Question

I am trying to filter my array with two entities within an object like I have a Person object in which I have name, address, number, email, etc. I am trying to filter my array list of objects with just name and number. How can this be achieved with using NSPredicate?

Answer 1

Create the predicate (the following assumes that your Person class has name and number string properties):

NSString *nameFilter = @"Steve*";
NSString *numberFilter = @"555-*";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"(name like %@) or (number like %@)", nameFilter, numberFilter];

Then, filter the array (this assumes you have an NSArray of Person objects):

NSArray *personArray = /* obtain from somewhere */;
NSArray *filtered = [personArray filteredArrayUsingPredicate:pred];

The result will be an array that contains Person objects whose name could be “Steve”, “Steven” etc, and whose number starts with 555-.

Edit

What you’re saying doesn’t really make sense. You can’t remove properties from a class (or rather, you shouldn’t). If you just want an array that contains only the names and numbers you’ll have to iterate through the array of Person objects:

NSMutableArray *result = [NSMutableArray array];

for (Person *p in personArray)
    [result addObject:[NSString stringWithFormat:"%@ : %@", [p name], [p number]]];