrDataList filteredArrayUsingPredicate:predicate]];

OUTPUT

Before search

After search

And with code

NSPredicate *predicate = [ NSPredicate predicateWithFormat:@"SELF CONTAINS[c] %@", text];
arrFilterData = [NSArray arrayWithArray:[arrDataList filteredArrayUsingPredicate:predicate]];

OutPut:

Edit

Output :

edited Jan 12 '17 at 10:06

answered Jan 12 '17 at 09:37

dahiya_boy

9,298
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This make my app crash. – GeneCode Jan 12 '17 at 09:41
what is the crash reason? – dahiya_boy Jan 12 '17 at 09:45
That is not my question is it? Yours is just simple array of strings. mine are array of custom objects. Try put some dots in your string array see if that still works. – GeneCode Jan 12 '17 at 09:56
It is a custom array where I am picking just name like `Sally` – dahiya_boy Jan 12 '17 at 09:58
Put some dots in your Peacock string, like Pea.cock. Then try it. – GeneCode Jan 12 '17 at 09:59
your code is fine and correct, but it is used for arrays search not array of dictionary search, better modify your answer – Anbu.Karthik Jan 12 '17 at 10:17
@Anbu.Karthik My answer is in multiple format, but my code work is not working is his system. As he is saying my code crashes his project. I still don't know how.! :( – dahiya_boy Jan 12 '17 at 10:20
OMG. Your initial answer DID cause my app to crash! The edited answer are simply the same as mine. – GeneCode Jan 13 '17 at 03:08

Sunny · Accepted Answer · 2017-01-12T10:04:38.303

1

To filter an array with custom objects you can use this code.

NSString *str = @"text";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self.name contains[c] %@", str];
NSArray *arrFiltered = [self.arrDataObject filteredArrayUsingPredicate:predicate];

Hope, it helps.

edited Jan 12 '17 at 10:04

answered Jan 12 '17 at 09:59

Sunny

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score 0 · Answer 3 · answered Jan 12 '17 at 10:13

0

Use this code :

NSPredicate *pred = [NSPredicate predicateWithFormat:@"name CONTAINS[cd] %@", searchText];
NSMutableArray *filteredArr = [[_momsArray filteredArrayUsingPredicate:pred]mutableCopy];

answered Jan 12 '17 at 10:13

Niharika

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NSPredicate for custom objects not working

3 Answers3