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Core Data

  • Core Data
    Core Data from Scratch: Subclassing NSManagedObjectPreview image@2x
    130 shares
    Earlier in this series, we created Done, a simple application to learn more about the NSFetchedResultsController class. In that project, we used key value coding (KVC) and key value observing (KVO) to create and update records. This works fine, but from the moment your project has any kind of complexity, you'll quickly run into issues. Subclassing NSManagedObject makes this much easier.Read More…
  • Core Data
    Core Data from Scratch: MigrationsPreview image@2x
    105 shares
    In the previous articles of this series, we've encountered an annoying issue that we need to address. Whenever we modify the data model of a Core Data application, the persistent store becomes incompatible with the data model. The result is a crash on launch, rendering the application unusable, a serious problem if this happens to an application in the App Store. In this article, we aim to solve this issue by leveraging Core Data migrations.Read More…
  • Core Data
    Core Data from Scratch: More NSFetchedResultsControllerPreview image@2x
    109 shares
    In this tutorial, we continue our exploration of the NSFetchedResultsController class by adding the ability to update and delete to-do items. You'll notice that updating and deleting to-do items is surprisingly easy thanks to the groundwork we laid in the previous tutorial.Read More…
  • Core Data
    Core Data from Scratch: NSFetchedResultsControllerPreview image@2x
    146 shares
    In the previous installments of this series, we covered the fundamentals of the Core Data framework. It's time we put our knowledge to use by building a simple application powered by Core Data. In this tutorial, we'll also meet another star player of the Core Data framework, the NSFetchedResultsController class. The application that we're about to create manages a list of to-do items. With the application, we can add, update, and delete to-do items. You'll quickly learn that the NSFetchedResultsController class makes this very easy to do.Read More…
  • Mobile Development
    Core Data from Scratch: Relationships and More FetchingPreview image@2x
    71 shares
    In the previous article, we learned about NSManagedObject and how easy it is to create, read, update, and delete records using Core Data. However, I didn't mention relationships in that discussion. Aside from a few caveats you need to be aware of, relationships are just as easy to manipulate as attributes. In this article, we will focus on relationships and we'll also continue our exploration of NSFetchRequest.Read More…
  • Mobile Development
    Core Data from Scratch: Managed Objects and Fetch RequestsPreview image@2x
    48 shares
    With everything about Cora Data data models still fresh in your mind, it's time to start working with Core Data. In this article, we meet NSManagedObject, the class you'll interact with most when working with Core Data. In this tutorial, you'll learn how to create, read, update, and delete records. You'll also get to know a few other Core Data classes, such as NSFetchRequest and NSEntityDescription.Read More…
  • Mobile Development
    Core Data from Scratch: Data ModelPreview image@2x
    69 shares
    In the first article of this series, we learned about the Core Data stack, the heart of a Core Data application. We explored the managed object context, the persistent store coordinator, and the managed object model. This article focuses on the data model of a typical Core Data application. We zoom in on Xcode's data model editor and we take a look at entities, attributes, and relationships.Read More…
  • Mobile Development
    Core Data from Scratch: Core Data StackPreview image@2x
    83 shares
    The Core Data framework has been around for many years. It's used in thousands of applications and by millions of people, both on iOS and OS X. Core Data is maintained by Apple and very well documented. In this article, we learn about the Core Data stack, which is at the core of every Core Data application.Read More…
  • iOS SDK
    Data Persistence and Sandboxing on iOSPreview image@2x
    15 shares
    Persisting data across application launches is a requirement that most iOS applications have, from storing user preferences using the user defaults system to managing large datasets in a relational database. In this article, we'll explore the most common strategies used for storing data in an iOS application. I will also talk about the file system on iOS and how application sandboxing affects data persistence.Read More…
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