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私はコインコレクションアプリを開発しています。最近、コアデータをアプリに統合し始めました。カスタムCoinCategoryオブジェクトを格納するコアデータデータベースがあり、各CoinCategoryオブジェクトにはCoinオブジェクトの配列があります。この方法では、私のアプリはカテゴリの点ですべてを保存します。コアデータ変更処理時のエラー
私はコアデータを統合すると、私はエラーなしで私の最初のカテゴリを追加し、何の問題もなくそれを削除しますが、私は2番目のコインカテゴリに追加したときに、私は次のエラーを体験することができます
2017-06-26 09:55:37.218 CoinCollection[18889:12839563] -[CoinCollection.CoinCategory compare:]: unrecognized selector sent to instance 0x608000236cc0 2017-06-26 09:55:37.219215-0400 CoinCollection[18889:12839563] [error] error: Serious application error. Exception was caught during Core Data change processing. This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification. -[CoinCollection.CoinCategory compare:]: unrecognized selector sent to instance 0x608000236cc0 with userInfo (null) CoreData: error: Serious application error. Exception was caught during Core Data change processing. This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification. -[CoinCollection.CoinCategory compare:]: unrecognized selector sent to instance 0x608000236cc0 with userInfo (null)
誰でもこの問題を解決する方法を教えてください。どうもありがとうございました！
私は自分のviewcontrollerとコアデータを実行しているアプリケーションデリゲートのために私のコードを添付しています。
AppDelegate.swift
// We customize the app, system-wide
import UIKit
import CoreData
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
// MARK: - Core Data stack
lazy var persistentContainer: NSPersistentContainer = {
let container = NSPersistentContainer(name: "CoinCollection")
container.loadPersistentStores(completionHandler: { (storeDescription,
error) in
if let error = error as NSError? {
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
return container
}()
// MARK: - Core Data Saving support
func saveContext()
{
let context = persistentContainer.viewContext
if context.hasChanges
{
do
{
try context.save()
}
catch
{
// Replace this implementation with code to handle the error appropriately.
// fatalError() causes the application to generate a crash log and terminate.
//You should not use this function in a shipping application, although it may be useful during development.
let nserror = error as NSError
fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
}
}
}
}
次にビューコントローラ用です。このメソッドを呼び出すサブビューコントローラからCoinオブジェクトを取得し、Coinオブジェクトが既存のカテゴリに適合するかどうかを判断することに注意してください。そうでない場合は、新しいコインを追加します。
// Controls the table view controller showing the general coins (one per each category)
import UIKit
import CoreData
class CoinTableViewController: UITableViewController, NSFetchedResultsControllerDelegate {
//this is an array of all the coins in the collection
//each row of this two-dimensional array represents a new category
var coinsByCategory: [CoinCategoryMO] = []
var fetchResultController: NSFetchedResultsController<CoinCategoryMO>!
//other attributes....
////////////////////////////////////////////////////////////////////////
override func viewDidLoad()
{
super.viewDidLoad()
//////////////////////////////////////////////////////////////////////////////////
//we now fetch the data
let fetchRequest : NSFetchRequest<CoinCategoryMO> = CoinCategoryMO.fetchRequest()
if let appDelegate = (UIApplication.shared.delegate as? AppDelegate)
{
let context = appDelegate.persistentContainer.viewContext
let sortDescriptor = NSSortDescriptor(key: "coinCategory", ascending: true)
fetchRequest.sortDescriptors = [sortDescriptor]
fetchResultController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil)
fetchResultController.delegate = self
do
{
try fetchResultController.performFetch()
if let fetchedObjects = fetchResultController.fetchedObjects
{
self.coinsByCategory = fetchedObjects
}
}
catch
{
print(error)
}
}
//configure even more....
}
// MARK: - Table view data soure
func deleteCoinCategory(rowPath: IndexPath)
{
if 0 <= rowPath.row && rowPath.row < self.coinsByCategory.count
{
//we have just tested that the rowPath index is valid
if let appDelegate = (UIApplication.shared.delegate as? AppDelegate)
{
let context = appDelegate.persistentContainer.viewContext
let coinCategoryToDelete = self.fetchResultController.object(at: rowPath)
context.delete(coinCategoryToDelete)
appDelegate.saveContext()
}
}
}
func deleteCoin(c: Coin, indexOfSelectedCategory: IndexPath) -> Bool
{
//we have a coin that we want to delete from this viewcontroller
//and the data contained in it.
//
//the parameter indexOfSelectedCategory refers to the IndexPath of the
//row in the TableView contained in THIS viewcontroller whose category
//of coins we are modifying in this method
//
//Return value: a boolean that indicates whether a single coin has
//been deleted - meaning that the user should return to the parentviewcontroller
if 0 < indexOfSelectedCategory.row && indexOfSelectedCategory.row < self.coinsByCategory.count && self.coinsByCategory[indexOfSelectedCategory.row].coinCategory?.hasCoin(c: c) == true
{
//the index is valid as it refers to a category in the coinsByCategory array
//and the examined category has the coin in question
if self.coinsByCategory[indexOfSelectedCategory.row].coinCategory?.count == 1
{
//the coin "c" that we are going to delete is the only coin in the entire category
self.deleteCoinCategory(rowPath: indexOfSelectedCategory)
return true
}
else
{
//more than one coin in the category
self.coinsByCategory[indexOfSelectedCategory.row].coinCategory?.removeCoin(c: c)
//we save the changes in the database...
if let appDelegate = (UIApplication.shared.delegate as? AppDelegate)
{
appDelegate.saveContext()
}
return false
}
}
return false
}
func addCoin(coinToAdd: Coin)
{
//we check over each category to see if the coin can be added
for category in self.coinsByCategory
{
if category.coinCategory?.coinFitsCategory(aCoin: coinToAdd) == true
{
//we can add the coin to the category
category.coinCategory?.addCoin(newCoin: coinToAdd)
if let appDelegate = (UIApplication.shared.delegate as? AppDelegate)
{
//we save changes to the database
appDelegate.saveContext()
//we are DONE with this function
return
}
}
}
//since the coinToAdd does not fall in the existing categories, we create a new one
if let appDelegate = (UIApplication.shared.delegate as? AppDelegate)
{
let newCategory = CoinCategoryMO(context: appDelegate.persistentContainer.viewContext)
newCategory.coinCategory = CoinCategory(coins: [coinToAdd], categoryType: CoinCategory.CategoryTypes.COUNTRY_VALUE_AND_CURRENCY)
print("Saving data to context ...")
appDelegate.saveContext()
}
}
//delegate methods control the core data database
func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>)
{
tableView.beginUpdates()
}
func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?)
{
switch type
{
case .insert :
if let newIndexPath = newIndexPath
{
tableView.insertRows(at: [newIndexPath], with: .fade)
}
case .delete:
if let indexPath = indexPath
{
tableView.deleteRows(at: [indexPath], with: .fade)
}
case .update:
if let indexPath = indexPath
{
tableView.reloadRows(at: [indexPath], with: .fade)
}
default:
tableView.reloadData()
}
if let fetchedObjects = controller.fetchedObjects
{
self.coinsByCategory = fetchedObjects as! [CoinCategoryMO]
}
}
func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>)
{
tableView.endUpdates()
}
あなたのご意見やご感想をお待ちしております。
EDIT：CoinCategoryクラスの
マイコード：
// This class is supposed to represent a category of coin objects in CoreData
import Foundation
import CoreData
public class CoinCategory: NSObject, NSCoding
{
//These are the various types of categories that a user can create out of their coin collection
enum CategoryTypes : NSString
{
case COUNTRY_VALUE_AND_CURRENCY = //...
case COUNTRY = //...
case YEAR = //...
case CURRENCY = //...
case NO_CATEGORY = //...
}
//this struct is used to encode data in Key-Value pairs per the NSCoding protocol
struct Keys
{
static let Current_Category_Type = "current_category_type"
static let Coins_In_Category = "coins_in_category"
}
//this is the collection of the coins in the category
var coinsInCategory: [Coin] = [] //initially we have no coins in the collection
var currentCategoryType : CategoryTypes.RawValue = ""
public var count : NSNumber
{
get
{
//..number of coins in category
}
}
public var array : [Coin]
{
get
{
//read-only copy of the Coins array..
}
}
public required init?(coder aDecoder: NSCoder)
{
//we decode this object's information
if let categoryTypeObject = aDecoder.decodeObject(forKey: Keys.Current_Category_Type) as? CategoryTypes.RawValue
{
self.currentCategoryType = categoryTypeObject
}
if let coinsInCategoryArrayObject = aDecoder.decodeObject(forKey: Keys.Coins_In_Category) as? [Coin]
{
self.coinsInCategory = coinsInCategoryArrayObject
}
}
public func encode(with aCoder: NSCoder)
{
//we encode this object's information
aCoder.encode(currentCategoryType, forKey: Keys.Current_Category_Type)
aCoder.encode(self.coinsInCategory, forKey: Keys.Coins_In_Category)
}
override init()
{
super.init()
self.currentCategoryType = CategoryTypes.COUNTRY_VALUE_AND_CURRENCY.rawValue
self.coinsInCategory = []
}
convenience init(coins: [Coin], categoryType: CategoryTypes.RawValue)
{
self.init()
self.coinsInCategory = coins
if isACategoryType(categoryType: categoryType) == true
{
self.currentCategoryType = categoryType
}
else
{
self.currentCategoryType = CategoryTypes.NO_CATEGORY.rawValue
}
}
func isACategoryType(categoryType: NSString) -> Bool
{
switch categoryType
{
case CategoryTypes.COUNTRY_VALUE_AND_CURRENCY.rawValue:
return true
case CategoryTypes.COUNTRY.rawValue:
return true
case CategoryTypes.YEAR.rawValue:
return true
case CategoryTypes.CURRENCY.rawValue:
return true
default:
return false
}
}
func addCoin(newCoin: Coin)
{
//we are adding a new Coin object to this category
//if it falls into the category's type
if self.coinFitsCategory(aCoin: newCoin) == true
{
self.coinsInCategory.append(newCoin)
}
}
func coinFitsCategory(aCoin: Coin) -> Bool
{
//this function tests if aCoin fits into the category type
//but that all varies depending on which category the coin is
if self.coinsInCategory.count == 0
{
//this category is currently empty, so any addition goes!
return true
}
//otherwise, this category is not empty... so we are now going to
//examine the situation more critically
let testCoin = self.coinsInCategory[0]
switch self.currentCategoryType
{
case CategoryTypes.COUNTRY_VALUE_AND_CURRENCY.rawValue:
return (testCoin.getCountry().lowercased == aCoin.getCountry().lowercased) && (testCoin.getValue() == aCoin.getValue()) && (testCoin.getDenomination().lowercased == aCoin.getDenomination().lowercased)
case CategoryTypes.COUNTRY.rawValue:
return testCoin.getCountry().lowercased == aCoin.getCountry().lowercased
case CategoryTypes.CURRENCY.rawValue:
return testCoin.getDenomination().lowercased == aCoin.getDenomination().lowercased
case CategoryTypes.YEAR.rawValue:
return testCoin.getYear() == aCoin.getYear()
default:
return false
}
}
func getIndexOfCoinInCollection(coin: Coin) -> Int
{
//we are going to return -1 if the coin does not exist in the collection
//and are going to return the index otherwise if yes
for i in 0..<self.coinsInCategory.count
{
if coinsInCategory[i] == coin
{
return i
}
}
//have not found anything
return -1
}
func removeCoin(at: Int)
{
//we remove the coin at the index if it is in a valid range of the coinInCategory array
if isValidArrayIndex(index: at)
{
self.coinsInCategory.remove(at: at)
}
}
func getCoin(at: Int) -> Coin?
{
//we return nil if there is an issue in accessing the coin
if isValidArrayIndex(index: at)
{
return self.coinsInCategory[at]
}
else
{
return nil
}
}
func assignCoin(at: Int,c: Coin)
{
if isValidArrayIndex(index: at)
{
self.coinsInCategory[at].assign(right: c)
}
}
func deleteAllCoins()
{
//we delete all the coin in this category
self.coinsInCategory.removeAll()
}
func removeCoin(c: Coin)
{
//we delete a coin from the category
for i in 0..<self.coinsInCategory.count
{
if self.coinsInCategory[i] == c
{
//the coin at index "i" is equal to the coin "c" that we want to delete from the category
self.coinsInCategory.remove(at: i)
return
}
}
}
func hasCoin(c: Coin) -> Bool
{
return getIndexOfCoinInCollection(coin: c) != -1
}
func swapValuesWithAnotherCategory(other: CoinCategory)
{
swap(&self.currentCategoryType, &other.currentCategoryType)
swap(&self.coinsInCategory,&other.coinsInCategory)
}
func swapCoins(indexOne: Int, indexTwo: Int)
{
if isValidArrayIndex(index: indexOne) && isValidArrayIndex(index: indexTwo)
{
swap(&self.coinsInCategory[indexOne],&self.coinsInCategory[indexTwo])
}
}
private func isValidArrayIndex(index: Int) -> Bool
{
return (0 <= index && index < coinsInCategory.count)
}
}
そしてコインカテゴリクラス： //これはプロジェクト
import UIKit
import CoreData
enum TimePeriods: String
{
//this enumeration represents the different time periods that a
//coin was minted in, for the sake of this programn
case BCE = "BCE"
case CE = "CE"
}
public class Coin : NSObject, NSCoding
{
//this struct represents all the keys used in encoding and decoding this object
struct Keys
{
static let Country = "country"
static let Mint = "mint"
static let Year = "year"
static let Currency = "currency"
static let Value = "value"
static let Grade = "grade"
static let Comments = "comments"
static let NumInstances = "numberInstances"
static let Description = "description"
static let Obverse = "obverse"
static let Reverse = "reverse"
}
//this represents a coin in the table view
static let GRADING_LOWER_LIMIT: NSNumber = 1
static let GRADING_UPPER_LIMIT: NSNumber = 70
//this represents the default strings returned if a field does not have the needed information
static let DEFAULT_DESCRIPTIVE_NAME: NSString = "(Description?)"
static let DEFAULT_COMMENTS: NSString = "(Comments?)"
static let DEFAULT_DENOMINATION: NSString = "(Denomination?)"
static let DEFAULT_MINT: NSString = "(Mint?)"
static let DEFAULT_COUNTRY: NSString = "(Country?)"
static let DEFAULT_YEAR: NSString = "(Year?)"
static let DEFAULT_GRADE: NSString = "(Grade?)"
static let DEFAULT_VALUE_AND_DENOMINATION: NSString = "(Value?) (Currency?)"
static let OBVERSE_IMAGE_STRING : NSString = "Obverse"
static let REVERSE_IMAGE_STRING : NSString = "Reverse"
static private let BULLET = "➣ " //represents the kind of bullet to be used to build a complete summary of the coin
//declare members with setters and getters
private var country: NSString = "" //what country/empire/etc. used in?
private var mint: NSString = "" //where minted? EX: US Mint, St. Petersburg
private var year: NSNumber? = nil //what year minted? per gregorian calendar
//the year can be negative to represent the BCE period
//positive to represent the CE periods
private var typeCurrency: NSString = "" //what is the unit of value? EX: Cents, dollars, centavos, etc
private var theValue: NSNumber = 0 //how many? EX: how many dollars, cents, centavos, etc.?
//additional information about the coin
private var grade: NSNumber? //on the american grading scale for coins. 1-70
private var comments: NSString = "" //extra comments stored by the user for himself
private var numberOfInstances: NSNumber = 0 //number of coins exactly like this. EX: 1,2,3,4...etc? For each instance, it must be >= 1.
//This describes the type of the coin
//EX: Walking Liberty Quarter, Barber Quarter, Standing Liberty Quarter... etc
private var descriptiveName: NSString = ""
private var obverseImage: UIImage? = nil
private var reverseImage: UIImage? = nil
public var valueAndDenomination: NSString
{
get
{
//need to check four cases
//case 1: we have the right values for value and denomination
//case 2: we do not have a value but do have denomination
//case 3: we have a value but do not have denomination
//case 4: we do not have both
//
//the reason why we consider 0 to be an empty value is because a coin that was worth
//nothing would not have been minted in the first place!!!
if (self.theValue != 0 && self.typeCurrency != "")
{
//have value and denomination
return "\(self.theValue) \(self.typeCurrency)" as NSString //like "20 Cents"
}
else if (self.theValue == 0 && self.typeCurrency != "")
{
//do not have value, but have denomination
return "(Value?) \(self.typeCurrency)" as NSString
}
else if (self.theValue != 0 && self.typeCurrency == "")
{
//we have value, but do not have denomination
return "\(self.theValue) (Currency?)" as NSString
}
else
{
//we do not have both
return Coin.DEFAULT_VALUE_AND_DENOMINATION as NSString
}
}
}
public required init?(coder aDecoder: NSCoder)
{
//we decode this object's information
if let countryObject = aDecoder.decodeObject(forKey: Keys.Country) as? NSString
{
self.country = countryObject
}
if let mintObject = aDecoder.decodeObject(forKey: Keys.Country) as? NSString
{
self.mint = mintObject
}
if let yearObject = aDecoder.decodeObject(forKey: Keys.Year) as? NSNumber
{
self.year = yearObject
}
if let currencyObject = aDecoder.decodeObject(forKey: Keys.Currency) as? NSString
{
self.typeCurrency = currencyObject
}
if let valueObject = aDecoder.decodeObject(forKey: Keys.Value) as? NSNumber
{
self.theValue = valueObject
}
if let gradeObject = aDecoder.decodeObject(forKey: Keys.Grade) as? NSNumber
{
self.grade = gradeObject
}
if let commentObject = aDecoder.decodeObject(forKey: Keys.Comments) as? NSString
{
self.comments = commentObject
}
if let numInstancesObject = aDecoder.decodeObject(forKey: Keys.NumInstances) as? NSNumber
{
self.numberOfInstances = numInstancesObject
}
if let descriptiveNameObject = aDecoder.decodeObject(forKey: Keys.Description) as? NSString
{
self.descriptiveName = descriptiveNameObject
}
if let obverseImageObject = aDecoder.decodeObject(forKey: Keys.Obverse) as? UIImage
{
self.obverseImage = obverseImageObject
}
if let reverseImageObject = aDecoder.decodeObject(forKey: Keys.Reverse) as? UIImage
{
self.reverseImage = reverseImageObject
}
}
override init()
{
//default initializer
super.init()
self.country = ""
self.mint = ""
self.year = nil
self.typeCurrency = ""
self.theValue = 0
self.comments = ""
self.numberOfInstances = 1
self.descriptiveName = ""
self.obverseImage = nil
self.reverseImage = nil
}
init(country: NSString,year: Int?,typeCurrency: NSString, theValue: NSNumber,mint: NSString,grade: Int?,numInstances: NSNumber = 1,description: NSString, comments: NSString)
{
super.init()
self.country = country
self.mint = mint
self.year = year! as NSNumber
self.typeCurrency = typeCurrency
self.theValue = theValue
self.comments = comments
self.numberOfInstances = numInstances
self.descriptiveName = description
self.obverseImage = nil
self.reverseImage = nil
}
init(country: NSString,year: NSNumber?,typeCurrency: NSString, theValue: NSNumber,mint: NSString,grade: NSNumber?,numInstances: NSNumber = 1,description: NSString, comments: NSString,obverseImage: UIImage, reverseImage: UIImage)
{
super.init()
self.country = country
self.mint = mint
self.year = year
self.typeCurrency = typeCurrency
self.theValue = theValue
self.comments = comments
self.numberOfInstances = numInstances
self.descriptiveName = description
}
public func encode(with aCoder: NSCoder)
{
//we encode the coin's information
aCoder.encode(self.country, forKey: Keys.Country)
aCoder.encode(self.mint, forKey: Keys.Mint)
aCoder.encode(self.year, forKey: Keys.Year)
aCoder.encode(self.typeCurrency, forKey: Keys.Currency)
aCoder.encode(self.theValue, forKey: Keys.Value)
aCoder.encode(self.grade, forKey: Keys.Grade)
aCoder.encode(self.comments, forKey: Keys.Comments)
aCoder.encode(self.numberOfInstances, forKey: Keys.NumInstances)
aCoder.encode(self.descriptiveName, forKey: Keys.Description)
aCoder.encode(self.obverseImage, forKey: Keys.Obverse)
aCoder.encode(self.reverseImage, forKey: Keys.Reverse)
}
//setter and getter functions for class members...
func getCompleteSummary() -> NSString
{
//returns a bulleted list that represents the coin
//and it describes every single detail...
}
func getIncompleteSummary() -> String
{
//returns a bulleted list string that represents the coin
//and it describes every single detail...
}
/////////////////////////////////////////////////////////////////////////////////
func ofSameType(rhs: Coin) -> Bool
{
return (self.getCountry().lowercased == rhs.getCountry().lowercased) && (self.getValue() == rhs.getValue()) && (self.getDenomination().lowercased == rhs.getDenomination().lowercased)
}
public static func==(lhs: Coin, rhs: Coin) -> Bool
{
//we compare two coin objects for equality in ALL Categories
return lhs.country.lowercased == rhs.country.lowercased &&
lhs.theValue == rhs.theValue &&
lhs.typeCurrency.lowercased == rhs.typeCurrency.lowercased &&
lhs.mint.lowercased == rhs.mint.lowercased &&
lhs.year == rhs.year &&
lhs.grade == rhs.grade &&
lhs.comments == rhs.comments &&
lhs.numberOfInstances == rhs.numberOfInstances &&
lhs.descriptiveName == rhs.descriptiveName &&
lhs.obverseImage == rhs.obverseImage &&
lhs.reverseImage == rhs.reverseImage
}
func assign(right: Coin)
{
//we implement this instead of overloading the assignment "=" operator
//as it is not possible to overload the "=" operator
//we assign the right-hand-coin's field values
//to the left-hand coin's side
self.country = right.country
self.theValue = right.theValue
self.typeCurrency = right.typeCurrency
self.mint = right.mint
self.year = right.year
self.grade = right.grade
self.comments = right.comments
self.numberOfInstances = right.numberOfInstances
self.descriptiveName = right.descriptiveName
self.obverseImage = right.obverseImage
self.reverseImage = right.reverseImage
}
}
サンプルコードには、コードを削除してコメントを置き換えて、フォーラムの長さを特定の長さの文字に縮小する機能があることに注意してください投稿します。 – PhysNerd