How does NSFetchedResultsController work?
How does NSFetchedResultsController work?
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.
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 Nsfetchrequest in Swift?
A description of search criteria used to retrieve data from a persistent store. iOS 3.0+
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 Nsmanagedobjectcontext?
An object space to manipulate and track changes to managed objects. iOS 3.0+
When should I use Core Data?
Here is Apple’s quick overview: “Use Core Data to save your application’s permanent data for offline use, to cache temporary data, and to add undo functionality to your app on a single device.” To give a bit more detail, CoreData is Apple’s technology to save your structured data locally.
Is Core Data slow?
Use a parent context for background saving. Also, quitting apps does virtually nothing to speed things up.
What is Nsmanagedobjectid in Swift?
A compact, universal identifier for a managed object. iOS 3.0+
What is NSEntityDescription in Swift?
You usually define entities in a Managed object modelusing the data modeling tool in Xcode. Like the other major modeling classes, NSEntityDescription provides you with a user dictionary in which you can store any application-specific information related to the entity.
What is MVC in Swift?
Model-View-Controller, or MVC for short, is a widely used design pattern for architecting software applications. Cocoa applications are centered around MVC and many of Apple’s frameworks are impregnated by the pattern. The settings view is an important component of the application. …
What is difference between Core Data and SQLite in iOS?
The most important difference between Core Data and SQLite is that SQLite is a database while Core Data is not. Core Data can use SQLite as its persistent store, but the framework itself is not a database. Core Data is not a database. Core Data is a framework for managing an object graph.
What is persistent store coordinator?
A persistent store coordinator is an instance of NSPersistentStoreCoordinator . It has a reference to a managed object model that describes the entities in the store or stores it manages. The coordinator is the central object in a Core Data stack.
What is a fetched results controller?
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.
How does the nsfetchedresultscontroller cache data?
When you initialize an instance of NSFetchedResultsController, you typically specify a cache name. (If you do not specify a cache name, the controller does not cache data.) When you create a controller, it looks for an existing cache with the given name:
How does the controller notify the delegate when the result changes?
The controller notifies the delegate when result objects change location or when sections are modified (see NSFetchedResultsControllerDelegate ). You typically use these methods to update the display of the table view.
How do I split results into sections in a controller?
Optionally, a key path on result objects that returns the section name. The controller uses the key path to split the results into sections (passing nil indicates that the controller should generate a single section). Optionally, the name of the cache file the controller should use (passing nil prevents caching).