【发布时间】：2015-12-14 01:51:08
【问题描述】：
我试图在我的 tableView 中有两个部分。我希望将项目添加到第 0 节，然后能够选择一行以将其从第 0 节移动到第 1 节。到目前为止，我已将项目添加到第 0 节，但是当它关闭时数据不会加载第二个视图控制器。我必须更改视图（点击添加按钮和后退按钮），它最终显示出来（仍然没有弄清楚）。我知道跨部分移动行必须通过数组和 didSelectRow 方法完成，但它让我陷入循环（尤其是使用 coreData）。我是否为第 1 节项目创建第二个数组？ TableView 数据从第二个 ViewController 输入并由实体“SList”的 NSFetchedResultsController 管理。我在“SList”下为“slcross”创建了一个属性（还包括输入“slitem”、“sldesc”、“slqty”和“slprice”，但不知道如何从第 0 部分获取到部分1. 或者，我是否需要为划掉的项目创建第二个实体？抱歉，我有点过头了......
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: "slcross", ascending: true)
let secondarySortDescription = NSSortDescriptor(key: "slitem", ascending: true)
fetchRequest.sortDescriptors = [primarySortDescription, secondarySortDescription]
return fetchRequest
}
func getFetchRequetController() ->NSFetchedResultsController{
frc = NSFetchedResultsController(fetchRequest: itemFetchRequest(), managedObjectContext: moc, sectionNameKeyPath: "slcross", 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()
self.tableView.separatorColor = UIColor.blackColor()
tableView.reloadData()
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!
}
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
}
//end tablevViewData*/
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
}
}
}
第二个视图控制器
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)
}
// Dispose of any resources that can be recreated.
@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
}
}
}
我只是在自学和自学，所以如果你能告诉我并解释它以便我能理解，我将不胜感激！
【问题讨论】：
标签： ios uitableview core-data