Database Reference
In-Depth Information
The filter screen is divided into three sections: Price, Most Popular and Sort By.
That last section is not technically made up of “filters,” but sorting usually goes
hand in hand with filters, so we'll leave it like that. :]
Below each price filter is space for the total number of venues that fall into that
price category. Similarly, there's a spot for the total number of deals across all
venues. You'll implement these next.
Returning a count
Open
FilterViewController.swift
and, as always, import the Core Data framework
at the top of the file:
import
CoreData
Then add the following property below the last
@IBOutlet
property:
var
coreDataStack:
CoreDataStack
!
This will hold the
CoreDataStack
object you've been using in the app delegate and in
ViewController.swift
.
Switch to
ViewController.swift
and make the following modification to the already
implemented
prepareForSegue
:
override
func
prepareForSegue(segue:
UIStoryboardSegue
,
sender:
AnyObject
?) {
if
segue.
identifier
==
"toFilterViewController"
{
let
navController = segue.
destinationViewController
as
UINavigationController
let
filterVC = navController.
topViewController
as
FilterViewController
//add the line below
filterVC.
coreDataStack
=
coreDataStack
}
}
The new line of code propagates the
CoreDataStack
object from
ViewController
to
FilterViewController
. The filter screen is now ready to use Core Data.
Go back to
FilterViewController.swift
and add the following lazy property:
lazy
var
cheapVenuePredicate:
NSPredicate
= {
var
predicate =
NSPredicate
(format:
"priceInfo.priceCategory == %@"
,
"$"
)
return
predicate
