CoreDataHelper

CoreDataHelper is a tiny Swift Framework that helps you to easily manage CoreData objects in the main context.

Installation

To install this, simply add the .xcodeproj to your project, and do not forget to link the .framework.

If you're using cocoapods, just add pod 'CoreDataHelper' into your Podfile file.

Whenever you want to use it in your code, simply type :

import CoreDataHelper

Getting started

To start with CoreDataHelper, it is pretty simple. Just go to your AppDelegate.swift file and add the following code :

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

  CDHelper.initializeWithMainContext(self.managedObjectContext)
  // OR
  CDHelper.initializeWithMainContext(self.persistentContainer.viewContext) // New XCode 8/Swift 3 template
  
  return true
}

Note that your project must use CoreData.

Create your first entity class

Let's create an entity named User which contains 4 properties :

• first_name (String)
• last_name (String)
• email (String)
• age (Integer)

Once you created the class User which inherit of NSManagedObject, just add the CDHelperEntity protocol like that :

class User: NSManagedObject, CDHelperEntity {
    
  static var entityName: String! { return "User" } // Required
    
  @NSManaged var first_name: String?
  @NSManaged var age: NSNumber?
  @NSManaged var email: String?
  @NSManaged var last_name: String?
}

You just need to add the entityName variable to be conform with the CDHelperEntity protocol and that's it ! You're ready to use all the features of CoreDataHelper !

Play with your entity

Create a new entity

There are two ways to create a new entity. First, you can create an empty entity and fill it after :

let user: User = User.new()
user.first_name = "John"
user.last_name = "Doe"
user.email = "[email protected]"
user.age = 42

You can also create an entity using a data dictionary :

let userData: [String: Any?] = [
  "first_name": "John",
  "last_name": "Doe",
  "email": "[email protected]",
  "age": 42,
]

let user: User = User.new(userData)

Save your entity

To save your entity, simply use the .save() method like that :

let user: User = User.new()
// ...
user.save()

Delete your entity

If you don't need your entity anymore, you can use the .destroy() method :

let user: User = User.new()
// ...
user.save()

// ... Ok, let's admit you want to delete your user
user.destroy()

Retrieve your entities

There are different ways to retrieve your entities.

Synchronously

findAll()

• Basic use

let users: [User] = User.findAll()

• Using sort descriptor(s)

let users: [User] = User.findAll(usingSortDescriptors: [NSSortDescriptor(key: "first_name", ascending: true)])

findOne()

let user: User? = User.findOne("first_name=\"John\"")

find()

• Basic use

let users: [User] = User.find("first_name=\"John\"")

• Using sort descriptor(s)

let users: [User] = User.find("first_name=\"John\"", usingSortDescriptors: [NSSortDescriptor(key: "first_name", ascending: true)])

• Using fetch limit

let users: [User] = User.find("first_name=\"John\"", limit: 5)

• Using both

let users: [User] = User.find("first_name=\"John\"", usingSortDescriptors: [NSSortDescriptor(key: "first_name", ascending: true)], limit: 5)

Asynchronously

asynchronouslyFindAll()

• Basic use

User.asynchronouslyFindAll { (results: [User]) -> Void in
  // ...
}

• Using sort descriptor(s)

User.asynchronouslyFindAll(usingSortDescriptors: [NSSortDescriptor(key: "first_name", ascending: true)]) { (results: [User]) -> Void in
  // ...
}

asynchronouslyFindOne()

User.asynchronouslyFindOne("first_name=\"John\"") { (user: User?) -> Void in
  // ...
}

asynchronouslyFind()

• Basic use

User.asynchronouslyFind("first_name=\"John\"") { (user: [User]) -> Void in
  // ...
}

• Using sort descriptor(s)

User.asynchronouslyFind("first_name=\"John\"", usingSortDescriptors: [NSSortDescriptor(key: "first_name", ascending: true)]) { (user: [User]) -> Void in
  // ...
}

• Using fetch limit

User.asynchronouslyFind("first_name=\"John\"", limit: 5) { (user: [User]) -> Void in
  // ...
}

• Using both

User.asynchronouslyFind("first_name=\"John\"", usingSortDescriptors: [NSSortDescriptor(key: "first_name", ascending: true)], limit: 5) { (user: [User]) -> Void in
  // ...
}