TableViewControllerここ数日、 Core Data を使用する Swift プロジェクトでフィルタを作成することに取り組んできました。UISearchControllerを使用する必要があること、 を作成する必要があることが最終的にわかりましNSPredicateたsearchController.searchBar。
この投稿は非常に役に立ちましたが、このプロジェクトをモデリングしたTVC後、「すべてのライトが点灯しているが、誰も家にいない」ことがわかりました。検索、述語の作成searchBar、追加、削除などはできますが、セルは検索用に更新されません。私は何かが欠けていますが、何がわかりません。
これが私のコードの関連部分です。
class MasterViewController: UITableViewController, NSFetchedResultsControllerDelegate, UISearchControllerDelegate, UISearchResultsUpdating
// Properties that get instantiated later
var detailViewController: DetailViewController? = nil
var addNoteViewController:AddNoteViewController? = nil // I added this
var managedObjectContext: NSManagedObjectContext? = nil
// Added variable for UISearchController
var searchController: UISearchController!
var searchPredicate: NSPredicate? // I added this. It's optional on and gets set later
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.leftBarButtonItem = self.editButtonItem()
if let split = self.splitViewController {
let controllers = split.viewControllers
let context = self.fetchedResultsController.managedObjectContext
let entity = self.fetchedResultsController.fetchRequest.entity!
self.detailViewController = controllers[controllers.count-1].topViewController as? DetailViewController
}
// UISearchController setup
searchController = UISearchController(searchResultsController: nil)
searchController.dimsBackgroundDuringPresentation = false
searchController.searchResultsUpdater = self
searchController.searchBar.sizeToFit()
self.tableView.tableHeaderView = searchController?.searchBar
self.tableView.delegate = self
self.definesPresentationContext = true
}
// MARK: - UISearchResultsUpdating Delegate Method
// Called when the search bar's text or scope has changed or when the search bar becomes first responder.
func updateSearchResultsForSearchController(searchController: UISearchController) {
let searchText = self.searchController?.searchBar.text // steve put breakpoint
println(searchController.searchBar.text)
if let searchText = searchText {
searchPredicate = NSPredicate(format: "noteBody contains[c] %@", searchText)
self.tableView.reloadData()
println(searchPredicate)
}
}
override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == .Delete {
var note: Note
if searchPredicate == nil {
note = self.fetchedResultsController.objectAtIndexPath(indexPath) as! Note
} else {
let filteredObjects = self.fetchedResultsController.fetchedObjects?.filter() {
return self.searchPredicate!.evaluateWithObject($0)
}
note = filteredObjects![indexPath.row] as! Note
}
let context = self.fetchedResultsController.managedObjectContext
context.deleteObject(note)
var error: NSError? = nil
if !context.save(&error) {
abort()
}
}
}
// MARK: - Fetched results controller
var fetchedResultsController: NSFetchedResultsController {
if _fetchedResultsController != nil {
return _fetchedResultsController!
}
let fetchRequest = NSFetchRequest()
// Edit the entity name as appropriate.
let entity = NSEntityDescription.entityForName("Note", inManagedObjectContext: self.managedObjectContext!)
fetchRequest.entity = entity
// Set the batch size to a suitable number.
fetchRequest.fetchBatchSize = 20
// Edit the sort key as appropriate.
let sortDescriptor = NSSortDescriptor(key: "noteTitle", ascending: false)
let sortDescriptors = [sortDescriptor]
fetchRequest.sortDescriptors = [sortDescriptor]
// Edit the section name key path and cache name if appropriate.
// nil for section name key path means "no sections".
let aFetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: self.managedObjectContext!, sectionNameKeyPath: nil, cacheName: "Master")
aFetchedResultsController.delegate = self
_fetchedResultsController = aFetchedResultsController
var error: NSError? = nil
if !_fetchedResultsController!.performFetch(&error) {
// Replace this implementation with code to handle the error appropriately.
// abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
println("Unresolved error \(error), \(error?.userInfo)")
abort()
}
return _fetchedResultsController!
}
var _fetchedResultsController: NSFetchedResultsController? = nil
func controllerWillChangeContent(controller: NSFetchedResultsController) {
// self.tableView.beginUpdates() // ** original code, change if doesn't work** steve put breakpoint here
// ANSWER said this section is redundant, but keeping it b/c it doesn't crash
if searchPredicate == nil {
tableView.beginUpdates()
} else {
(searchController.searchResultsUpdater as! MasterViewController).tableView.beginUpdates()
}
}
func controller(controller: NSFetchedResultsController, didChangeSection sectionInfo: NSFetchedResultsSectionInfo, atIndex sectionIndex: Int, forChangeType type: NSFetchedResultsChangeType) {
var tableView = UITableView()
if searchPredicate == nil {
tableView = self.tableView
} else {
tableView = (searchController.searchResultsUpdater as! MasterViewController).tableView
}
switch type {
case .Insert:
self.tableView.insertSections(NSIndexSet(index: sectionIndex), withRowAnimation: .Fade)
case .Delete:
self.tableView.deleteSections(NSIndexSet(index: sectionIndex), withRowAnimation: .Fade)
default:
return
}
}
私の問題は、このセクションで「生きている」と思います。ここまで Autocomplete は私の友人でしたがsearchIndex、AutoComplete で参照されている " " は見当たりません。何かが欠けていると思いますが、何がどのように欠けているのかわかりません。
ここまで読んでくれてありがとう。これが、私が取り組んでいるブランチの GitHub リポジトリです。
func controller(controller: NSFetchedResultsController, didChangeObject anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?) {
var tableView = UITableView()
if self.searchPredicate == nil {
tableView = self.tableView
} else {
tableView = (self.searchController.searchResultsUpdater as! MasterViewController).tableView
}
switch type {
case .Insert:
println("*** NSFetchedResultsChangeInsert (object)")
tableView.insertRowsAtIndexPaths([newIndexPath!], withRowAnimation: .Fade)
case .Delete:
println("*** NSFetchedResultsChangeDelete (object)")
tableView.deleteRowsAtIndexPaths([indexPath!], withRowAnimation: .Fade)
case .Update:
println("*** NSFetchedResultsChangeUpdate (object)")
// TODO: need fix this
// ORIGINAL CODE
// self.configureCell(tableView.cellForRowAtIndexPath(indexPath!)!, atIndexPath: indexPath!) // original code
// PROSPECTIVE SOLUTION CODE
println("*** NSFetchedResultsChangeUpdate (object)")
if searchPredicate == nil {
self.configureCell(tableView.cellForRowAtIndexPath(indexPath!)!, atIndexPath: indexPath!) // original code
} else {
// Should search the do something w/ the UISearchControllerDelegate or UISearchResultsUpdating
// Instead of "indexPath", it should be "searchIndexPath"--How?
let cell = tableView.cellForRowAtIndexPath(searchIndexPath) as LocationCell // My cell is a vanilla cell, not a xib
let location = controller.objectAtIndexPath(searchIndexPath) as Location // My object is a "Note"
cell.configureForLocation(location) // This is from the other guy's code, don't think it's applicable to me
}
case .Move:
println("*** NSFetchedResultsChangeMove (object)")
tableView.deleteRowsAtIndexPaths([indexPath!], withRowAnimation: .Fade)
tableView.insertRowsAtIndexPaths([newIndexPath!], withRowAnimation: .Fade)
default:
return
}
}
func controllerDidChangeContent(controller: NSFetchedResultsController) {
if self.searchPredicate == nil {
self.tableView.endUpdates()
} else {
println("controllerDidChangeContent")
(self.searchController.searchResultsUpdater as! MasterViewController).tableView.endUpdates()
}
}
編集: @pbasdf ごとに、TableView メソッドを追加しています。
// MARK: - Table View
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return self.fetchedResultsController.sections?.count ?? 0
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if self.searchPredicate == nil {
let sectionInfo = self.fetchedResultsController.sections![section] as! NSFetchedResultsSectionInfo
return sectionInfo.numberOfObjects
}
let sectionInfo = self.fetchedResultsController.sections![section] as! NSFetchedResultsSectionInfo
return sectionInfo.numberOfObjects
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! UITableViewCell
self.configureCell(cell, atIndexPath: indexPath)
return cell
}
override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
// Return false if you do not want the specified item to be editable.
return true
}