Question

我在IOS swift Xcode 8中面临一个问题

在我设置我的核心数据之后，在我插入任何垃圾数据以测试获取功能之前，应用程序运行正常，没有崩溃，没有数据，但在我插入数据后应用程序崩溃，并显示以下消息

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/itemName"
        tools:text="Item Name"
        android:layout_width="0dp"
        android:layout_weight="3"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/itemQuantity"
        tools:text="Quantity"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content" />

</LinearLayout>

这是我的代码

Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UITableViewCell 0x7f9b26054c00> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key Deatials.

此时系统将在没有任何崩溃的情况下运行但是在我在下面添加插入功能后，它开始崩溃

//

import UIKit
import CoreData

       // the NSFetchedResultsControllerDelegate needed to start woring    in all the function for datacore

     class MainVC: UIViewController , UITableViewDelegate,   UITableViewDataSource,NSFetchedResultsControllerDelegate{

// definning the main view the table and the segment.

@IBOutlet weak var TableView: UITableView!
@IBOutlet weak var segment: UISegmentedControl!

// need to difine the NSFetchedResultsController to define the remaining 3 functions for the tableview
var controller : NSFetchedResultsController<Item>!

override func viewDidLoad() {
    super.viewDidLoad()

    generateTeseData()
    attemptFetch()

    TableView.dataSource = self
    TableView.delegate = self
}


// we need to define 3 main fucntions for the table view

func numberOfSections(in tableView: UITableView) -> Int {

    if let sections = controller.sections{
        return sections.count
    }
    return 0
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    // need to difine number of rows in section by NSFetchedResultsController
    if let sections = controller.sections{
        let sectionInfo = sections[section]
        return sectionInfo.numberOfObjects
    }
    return 0
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    // linking the cell var with the class of itemCell been created in the View Folder
    let cell = tableView.dequeueReusableCell(withIdentifier: "CellItem", for: indexPath) as! ItemCell

    // function been created below:
    configureCell(cell: cell, indexPath: indexPath as NSIndexPath)
    return cell
}


func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return 150
}

func configureCell (cell:ItemCell, indexPath: NSIndexPath){
    let item = controller.object(at: indexPath as IndexPath)
    cell.ConfigureCellsInCellclass(item: item)

}


func attemptFetch () {
    let fetchrequest:NSFetchRequest<Item> = Item.fetchRequest()
    let datesort = NSSortDescriptor(key: "created", ascending: false)
    fetchrequest.sortDescriptors = [datesort]

    let controller = NSFetchedResultsController(fetchRequest: fetchrequest, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil)

    self.controller = controller

    do{
       try controller.performFetch()

    }catch{
        let error = error as NSError
        print("\(error)")
    }

}

// these two function for the update in the tableview
func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
    TableView.beginUpdates()
}
func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
    TableView.endUpdates()
}

//this function to preforme all the functions for the <Data Core>
func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {

    switch(type)
    {
    case.insert:
        if let indexpath = newIndexPath {
            TableView.insertRows(at: [indexpath], with: .fade)
        }
        break

    case.delete:
        if let indexpath = indexPath{
            TableView.deleteRows(at: [indexpath], with: .fade)
        }
        break

    case.update:
        if let indexpath = indexPath {
            let cell = TableView.cellForRow(at: indexpath) as! ItemCell
            configureCell(cell: cell, indexPath: indexPath! as NSIndexPath)
        }
        break
    case.move:
        if let indexpath = indexPath {
            TableView.deleteRows(at: [indexpath], with: .fade)

        }
        if let indexpath = indexPath {
            TableView.insertRows(at: [indexpath], with: .fade)
        }
        break
}
}

这是我的查看单元格文件

func generateTeseData(){
    let item = Item(context: context)

    item.title = "IMAC"
    item.price = 2000
    item.details = "Soon"
}

提前谢谢你们

Answer 1

正如@Larme所说，你的问题与IBOutlet有关，而这个问题不再在课堂上反映出来了。

断开坏插座

崩溃的核心数据xcode 8

1 个答案: