iOS Development Using Swift

Note.swift

//
//  Note.swift
//  Example Notes
//
//  Created by Michael Enger on 21/06/14.
//  Copyright (c) 2014 Michael Enger. All rights reserved.
//

import UIKit
import CoreData

@objc(Note)
class Note: NSManagedObject {
    @NSManaged var content: String
    @NSManaged var created: NSDate

    // #praga mark Instance methods

    func delete() -> Bool
    {
        self.managedObjectContext.deleteObject(self)
        return self.managedObjectContext.save(nil)
    }

    func reset()
    {
        self.managedObjectContext.rollback()
    }

    func save() -> Bool
    {
        return self.managedObjectContext.save(nil)
    }

    // #praga mark Class methods

    class func _context() -> NSManagedObjectContext
    {
        let appDelegate: AppDelegate = (UIApplication.sharedApplication().delegate as AppDelegate)
        return appDelegate.managedObjectContext
    }

    class func _fetch(request: NSFetchRequest) -> NSArray
    {
        let managedObjectModel: NSManagedObjectModel = self._context().persistentStoreCoordinator.managedObjectModel
        return Note._context().executeFetchRequest(request, error:nil) as NSArray
    }

    class func all() -> Note[]
    {
        let request : NSFetchRequest = NSFetchRequest(entityName: "Note")

        request.returnsObjectsAsFaults = false
        request.sortDescriptors = [NSSortDescriptor(key: "content", ascending: true)]

        let results: NSArray = Note._fetch(request)

        var objects: Note[] = []
        for (var i = 0; i < results.count; i++) {
            objects.append(results[i] as Note)
        }

        return objects
    }

    class func create() -> Note
    {
        let object: Note = NSEntityDescription.insertNewObjectForEntityForName("Note", inManagedObjectContext:Note._context()) as Note
        object.created = NSDate.date()
        
        return object
    }
}