Sorting array derived from Core Data in Swift

I have NSManagedObject

my own class ( BPMonitor

) for my object - BPMonitor

:

import UIKit
import CoreData

@objc(BPMonitor)
class BPMonitor: NSManagedObject {
    @NSManaged var sisPress: String
    @NSManaged var diaPress: String
    @NSManaged var hbPress: String
    @NSManaged var datePress: NSDate
}

      

        
        
        
      

    

In code, I am getting data from Core Data into an array:

var results:[BPMonitor]=[]
...
...

      

        
        
        
      

    

How can I sort the array for field datePress

( NSDate

) in descending order?