mirror of
https://github.com/JohnEstropia/CoreStore.git
synced 2026-04-14 04:59:44 +02:00
(WIP) SwiftUI working demo for LiveList<D>
This commit is contained in:
John Estropia
@@ -23,16 +23,28 @@
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// SOFTWARE.
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//
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#if canImport(Combine)
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#if canImport(UIKit) || canImport(AppKit)
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import Combine
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import CoreData
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#if canImport(UIKit)
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import UIKit
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#elseif canImport(AppKit)
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import AppKit
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#endif
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#if canImport(SwiftUI)
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import SwiftUI
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#endif
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// MARK: - LiveList
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@available(iOS 13.0, *)
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public class LiveList<D: DynamicObject>: Hashable, ObservableObject {
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@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
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public final class LiveList<D: DynamicObject>: Hashable {
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// MARK: Public (Accessors)
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@@ -41,38 +53,272 @@ public class LiveList<D: DynamicObject>: Hashable, ObservableObject {
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*/
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public typealias ObjectType = D
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public var snapshot: Snapshot = []
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// MARK: ObservableObject
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public var objectWillChange: ObservableObjectPublisher {
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return self.cs_toRaw().objectWillChange
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public fileprivate(set) var snapshot: Snapshot = .empty {
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didSet {
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#if canImport(Combine)
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let newValue = self.snapshot
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guard newValue != oldValue else {
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return
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}
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#if canImport(SwiftUI)
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withAnimation {
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self.objectWillChange.send()
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}
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#else
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self.objectWillChange.send()
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#endif
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#endif
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}
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}
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// MARK: Equatable
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public static func == (_ lhs: LiveList<D>, _ rhs: LiveList<D>) -> Bool {
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return lhs === rhs
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}
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// MARK: Hashable
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public func hash(into hasher: inout Hasher) {
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hasher.combine(ObjectIdentifier(self))
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}
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// MARK: Internal
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internal convenience init(dataStack: DataStack, from: From<ObjectType>, sectionBy: SectionBy<ObjectType>?, applyFetchClauses: @escaping (_ fetchRequest: Internals.CoreStoreFetchRequest<NSManagedObject>) -> Void) {
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self.init(
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context: dataStack.mainContext,
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from: from,
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sectionBy: sectionBy,
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applyFetchClauses: applyFetchClauses,
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createAsynchronously: nil
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)
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}
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internal convenience init(dataStack: DataStack, from: From<ObjectType>, sectionBy: SectionBy<ObjectType>?, applyFetchClauses: @escaping (_ fetchRequest: Internals.CoreStoreFetchRequest<NSManagedObject>) -> Void, createAsynchronously: @escaping (LiveList<ObjectType>) -> Void) {
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self.init(
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context: dataStack.mainContext,
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from: from,
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sectionBy: sectionBy,
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applyFetchClauses: applyFetchClauses,
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createAsynchronously: createAsynchronously
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)
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}
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internal convenience init(unsafeTransaction: UnsafeDataTransaction, from: From<ObjectType>, sectionBy: SectionBy<ObjectType>?, applyFetchClauses: @escaping (_ fetchRequest: Internals.CoreStoreFetchRequest<NSManagedObject>) -> Void) {
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self.init(
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context: unsafeTransaction.context,
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from: from,
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sectionBy: sectionBy,
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applyFetchClauses: applyFetchClauses,
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createAsynchronously: nil
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)
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}
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internal convenience init(unsafeTransaction: UnsafeDataTransaction, from: From<ObjectType>, sectionBy: SectionBy<ObjectType>?, applyFetchClauses: @escaping (_ fetchRequest: Internals.CoreStoreFetchRequest<NSManagedObject>) -> Void, createAsynchronously: @escaping (LiveList<ObjectType>) -> Void) {
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self.init(
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context: unsafeTransaction.context,
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from: from,
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sectionBy: sectionBy,
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applyFetchClauses: applyFetchClauses,
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createAsynchronously: createAsynchronously
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)
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}
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// MARK: FilePrivate
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fileprivate let rawObjectWillChange: Any?
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// MARK: Private
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private let observer: Internals.FetchedResultsControllerDelegate
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private var fetchedResultsController: Internals.CoreStoreFetchedResultsController
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private var fetchedResultsControllerDelegate: Internals.FetchedDiffableDataSourceSnapshotDelegate
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private var applyFetchClauses: (_ fetchRequest: Internals.CoreStoreFetchRequest<NSManagedObject>) -> Void
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private var observerForWillChangePersistentStore: Internals.NotificationObserver!
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private var observerForDidChangePersistentStore: Internals.NotificationObserver!
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private let from: From<ObjectType>
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private let sectionBy: SectionBy<ObjectType>?
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private static func recreateFetchedResultsController(context: NSManagedObjectContext, from: From<ObjectType>, sectionBy: SectionBy<ObjectType>?, applyFetchClauses: @escaping (_ fetchRequest: Internals.CoreStoreFetchRequest<NSManagedObject>) -> Void) -> (controller: Internals.CoreStoreFetchedResultsController, delegate: Internals.FetchedDiffableDataSourceSnapshotDelegate) {
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let fetchRequest = Internals.CoreStoreFetchRequest<NSManagedObject>()
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fetchRequest.fetchLimit = 0
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fetchRequest.resultType = .managedObjectResultType
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fetchRequest.includesPendingChanges = false
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fetchRequest.shouldRefreshRefetchedObjects = true
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let fetchedResultsController = Internals.CoreStoreFetchedResultsController(
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context: context,
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fetchRequest: fetchRequest,
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from: from,
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sectionBy: sectionBy,
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applyFetchClauses: applyFetchClauses
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)
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let fetchedResultsControllerDelegate = Internals.FetchedDiffableDataSourceSnapshotDelegate()
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fetchedResultsControllerDelegate.fetchedResultsController = fetchedResultsController
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return (fetchedResultsController, fetchedResultsControllerDelegate)
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}
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private init(context: NSManagedObjectContext, from: From<ObjectType>, sectionBy: SectionBy<ObjectType>?, applyFetchClauses: @escaping (_ fetchRequest: Internals.CoreStoreFetchRequest<NSManagedObject>) -> Void, createAsynchronously: ((LiveList<ObjectType>) -> Void)?) {
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self.from = from
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self.sectionBy = sectionBy
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(self.fetchedResultsController, self.fetchedResultsControllerDelegate) = Self.recreateFetchedResultsController(
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context: context,
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from: from,
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sectionBy: sectionBy,
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applyFetchClauses: applyFetchClauses
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)
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#if canImport(Combine)
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self.rawObjectWillChange = ObservableObjectPublisher()
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#else
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self.rawObjectWillChange = nil
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#endif
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// if let sectionIndexTransformer = sectionBy?.sectionIndexTransformer {
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//
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// self.sectionIndexTransformer = sectionIndexTransformer
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// }
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// else {
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//
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// self.sectionIndexTransformer = { $0 }
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// }
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self.applyFetchClauses = applyFetchClauses
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self.fetchedResultsControllerDelegate.handler = self
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guard let coordinator = context.parentStack?.coordinator else {
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return
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}
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self.observerForWillChangePersistentStore = Internals.NotificationObserver(
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notificationName: NSNotification.Name.NSPersistentStoreCoordinatorStoresWillChange,
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object: coordinator,
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queue: OperationQueue.main,
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closure: { [weak self] (note) -> Void in
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guard let `self` = self else {
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return
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}
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// self.isPersistentStoreChanging = true
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//
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// guard let removedStores = (note.userInfo?[NSRemovedPersistentStoresKey] as? [NSPersistentStore]).flatMap(Set.init),
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// !Set(self.fetchedResultsController.typedFetchRequest.safeAffectedStores() ?? []).intersection(removedStores).isEmpty else {
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//
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// return
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// }
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// self.refetch(self.applyFetchClauses)
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}
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)
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self.observerForDidChangePersistentStore = Internals.NotificationObserver(
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notificationName: NSNotification.Name.NSPersistentStoreCoordinatorStoresDidChange,
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object: coordinator,
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queue: OperationQueue.main,
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closure: { [weak self] (note) -> Void in
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guard let `self` = self else {
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return
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}
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// if !self.isPendingRefetch {
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//
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// let previousStores = Set(self.fetchedResultsController.typedFetchRequest.safeAffectedStores() ?? [])
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// let currentStores = previousStores
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// .subtracting(note.userInfo?[NSRemovedPersistentStoresKey] as? [NSPersistentStore] ?? [])
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// .union(note.userInfo?[NSAddedPersistentStoresKey] as? [NSPersistentStore] ?? [])
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//
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// if previousStores != currentStores {
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//
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// self.refetch(self.applyFetchClauses)
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// }
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// }
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//
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// self.isPersistentStoreChanging = false
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}
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)
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if let createAsynchronously = createAsynchronously {
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// transactionQueue.async {
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//
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// try! self.fetchedResultsController.performFetchFromSpecifiedStores()
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// self.taskGroup.notify(queue: .main) {
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//
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// createAsynchronously(self)
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// }
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// }
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}
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else {
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try! self.fetchedResultsController.performFetchFromSpecifiedStores()
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}
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}
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// MARK: - Snapshot
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public struct Snapshot: RandomAccessCollection {
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public struct Snapshot: RandomAccessCollection, Hashable {
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public subscript(indices: IndexSet) -> [ObjectType] {
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let context = self.context!
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let objectIDs = self.snapshotStruct.itemIdentifiers
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return indices.map { position in
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let objectID = objectIDs[position]
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return context.fetchExisting(objectID)!
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}
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}
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// MARK: RandomAccessCollection
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public var startIndex: Index {
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return 0
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}
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public var endIndex: Index {
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return self.snapshotStruct.numberOfItems
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}
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public subscript(position: Index) -> ObjectType {
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let context = self.context!
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let objectID = self.snapshotStruct.itemIdentifiers[position]
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return context.fetchExisting(objectID)!
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}
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@@ -95,36 +341,85 @@ public class LiveList<D: DynamicObject>: Hashable, ObservableObject {
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// /// supplying `IndexingIterator` as its associated `Iterator`
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// /// type.
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// public typealias Iterator = IndexingIterator<FetchedResults<Result>>
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private let diffableSource: NSDiffable
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}
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}
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extension ListMonitor: ObservableObject {
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public var objectWillChange: ObservableObjectPublisher {
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// MARK: Equatable
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public static func == (_ lhs: Snapshot, _ rhs: Snapshot) -> Bool {
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return lhs.snapshotReference == rhs.snapshotReference
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}
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// MARK: Hashable
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public func hash(into hasher: inout Hasher) {
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hasher.combine(self.snapshotReference)
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}
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// MARK: Internal
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internal static var empty: Snapshot {
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return .init()
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}
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internal init(snapshotReference: NSDiffableDataSourceSnapshotReference, context: NSManagedObjectContext) {
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self.snapshotReference = snapshotReference
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self.snapshotStruct = snapshotReference as NSDiffableDataSourceSnapshot<NSString, NSManagedObjectID>
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self.context = context
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}
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// MARK: Private
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return withUnsafePointer(to: &Static.objectWillChange) {
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self.userInfo[
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$0,
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lazyInit: ObservableObjectPublisher.init
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] as! ObservableObjectPublisher
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private let snapshotReference: NSDiffableDataSourceSnapshotReference
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private let snapshotStruct: NSDiffableDataSourceSnapshot<NSString, NSManagedObjectID>
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private let context: NSManagedObjectContext?
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private init() {
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self.snapshotReference = .init()
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self.snapshotStruct = self.snapshotReference as NSDiffableDataSourceSnapshot<NSString, NSManagedObjectID>
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self.context = nil
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}
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}
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}
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@available(iOS 13.0, *)
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extension CoreStoreObject: ObservableObject {
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public var objectWillChange: ObservableObjectPublisher {
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return self.cs_toRaw().objectWillChange
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// MARK: - LiveList: FetchedDiffableDataSourceSnapshotHandler
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@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
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extension LiveList: FetchedDiffableDataSourceSnapshotHandler {
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// MARK: FetchedDiffableDataSourceSnapshotHandler
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internal func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChangContentWith snapshot: NSDiffableDataSourceSnapshotReference) {
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self.snapshot = .init(snapshotReference: snapshot, context: controller.managedObjectContext)
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}
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}
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fileprivate enum Static {
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static var objectWillChange: Void?
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#if canImport(Combine)
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import Combine
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// MARK: - LiveList: ObservableObject
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@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
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extension LiveList: ObservableObject {
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// MARK: ObservableObject
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public var objectWillChange: ObservableObjectPublisher {
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return self.rawObjectWillChange! as! ObservableObjectPublisher
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}
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}
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#endif
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#endif
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