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Don't parent background managed object contexts to view context 

Otherwise, certain operations require the background contexts to
interact with the view context, which can block the main thread from
accessing the view context (potentially causing hitches if the view
context access is in a critical path, like cell fetching).
This commit is contained in:
Shadowfacts 2022-09-11 23:00:51 -04:00
parent 66c17006d1
commit 8b78a5e7ad
1 changed files with 6 additions and 2 deletions
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8
Tusker/CoreData/MastodonCachePersistentStore.swift
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@ -20,13 +20,15 @@ class MastodonCachePersistentStore: NSPersistentContainer {
private(set) lazy var backgroundContext: NSManagedObjectContext = {
let context = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType)
context.parent = self.viewContext
context.persistentStoreCoordinator = self.persistentStoreCoordinator
context.automaticallyMergesChangesFromParent = true
return context
}()
private(set) lazy var prefetchBackgroundContext: NSManagedObjectContext = {
let context = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType)
context.parent = self.viewContext
context.persistentStoreCoordinator = self.persistentStoreCoordinator
context.automaticallyMergesChangesFromParent = true
return context
}()
@ -51,6 +53,8 @@ class MastodonCachePersistentStore: NSPersistentContainer {
}
}
viewContext.automaticallyMergesChangesFromParent = true
NotificationCenter.default.addObserver(self, selector: #selector(managedObjectsDidChange), name: .NSManagedObjectContextObjectsDidChange, object: viewContext)
}