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Core Data

  • Core Data
    iOS 8: Core Data and Asynchronous FetchingPreviewimage@2x
    178 shares
    In the previous article about iOS 8 and Core Data, we discussed batch updates. Batch updates aren't the only new API in town. As of iOS 8 and OS X Yosemite, it's possible to asynchronously fetch data. In this tutorial, we'll take a closer look at how to implement asynchronous fetching and in what situations your application can benefit from this new API.Read More…
  • Core Data
    iOS 8: Core Data and Batch UpdatesPreviewimage@2x
    126 shares
    Core Data has been around for many years on OS X and it didn't take Apple long to bring it to iOS. Even though the framework doesn't get as much attention as extensions or handoff, it continues to evolve year over year, and this year, with the release of iOS 8 and OS X Yosemite, is no different. Apple introduced a few new features to the Core Data framework, but the most notable are batch updates and asynchronous fetching. Developers have been asking for these features for many years and Apple finally found a way to integrate them into Core Data. In this tutorial, I will show you how batch updates work and what they mean for the Core Data framework.Read More…
  • Core Data
    Core Data from Scratch: ConcurrencyPreview image@2x
    138 shares
    If you're developing a small or simple application, then you probably don't see the benefit of running Core Data operations in the background. However, what would happen if you imported hundreds or thousands of records on the main thread during the first launch of your application? The consequences could be dramatic. For example, your application could be killed by Apple's watchdog for taking too long to launch. In this article, we take a look at the dangers when using Core Data on multiple threads and we explore several solutions to tackle the problem.Read More…
  • Core Data
    Core Data from Scratch: Subclassing NSManagedObjectPreview image@2x
    131 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
    109 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
    72 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
    47 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
    89 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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