What is NSFetchedResultsController?
A controller that you use to manage the results of a Core Data fetch request and to display data to the user.
What is core data in iOS Swift?
Core Data is an object graph and persistence framework provided by Apple in the macOS and iOS operating systems. It was introduced in Mac OS X 10.4 Tiger and iOS with iPhone SDK 3.0. It allows data organized by the relational entity–attribute model to be serialized into XML, binary, or SQLite stores.
What is the best way to improve Core Data performance?
Three Tips To Improve Core Data Performance
- Be Careful What You Ask For. Core Data is a highly optimized persistence framework.
- Don’t Block the Main Thread. If the main thread of your application is blocked, even for a brief moment, the user experiences this as your application being unresponsive.
- Binary Large Objects.
What is NSManagedObjectContext Objective C?
An object space to manipulate and track changes to managed objects.
What is crud in Swift?
Core Data is an object graph and persistence framework provided by Apple in the iOS and macOS operating system. It allows data organized by the relation entity-attribute model to be serialized into XML, binary, or SQLite stores.
What is new in Core Data?
See how you can easily and automatically include your data in Spotlight to allow users to find content even if it’s stored in Core Data. Learn about new options for indexing your data, and hear the details on a new feature for tracking changes over time.
What is context Core Data?
From your perspective, the context is the central object in the Core Data stack. It’s the object you use to create and fetch managed objects, and to manage undo and redo operations. Within a given context, there is at most one managed object to represent any given record in a persistent store.
How does the nsfetchedresultscontroller respond to changes at the model layer?
In general, NSFetchedResultsController is designed to respond to changes at the model layer, by informing its delegate when result objects change location or when sections are modified. If you allow a user to reorder table rows, then your implementation of the delegate methods must take this into account—see NSFetchedResultsControllerDelegate.
What is a fetched results controller in Salesforce?
A controller that you use to manage the results of a Core Data fetch request and to display data to the user. While table views can be used in several ways, fetched results controllers primarily assist you with a primary list view. UITableView expects its data source to provide cells as an array of sections made up of rows.
What happens when I set a delegate for a fetched results controller?
If you set a delegate for a fetched results controller, the controller registers to receive change notifications from its managed object context. Any change in the context that affects the result set or section information is processed and the results are updated accordingly.
What are the four parameters of the fetch results controller?
When you initialize the fetch results controller, you provide four parameters: A fetch request. This must contain at least one sort descriptor to order the results. A managed object context. The controller uses this context to execute the fetch request. Optionally, a key path on result objects that returns the section name.