NSFetchedResultsController的快速部分

我有一个表视图，从一个CoreData实体带有3个字段的数据。 名字：string，姓氏：string和完成：NSNumber（这是一个UISwitch可以打开或closures）。

我想用名字和姓氏来填充表格，但是第一部分是带有开关的名字，第二部分是带有开关的名字。

这里是保存数据的代码：

class ViewController: UIViewController { var context = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext! var newItem: List? = nil @IBOutlet weak var txtFirst: UITextField! @IBOutlet weak var txtLast: UITextField! @IBOutlet weak var switchDone: UISwitch! override func viewDidLoad() { super.viewDidLoad() } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() } @IBAction func cancelTapped(sender: AnyObject) { dismissVC() } @IBAction func saveTapped(sender: AnyObject) { let context = self.context let ent = NSEntityDescription.entityForName("List", inManagedObjectContext: context) let nItem = List(entity: ent!, insertIntoManagedObjectContext: context) nItem.firstName = txtFirst.text nItem.lastName = txtLast.text nItem.done = switchDone.on context.save(nil) dismissVC() } func dismissVC() { navigationController?.popViewControllerAnimated(true) } } 

这里是填充表视图的代码：

 class TableViewController: UITableViewController, NSFetchedResultsControllerDelegate { var context = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext! var frc: NSFetchedResultsController = NSFetchedResultsController() func getFetchedResultsController() -> NSFetchedResultsController { frc = NSFetchedResultsController(fetchRequest: listFetchRequest(), managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil) return frc } func listFetchRequest() -> NSFetchRequest { let fetchRequest = NSFetchRequest(entityName: "List") let sortDescriptor = NSSortDescriptor(key: "firstName", ascending: true) fetchRequest.sortDescriptors = [sortDescriptor] return fetchRequest } override func viewDidLoad() { super.viewDidLoad() frc = getFetchedResultsController() frc.delegate = self frc.performFetch(nil) } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() } func controllerDidChangeContent(controller: NSFetchedResultsController) { tableView.reloadData() } // MARK: - Table view data source override func numberOfSectionsInTableView(tableView: UITableView) -> Int { let numberOfSections = frc.sections?.count return numberOfSections! } override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { let numberOfRowsInSection = frc.sections?[section].numberOfObjects return numberOfRowsInSection! } override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! UITableViewCell let list = frc.objectAtIndexPath(indexPath) as! List cell.textLabel?.text = list.firstName cell.detailTextLabel?.text = list.lastName return cell } } 

我只是无法弄清楚如何根据'done'属性将数据分成两部分。

Answer 1

首先，您需要通过done属性对List对象进行sorting，然后inputfirstName ：

 let doneSortDescriptor = NSSortDescriptor(key: "done", ascending: true) let sortDescriptor = NSSortDescriptor(key: "firstName", ascending: true) fetchRequest.sortDescriptors = [doneSortDescriptor, sortDescriptor] 

然后修改您的Fetched Results Controller以使其使用done属性来定义部分：

 frc = NSFetchedResultsController(fetchRequest: listFetchRequest(), managedObjectContext: context, sectionNameKeyPath: "done", cacheName: nil) 

最后，实现tableView:titleForHeaderInSection为每个部分设置适当的标题。