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What is a 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 fault?
In Core Data, faults are placeholders, or “unrealized objects”. They are small objects which refer to other NSManagedObjects, which are fetched into memory only as needed. This faulting mechanism is designed to enhance performance and reduce memory use.
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 does use Core Data mean in Xcode?
Core Data is a framework that you use to manage the model layer objects in your application. It provides generalized and automated solutions to common tasks associated with object life cycle and object graph management, including persistence.
How do I get Data from NSManagedObject?
let results = try context. fetch(data); let resultset = results as! [NSManagedObject];
How does nsfetchedresultscontroller respond to changes in 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.
When to ask nsfetchedresultscontroller for relevant information?
You ask the object to provide relevant information in your implementation of the table view data source methods: 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.
How to use nsfetchedresultscontroller in Swift 5?
AppDelegate).managedObjectContext var fetchedResultController: NSFetchedResultsController = NSFetchedResultsController () You might see the above error message “Use of undeclared type ’NSFetchedResultsContoller”.
How does delegate work in 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.