how to delete items from NSArray to create a filtered array (NSPredicate)

Question

I got a NSArray that i m fetching from my database and i was using kinda brute force solution where i needed to modify the content of my database for each element. I was using this NSPredicate to filter my array

NSArray *array = [haveIngArray filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"ANY %@ contains[cd] self", recipeIngredientsArray]];

where recipeIngredientArray are the input came from user and haveIngArray are the fetched content.

this is a sample of the content of my database

1 piece of chicken breast
3 spoon of wheat
6 glass of water
1 can of corn
1 glass of lemon juice
salt

i will compare the inputs with the content came from database but i don't need to compare certain things like salt, water,pepper. How can i delete these from my array so i can use my real filter?

I tried to use NSPredicate with contain and delete the same objects from the original array but that cause performance issues.

Answer 1

Hop This help you ... Just get your DB into MutableArray, then filter it by any words you want

//enter the words you want to filter by
NSArray *filterArray = @[@"water",@"salt"];

NSArray *dataBaseArray = @[@"1 piece of chicken breast", @"3 spoon of wheat", @"6 glass of water", @"1 can of corn", @"1 glass of lemon juice",@"1 piece of chicken breast", @"3 spoon of wheat", @"6 glass of water", @"1 can of corn", @"1 glass of lemon juice"];

// this is the array that get the records from the DB
NSMutableArray *tempArray = [[NSMutableArray alloc]init];
for (int i=0; i <dataBaseArray.count; i++) {

    NSString *str = dataBaseArray[i];
    BOOL found = NO;
    for (NSString *word in filterArray) {

        if ([str rangeOfString:word].location != NSNotFound)
        {
            found = YES;
        }
    }
    if (!found) {
        [tempArray addObject:str];
    }

}

dataBaseArray = [[NSArray alloc]initWithArray:tempArray];