基本上，我有一个UITableView，它从另一个带有四个文本字段的viewController中提取数据。数据被保存并添加到tableView（仅显示单元格中的两个字段）。选择单元格后，它会回到viewController，并在相应的文本字段中添加数据。这也使用了CoreData和NSFetchResultsController。到目前为止，这一切都运作正常，只是想对最近发生的事情做一点回顾。
问题...... 我试图让tableView在两个部分中显示数据。我希望第一部分（第0部分）显示添加到通过在viewController上添加文本字段创建的列表的数据。但是，tableView将第一行添加为第一个部分（标题正确），然后将第二行（和on）添加为第二部分（第1部分）（带部分标题）。我想将viewController中的所有新项目添加到0部分，当我弄清楚如何跨越第0部分的项目并通过选择行（将来会出现）移动到第1部分时，将第1部分留空。
我也是这个网站的新手，无法弄清楚如何发布我的代码。如果有人需要浏览它，你可能需要引导我添加它。此外，我无法将Objective C转换为Swift，请在回答时牢记这一点。谢谢！！我很难道歉。
（tableView Controller＆＃34; SList＆＃34;）
class ShoppingList: UIViewController, NSFetchedResultsControllerDelegate, UITableViewDataSource, UITableViewDelegate {
let moc = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
var frc : NSFetchedResultsController = NSFetchedResultsController()
func itemFetchRequest() -> NSFetchRequest{
let fetchRequest = NSFetchRequest(entityName: "SList")
let primarySortDescription = NSSortDescriptor(key: "slitem", ascending: true)
let secondarySortDescription = NSSortDescriptor(key: "slcross", ascending: true)
fetchRequest.sortDescriptors = [primarySortDescription, secondarySortDescription]
return fetchRequest
}
func getFetchRequetController() ->NSFetchedResultsController{
frc = NSFetchedResultsController(fetchRequest: itemFetchRequest(), managedObjectContext: moc, sectionNameKeyPath: "slitem", cacheName: nil)
return frc
}
@IBOutlet weak var tableView: UITableView!
@IBAction func AddNew(sender: AnyObject) {
frc = getFetchRequetController()
frc.delegate = self
do {
try frc.performFetch()
} catch _ {
print("Failed to perform inital fetch.")
return
}
self.tableView.reloadData()
}
override func viewDidLoad() {
super.viewDidLoad()
frc = getFetchRequetController()
frc.delegate = self
do {
try frc.performFetch()
} catch _ {
print("Failed to perform inital fetch.")
return
}
self.tableView.reloadData()
//TableView Background Color
self.tableView.backgroundColor = UIColor.clearColor()
tableView.reloadData()
self.navigationItem.leftBarButtonItem = self.editButtonItem()
self.tableView.separatorColor = UIColor.blackColor()
}
override func viewDidDisappear(animated: Bool) {
frc = getFetchRequetController()
frc.delegate = self
do {
try frc.performFetch()
} catch _ {
print("Failed to perform inital fetch.")
return
}
self.tableView.reloadData()
}
//TableView Data
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
let managedObject:NSManagedObject = frc.objectAtIndexPath(indexPath) as! NSManagedObject
moc.deleteObject(managedObject)
do {
try moc.save()
} catch _ {
print("Failed to save.")
return
}
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
let numberOfSections = frc.sections?.count
return numberOfSections!
}
//table section headers
func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String?{
let sectionHeader = "Items - #\(frc.sections![section].numberOfObjects)"
let sectionHeader1 = "Crossed Off Items - #\(frc.sections![section].numberOfObjects)"
if (section == 0) {
return sectionHeader
}
if (section == 1){
return sectionHeader1
}else{
return nil
}
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
let numberOfRowsInSection = frc.sections?[section].numberOfObjects
return numberOfRowsInSection!
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)
let items = frc.objectAtIndexPath(indexPath) as! SList
cell.backgroundColor = UIColor.clearColor()
cell.textLabel?.text = "\(items.slitem!) - Qty: \(items.slqty!)"
cell.textLabel?.font = UIFont.systemFontOfSize(23)
return cell
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func controllerDidChangeContent(controller: NSFetchedResultsController) {
tableView.reloadData()
}
//segue to add/edit
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if segue.identifier == "edit" {
let cell = sender as! UITableViewCell
let indexPath = tableView.indexPathForCell(cell)
let SListController:SLEdit = segue.destinationViewController as! SLEdit
let items:SList = frc.objectAtIndexPath(indexPath!) as! SList
SListController.item = items
}
}
}
（ViewController＆＃34; SLEdit＆＃34;）
class SLEdit: UIViewController {
let moc = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
@IBOutlet weak var slitem: UITextField!
@IBOutlet weak var sldesc: UITextField!
@IBOutlet weak var slqty: UITextField!
@IBOutlet weak var slprice: UITextField!
var item: SList? = nil
override func viewDidLoad() {
super.viewDidLoad()
if item != nil{
slitem.text = item?.slitem
sldesc.text = item?.sldesc
slqty.text = item?.slqty
slprice.text = item?.slprice
}
// "x" Delete Feature
self.slitem.clearButtonMode = UITextFieldViewMode.WhileEditing
self.sldesc.clearButtonMode = UITextFieldViewMode.WhileEditing
self.slqty.clearButtonMode = UITextFieldViewMode.WhileEditing
self.slprice.clearButtonMode = UITextFieldViewMode.WhileEditing
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func dismissVC() {
navigationController?.popViewControllerAnimated(true)
}
@IBAction func saveButton(sender: AnyObject) {
if item != nil {
edititems()
} else {
createitems()
}
dismissVC()
}
func createitems() {
let entityDescription = NSEntityDescription.entityForName("SList", inManagedObjectContext: moc)
let item = SList(entity: entityDescription!, insertIntoManagedObjectContext: moc)
item.slitem = slitem.text
item.sldesc = sldesc.text
item.slqty = slqty.text
item.slprice = slprice.text
if slitem.text == nil{
createitems()
}else{
edititems()
}
do {
try moc.save()
} catch _ {
return
}
}
func edititems() {
item?.slitem = slitem.text!
item?.sldesc = sldesc.text!
item?.slqty = slqty.text!
item?.slprice = slprice.text!
do {
try moc.save()
} catch {
return
}
}
}
答案 0 :(得分：0)
我认为问题在于你的FRC配置：
frc = NSFetchedResultsController(fetchRequest: itemFetchRequest(), managedObjectContext: moc, sectionNameKeyPath: "slitem", cacheName: nil)
由于sectionNameKeyPath为slitem，因此FRC会为slitem的每个不同值创建一个新部分。
如果slcross属性用于表示该项目已从列表中删除，请将其指定为sectionNameKeyPath：
frc = NSFetchedResultsController(fetchRequest: itemFetchRequest(), managedObjectContext: moc, sectionNameKeyPath: "slcross", cacheName: nil)
您还需要修改获取请求的排序（必须对其进行排序，以便给定部分中的所有项目都在一起）：
let primarySortDescription = NSSortDescriptor(key: "slcross", ascending: true)
let secondarySortDescription = NSSortDescriptor(key: "slitem", ascending: true)
fetchRequest.sortDescriptors = [primarySortDescription, secondarySortDescription]