127 lines
4.2 KiB
Swift
127 lines
4.2 KiB
Swift
//
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// GameCollectionViewDataSource.swift
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// Delta
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//
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// Created by Riley Testut on 10/30/15.
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// Copyright © 2015 Riley Testut. All rights reserved.
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//
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import UIKit
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import CoreData
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class GameCollectionViewDataSource: NSObject
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{
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var supportedGameCollectionIdentifiers: [String]? {
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didSet
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{
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self.updateFetchedResultsController()
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}
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}
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var cellConfigurationHandler: ((GridCollectionViewCell, Game) -> Void)?
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private(set) var fetchedResultsController: NSFetchedResultsController = NSFetchedResultsController()
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private var prototypeCell = GridCollectionViewCell()
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private var _registeredCollectionViewCells = false
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// MARK: - Update -
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func update()
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{
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do
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{
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try self.fetchedResultsController.performFetch()
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}
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catch let error as NSError
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{
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print(error)
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}
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}
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private func updateFetchedResultsController()
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{
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let previousDelegate = self.fetchedResultsController.delegate
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let fetchRequest = Game.fetchRequest()
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var predicates: [Predicate] = []
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if let identifiers = self.supportedGameCollectionIdentifiers
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{
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for identifier in identifiers
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{
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let predicate = Predicate(format: "SUBQUERY(%K, $x, $x.%K == %@).@count > 0", Game.Attributes.gameCollections.rawValue, GameCollection.Attributes.identifier.rawValue, identifier)
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predicates.append(predicate)
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}
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}
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if predicates.count > 0
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{
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fetchRequest.predicate = CompoundPredicate(orPredicateWithSubpredicates: predicates)
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}
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fetchRequest.sortDescriptors = [SortDescriptor(key: Game.Attributes.typeIdentifier.rawValue, ascending: true), SortDescriptor(key: Game.Attributes.name.rawValue, ascending: true)]
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self.fetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: DatabaseManager.sharedManager.managedObjectContext, sectionNameKeyPath: Game.Attributes.typeIdentifier.rawValue, cacheName: nil)
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self.fetchedResultsController.delegate = previousDelegate
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self.update()
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}
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// MARK: - Collection View -
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private func configureCell(_ cell: GridCollectionViewCell, forIndexPath indexPath: IndexPath)
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{
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let game = self.fetchedResultsController.object(at: indexPath) as! Game
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if let handler = self.cellConfigurationHandler
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{
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handler(cell, game)
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}
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}
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}
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extension GameCollectionViewDataSource: UICollectionViewDataSource
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{
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func numberOfSections(in collectionView: UICollectionView) -> Int
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{
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return self.fetchedResultsController.sections?.count ?? 0
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}
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func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
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{
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let count = self.fetchedResultsController.sections?[section].numberOfObjects ?? 0
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return count
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}
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func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
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{
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let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "GameCell", for: indexPath) as! GridCollectionViewCell
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self.configureCell(cell, forIndexPath: indexPath)
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return cell
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}
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}
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extension GameCollectionViewDataSource: UICollectionViewDelegate
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{
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func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: IndexPath) -> CGSize
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{
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let collectionViewLayout = collectionView.collectionViewLayout as! GridCollectionViewLayout
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let widthConstraint = self.prototypeCell.contentView.widthAnchor.constraint(equalToConstant: collectionViewLayout.itemWidth)
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widthConstraint.isActive = true
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self.configureCell(self.prototypeCell, forIndexPath: indexPath)
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let size = self.prototypeCell.contentView.systemLayoutSizeFitting(UILayoutFittingCompressedSize)
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widthConstraint.isActive = false
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return size
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}
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}
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