在同一UITableView的不同部分中显示多个NSFetchedResultsControllers
早上好。 在我的应用程序中，我有不同的实体，我想在同一个TableView中显示它。 我知道要做到这一点，我需要不同的NSFetchedResultsController。 当我添加一个对象时，第一部分没有问题，但是当我向第二部分添加一个对象时，就会出现问题。 这是我正在使用的代码
import UIKit import CoreData class MainMenu: UITableViewController, NSFetchedResultsControllerDelegate { /**********/ /** Vars **/ /**********/ lazy var frcAccount: NSFetchedResultsController = self.AccountFetchedResultController() lazy var frcCar: NSFetchedResultsController = self.CarFetchedResultsController() let idxAccNew = NSIndexPath(forRow: 0, inSection: 0) let idxCarNew = NSIndexPath(forRow: 0, inSection: 1) let idxConfig = NSIndexPath(forRow: 0, inSection: 2) /**************/ /** IBOutlet **/ /**************/ /***************/ /** IBActions **/ /***************/ /***************/ /** Functions **/ /***************/ // MARK:- NSFetchedResultsController func AccountFetchedResultController() -> NSFetchedResultsController { let fetchRequest = NSFetchRequest(entityName: Account.entityName) fetchRequest.fetchBatchSize = 10 let sortDescriptor = NSSortDescriptor(key: "id", ascending: false) fetchRequest.sortDescriptors = [sortDescriptor] frcAccount = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: coreDataStack.context, sectionNameKeyPath: nil, cacheName: nil) frcAccount.delegate = self do { try frcAccount.performFetch() } catch { print("Erro: \(error)") abort() } return frcAccount } func CarFetchedResultsController() -> NSFetchedResultsController { let fetchRequest = NSFetchRequest(entityName: "Car") fetchRequest.fetchBatchSize = 10 let sortDescriptor = NSSortDescriptor(key: "plate", ascending: false) fetchRequest.sortDescriptors = [sortDescriptor] frcCar = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: coreDataStack.context, sectionNameKeyPath: nil, cacheName: nil) frcCar.delegate = self do { try frcCar.performFetch() } catch { print("Error: \(error)") abort() } return frcCar } //MARK:- TableViewDataSource override func numberOfSectionsInTableView(tableView: UITableView) -> Int { return 3 } override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { switch section{ case 0: return frcAccount.sections![0].numberOfObjects + 1 case 1: return frcCar.sections![0].numberOfObjects + 1 default: return 1 } } override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { if indexPath.section == 0 { if indexPath.row == 0 { let cell = tableView.dequeueReusableCellWithIdentifier("Cell") //as UITableViewCell cell!.textLabel?.text = "Nova Conta" return cell! } else { let cell = tableView.dequeueReusableCellWithIdentifier("CellAccount") as! VC_AccountListTableViewCell let idx = NSIndexPath(forRow: indexPath.row - 1, inSection: 0) let object = frcAccount.objectAtIndexPath(idx) as! Account cell.useAccountInfo(object) return cell } } else if indexPath.section == 1{ if indexPath.row == 0 { let cell = tableView.dequeueReusableCellWithIdentifier("Cell") cell!.textLabel?.text = "Novo Carro" return cell! } else { let cell = tableView.dequeueReusableCellWithIdentifier("CellCar") as! VC_CarListTableViewCell let idx = NSIndexPath(forRow: indexPath.row - 1, inSection: 0) let object = frcCar.objectAtIndexPath(idx) as! Car cell.useCarInfo(object) cell.btnFillUp.tag = indexPath.row - 1 cell.btnService.tag = indexPath.row - 1 return cell } } else { let cell = tableView.dequeueReusableCellWithIdentifier("Cell") cell!.textLabel?.text = "Configurações" return cell! } } // MARK: TableViewDelegate override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat { if indexPath == idxAccNew || indexPath == idxCarNew || indexPath == idxConfig { return 44 } else { if indexPath.section == 0 { return 80 } else if indexPath.section == 1 { return 100 } else { return 0 } } } // MARK:- NSFetchedResultsControllerDelegate func controllerWillChangeContent(controller:NSFetchedResultsController) { tableView.beginUpdates() } func controller(controller: NSFetchedResultsController, didChangeSection sectionInfo: NSFetchedResultsSectionInfo, atIndex sectionIndex: Int, forChangeType type: NSFetchedResultsChangeType) { switch(type) { case .Insert: tableView.insertSections(NSIndexSet(index: sectionIndex), withRowAnimation: .Fade) case .Delete: tableView.deleteSections(NSIndexSet(index: sectionIndex), withRowAnimation: .Fade) default: return } } func controller(controller: NSFetchedResultsController, didChangeObject anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?) { switch (type) { case .Insert: tableView.insertRowsAtIndexPaths([newIndexPath!], withRowAnimation: .Fade) case .Delete: tableView.deleteRowsAtIndexPaths([indexPath!], withRowAnimation: .Fade) case .Move: tableView.deleteRowsAtIndexPaths([indexPath!], withRowAnimation: .Fade) tableView.insertRowsAtIndexPaths([newIndexPath!], withRowAnimation: .Fade) case .Update: tableView.reloadRowsAtIndexPaths([indexPath!], withRowAnimation: .Fade) } } func controllerDidChangeContent(controller: NSFetchedResultsController) { tableView.reloadData() tableView.endUpdates() } func reloadData() { tableView.reloadData() } } 是否有可能做到这一点？？ 我尝试了很多不同的解决方案..
谢谢大家
在tableView数据源方法中，您正确地将tableView的indexPath重新映射到相关的FRC的indexPath ，同时还调整了额外的第一行，例如：
let idx = NSIndexPath(forRow: indexPath.row - 1, inSection: 0)
（请注意，您必须在其他tableView数据源委托方法中使用类似的重新映射，例如，如果您实现didSelectRowAtIndexPath ）。 但是你还需要在FRC委托方法中进行反向映射，例如。
func controller(controller: NSFetchedResultsController, didChangeObject anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?) { var tvIdx = NSIndexPath() var newTvIdx = NSIndexPath() var tvSection = 0 // for the Car FRC, we need to insert/delete rows in table view section 1: if (controller == self.frcCar) { tvSection = 1 } // adjust the indexPaths (indexPath and newIndexPath) // to add the extra row, and use the correct tableView section: if let idx = indexPath { tvIdx = NSIndexPath(forRow: idx.row + 1, inSection: tvSection) } if let newIdx = newIndexPath { newTvIdx = NSIndexPath(forRow: newIdx.row + 1, inSection: tvSection) } switch (type) { case .Insert: tableView.insertRowsAtIndexPaths([newTvIdx], withRowAnimation: .Fade) case .Delete: tableView.deleteRowsAtIndexPaths([tvIdx], withRowAnimation: .Fade) case .Move: tableView.deleteRowsAtIndexPaths([tvIdx], withRowAnimation: .Fade) tableView.insertRowsAtIndexPaths([newTvIdx], withRowAnimation: .Fade) case .Update: tableView.reloadRowsAtIndexPaths([tvIdx], withRowAnimation: .Fade) } }
那么就不需要在controllerDidChangeContent使用reloadData ：
func controllerDidChangeContent(controller: NSFetchedResultsController) { tableView.endUpdates() }