如果这令人困惑,我提前道歉。我是 Swift 的新手,没有任何经验和学习经验。
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,它会返回到 viewController 并将数据添加到适当的文本字段中。这也使用了 CoreData 和 NSFetchResultsController。到目前为止,所有这些都正常工作,只是想提供一些背景知识。
问题... 我试图让 tableView 分两部分显示数据。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中的数据。但是,tableView 将第一行添加为第一部分(标题正确),然后将第二行(及之后)添加为第二部分(第 1 节)(带有部分标题)。我想将 viewController 中的所有新项目添加到第 0 部分,将第 1 部分留空,以便当我弄清楚如何从第 0 部分中划掉项目并通过选择行(将来会出现)移动到第 1 部分时。
我也是这个网站的新手,不知道如何发布我的代码。如果有人需要查看它,您可能需要指导我添加它。另外,我在将 Objective C 转换为 Swift 时遇到了麻烦,请在回答时记住这一点。谢谢!!我为困难而道歉。
(表格 View Controller “SList”)
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
}
}
}
( View Controller “SLEdit”)
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
}
}
}
最佳答案
我认为问题出在您的 FRC 配置上:
frc = NSFetchedResultsController(fetchRequest: itemFetchRequest(), managedObjectContext: moc, sectionNameKeyPath: "slitem", cacheName: nil)
因为 sectionNameKeyPath
是 slitem
,FRC 为 slitem
的每个不同值创建一个新部分。
如果 slcross
属性用于指示该项目已从列表中划掉,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]
关于ios - Swift 中的多部分 TableView 出现问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34173761/