我一直在开发一个应用程序，遇到了一些问题，所以我尽可能简单地重新构建它以找出错误发生的位置。我的代码使用 CoreData，我的第一个示例包含在导航栏的加号按钮内添加新项目的代码。换句话说，没有 View 或 segue 的改变。这个版本像我期望的那样工作。请参阅以下 GIF。
但是当我创建一个添加新项目的新 View Controller 时，我最终得到的是一个空白单元格。我在加号按钮后面有完全相同的代码。我只是使用 show segue 从 tableview 到普通 View Controller 。但是，如果我退出该应用程序并重新启动它，一切都会正确显示。见下文。
如果你很好奇，我有它添加到 1 到 3 之间的随机数的部分。我猜我需要对那个 segue 做些什么，但我不知道它是什么。我是 Swift 的新手，所以我有很多东西要学。
提前感谢您能给我的任何帮助。我想如果我能解决这个问题，我终于可以继续开发我的应用程序了。再次感谢你。下面是我的代码，用于它有一个 segue 的情况。
TableView Controller 代码(Swift)
import UIKit
import CoreData
class ListItemsTVC: UITableViewController, NSFetchedResultsControllerDelegate {
// MARK: - Constants and Variables
let moc = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
var frc: NSFetchedResultsController = NSFetchedResultsController()
// MARK: - App loading Functions
override func viewDidLoad() {
super.viewDidLoad()
frc = getFCR()
frc.delegate = self
do {
try frc.performFetch()
} catch {
print("Failed to perform inital fetch")
}
self.tableView.rowHeight = 62
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Outlets and Actions
/*@IBAction func addItem(sender: AnyObject) {
let entityDesc = NSEntityDescription.entityForName("Items", inManagedObjectContext: moc)
let item = Items(entity: entityDesc!, insertIntoManagedObjectContext: moc)
if (NSUserDefaults.standardUserDefaults().objectForKey("nextItemID") == nil) {
NSUserDefaults.standardUserDefaults().setObject(1, forKey: "nextItemID")
NSUserDefaults.standardUserDefaults().synchronize()
}
let id = NSUserDefaults.standardUserDefaults().integerForKey("nextItemID")
item.id = id
switch id {
case 1...9:
item.name = "Item ID: 0\(id)"
default:
item.name = "Item ID: \(id)"
}
item.brand = "Brand \(id)"
item.qty = 1
item.price = 0
item.size = "Size \(id)"
let sec: Int = Int(arc4random_uniform(UInt32(4 - 1))) + 1
item.section = "Section \(sec)"
item.isChecked = false
do {
try moc.save()
NSUserDefaults.standardUserDefaults().setObject(id + 1, forKey: "nextItemID")
NSUserDefaults.standardUserDefaults().synchronize()
} catch {
fatalError("New item save failed")
}
}*/
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
if let sections = frc.sections {
return sections.count
}
return 0
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if let sections = frc.sections {
let currentSection = sections[section]
return currentSection.numberOfObjects
}
return 0
}
override func tableView(tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return 28
}
override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
if let sections = frc.sections {
let currentSection = sections[section]
return currentSection.name
}
return nil
}
func controllerWillChangeContent(controller: NSFetchedResultsController) {
tableView.beginUpdates()
}
func controllerDidChangeContent(controller: NSFetchedResultsController) {
tableView.endUpdates()
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("listContentCell", forIndexPath: indexPath) as! ListItemsTVCell
let item = frc.objectAtIndexPath(indexPath) as! Items
cell.separatorInset = UIEdgeInsets(top: 0, left: 78, bottom: 0, right: 0)
cell.itemName.text = item.name
cell.itemSection.text = item.section
cell.itemQty.text = "Qty: \(item.qty!)"
cell.itemSize.text = item.size
cell.itemPrice.text = floatToCurrency(Float(item.price!))
//cell.itemImage.image = UIImage(data: item.image!)
cell.itemID.text = String(item.id!)
return cell
}
override func tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath) -> [UITableViewRowAction]? {
let delete = UITableViewRowAction(style: .Destructive, title: "Delete") { (action, indexPath) in
let item = self.frc.objectAtIndexPath(indexPath) as! Items
let id = item.id!
let request = self.fetchRequest()
let pred = NSPredicate(format: "%K == %@", "id",id)
request.predicate = pred
var fetchResults = [AnyObject]()
do {
fetchResults = try self.moc.executeFetchRequest(request)
} catch {
fatalError("Fetching Data to Delete Failed")
}
self.moc.deleteObject(fetchResults[0] as! NSManagedObject)
fetchResults.removeAtIndex(0)
do {
try self.moc.save()
} catch {
fatalError("Failed to Save after Delete")
}
}
return [delete]
}
func controller(controller: NSFetchedResultsController, didChangeSection sectionInfo: NSFetchedResultsSectionInfo, atIndex sectionIndex: Int, forChangeType type: NSFetchedResultsChangeType) {
switch type {
case NSFetchedResultsChangeType.Delete:
self.tableView.deleteSections(NSIndexSet(index: sectionIndex), withRowAnimation: UITableViewRowAnimation.Automatic)
case NSFetchedResultsChangeType.Insert:
self.tableView.insertSections(NSIndexSet(index: sectionIndex), withRowAnimation: UITableViewRowAnimation.Automatic)
/*case NSFetchedResultsChangeType.Update:
tableView.reloadSections(NSIndexSet(index: sectionIndex), withRowAnimation: UITableViewRowAnimation.Automatic)*/
default:
print("Default in didChangeSection was called")
break
}
}
internal func controller(controller: NSFetchedResultsController, didChangeObject anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?) {
switch type {
case NSFetchedResultsChangeType.Delete:
self.tableView.deleteRowsAtIndexPaths([indexPath!], withRowAnimation: UITableViewRowAnimation.Automatic)
case NSFetchedResultsChangeType.Insert:
self.tableView.insertRowsAtIndexPaths([newIndexPath!], withRowAnimation: UITableViewRowAnimation.Fade)
default:
print("Default in didChangeObject was called")
break
}
}
/*
// Override to support conditional editing of the table view.
override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
// Return false if you do not want the specified item to be editable.
return true
}
*/
/*
// Override to support editing the table view.
override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == .Delete {
// Delete the row from the data source
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
} else if editingStyle == .Insert {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
*/
/*
// Override to support rearranging the table view.
override func tableView(tableView: UITableView, moveRowAtIndexPath fromIndexPath: NSIndexPath, toIndexPath: NSIndexPath) {
}
*/
/*
// Override to support conditional rearranging of the table view.
override func tableView(tableView: UITableView, canMoveRowAtIndexPath indexPath: NSIndexPath) -> Bool {
// Return false if you do not want the item to be re-orderable.
return true
}
*/
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
// MARK: - Custom Functions
func fetchRequest() -> NSFetchRequest {
let fetchRequest = NSFetchRequest(entityName: "Items")
let sortDesc1 = NSSortDescriptor(key: "section", ascending: true)
let sortDesc2 = NSSortDescriptor(key: "isChecked", ascending: true)
let sortDesc3 = NSSortDescriptor(key: "name", ascending: true)
fetchRequest.sortDescriptors = [sortDesc1, sortDesc2, sortDesc3]
return fetchRequest
}
func getFCR() -> NSFetchedResultsController {
frc = NSFetchedResultsController(fetchRequest: fetchRequest(), managedObjectContext: moc, sectionNameKeyPath: "section" , cacheName: nil)
return frc
}
func floatToCurrency(flt: Float) -> String {
let formatter = NSNumberFormatter()
formatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle
return String(formatter.stringFromNumber(flt)!)
}
}
View Controller (Swift) [The segue view]
import UIKit
import CoreData
class AddItemListVC: UIViewController, NSFetchedResultsControllerDelegate {
// MARK: - Constants and Variables
let moc = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
//var frc: NSFetchedResultsController = NSFetchedResultsController()
// MARK: - App loading Functions
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Outlets and Actions
@IBAction func addItem(sender: AnyObject) {
let entityDesc = NSEntityDescription.entityForName("Items", inManagedObjectContext: moc)
let item = Items(entity: entityDesc!, insertIntoManagedObjectContext: moc)
if (NSUserDefaults.standardUserDefaults().objectForKey("nextItemID") == nil) {
NSUserDefaults.standardUserDefaults().setObject(1, forKey: "nextItemID")
NSUserDefaults.standardUserDefaults().synchronize()
}
let id = NSUserDefaults.standardUserDefaults().integerForKey("nextItemID")
item.id = id
switch id {
case 1...9:
item.name = "Item ID: 0\(id)"
default:
item.name = "Item ID: \(id)"
}
item.brand = "Brand \(id)"
item.qty = 1
item.price = 0
item.size = "Size \(id)"
let sec: Int = Int(arc4random_uniform(UInt32(4 - 1))) + 1
item.section = "Section \(sec)"
item.isChecked = false
do {
try moc.save()
NSUserDefaults.standardUserDefaults().setObject(id + 1, forKey: "nextItemID")
NSUserDefaults.standardUserDefaults().synchronize()
} catch {
fatalError("New item save failed")
}
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
最佳答案
重新加载 TableView 数据是 viewWillAppear 方法:
override func viewWillAppear() {
super.viewWillAppear()
do {
try frc.performFetch()
} catch {
print("Failed to perform inital fetch")
}
}
当您从 viewController 返回时，您并没有告诉 TableViewController 更新 tableView，因此请在 viewWillAppear 中进行更新，因为当您弹出 navController 时它会触发回来。
关于ios - 新表格 View 单元格显示为空白单元格，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36994649/