NSFetchedResultsController objectAtIndexPath崩溃（EXC_BAD_ACCESS） [英] NSFetchedResultsController objectAtIndexPath crash (EXC_BAD_ACCESS)

问题描述

我对NSFetchedResultsCOntroller有很大的疑问。我正在使用fetchedResultsContrioller，并且具有3个标签的界面。他们也使用核心数据。但是我只有一个问题。

  Faktura * faktura = [self.fetchedResultsController objectAtIndexPath：indexPath]; 
 
 cell.textLabel.text = faktura.NumerFV; //此处产生了崩溃
 
 int productsCount = [faktura.Produkty count]; //或此处
 NSString * kontrahentName = [faktura.Kontrahent valueForKey：@ NazwaKrotka]; // //或在这里
 
 cell.detailTextLabel.text = [NSString stringWithFormat：@ nabywca：％@，产品：％d，kontrahentName，productsCount]; 
 
 cell.imageView.image = [UIImage imageNamed：@ faktura_cell_image.png]; 
 cell.hidesImageWhileEditing = YES; 
 cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; 
  

Faktura 是我的NSManagedObject子类。

NSZombie说：
-[CFDictionary keep]：发送到已释放实例0x5d619d0

我的fetchedResultsController实现：

 -（NSFetchedResultsController *）fetchedResultsController {
 
 if（__fetchedResultsController！= nil）返回__fetchedResultsController; 
 
 //设置表
 
 NSFetchRequest * fetchRequest = [[NSFetchRequest alloc] init]; 
 NSEntityDescription * entity = [NSEntityDescription entityForName：@ Faktura inManagedObjectContext：self.managedObjectContext]; 
 [fetchRequest setEntity：entity]; 
 
 //设置排序描述符
 
 NSSortDescriptor * sortDescriptor = [[[NSSortDescriptor alloc] initWithKey：@ DataWystawienia ascending：YES]; 
 NSArray * sortDescriptors = [[NSArray alloc] initWithObjects：sortDescriptor，nil]; 
 [fetchRequest setSortDescriptors：sortDescriptors]; 
 
 //创建访存结果控制器
 
 NSFetchedResultsController * aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest：fetchRequestmanagedObjectContext：self.managedObjectContext sectionNameKeyPath：nil cacheName：nil]; 
 aFetchedResultsController.delegate =自我; 
 self.fetchedResultsController = aFetchedResultsController; 
 
 [aFetchedResultsController版本]； 
 [fetchRequest版本]; 
 [sortDescriptor版本]； 
 [sortDescriptors版本]； 
 
 NSError *错误=无; 
 if（！[self.fetchedResultsController performFetch：& error]）{//除非我使用NFSetchedResultsController用cacheName：nil初始化，否则会产生崩溃。 （如果它是cacheName：@ Root IT崩溃。）
 
 UIAlertView * alert = [[UIAlertView alloc] initWithTitle：@BłądKrytyczny消息：@Wystąpiłnieznanybłądprzy zmienianiuzawartościci w bazie danych。Dla dobra twoich danych表示歉意niezwłoczniewyjśćz aplikacji ispróbowaćponownie。委托：自我cancelButtonTitle：@确定 otherButtonTitles：无]； 
 [警报显示]； 
 [警报发布]； 
 
 NSLog（@未解决的错误％@，％@，错误，[错误userInfo]）; 
 abort（）; 
} 
 
 return __fetchedResultsController; 
} 
  

Faktura.h

  #import< Foundation / Foundation.h> 
 #import< CoreData / CoreData.h> 
 
 @interface NSArrayToDataTransformer：NSValueTransformer @end 
 @interface NSDictionaryToDataTransformer：NSValueTransformer @end 
 
 @interface Faktura：NSManagedObject 
 
 @property（非原子，保留）NSDate * DataZaplaty； 
 @property（非原子，保留）NSString * NumerFV; 
 @property（非原子，保留）NSDate * DataWystawienia; 
 @property（非原子，保留）NSDate * DataSprzedazy; 
 @property（非原子的，保留的）id产品
 @property（非原子的，保留的）id Kontrahent； 
 
 @end 
  

Faktura.m

  #import Faktura.h 
 
 @implementation Faktura 
 
 @动态DataZaplaty； 
 @动态NumerFV; 
 @dynamic DataWystawienia; 
 @dynamic DataSprzedazy; 
 @动态产品; 
 @dynamic Kontrahent； 
 
 +（void）初始化{
 if（self == [Faktura class]）{
 NSArrayToDataTransformer * arrayTransformer = [[NSArrayToDataTransformer alloc] init]; 
 [NSValueTransformer setValueTransformer：arrayTransformer forName：@ NSArrayToDataTransformer]; 
 NSDictionaryToDataTransformer * dictTransformer = [[NSDictionaryToDataTransformer alloc] init]; 
 [NSValueTransformer setValueTransformer：dictTransformer forName：@ NSDictionaryToDataTransformer]; 
} 
} 
 
 @end 
 
 
 @ implementation NSArrayToDataTransformer 
 
 +（BOOL）allowsReverseTransformation {
返回是； 
} 
 
 +（Class）transformedValueClass {
 return [NSData class]; 
} 
 
 
-（id）transformedValue：（id）value {
 NSData * data = [NSKeyedArchiver archivedDataWithRootObject：value]; 
个返回数据； 
} 
 
 
-（id）reverseTransformedValue：（id）value {
 NSArray * array = [NSKeyedUnarchiver unarchiveObjectWithData：value]; 
 return [数组自动发布]; 
} 
 
 @end 
 
 
 @implementation NSDictionaryToDataTransformer 
 
 +（BOOL）allowsReverseTransformation {
 return YES ; 
} 
 
 +（Class）transformedValueClass {
 return [NSData class]; 
} 
 
 
-（id）transformedValue：（id）value {
 NSData * data = [NSKeyedArchiver archivedDataWithRootObject：value]; 
个返回数据； 
} 
 
 
-（id）reverseTransformedValue：（id）value {
 NSDictionary * dict = [NSKeyedUnarchiver unarchiveObjectWithData：value]; 
 return [dict autorelease]; 
} 
 
 @end 
  

我的 Faktura 对象插入代码

 -（void）fakturaCreator :( FakturaCreator *）form didEndWithValues：（NSDictionary *）values {
 
 NSManagedObjectContext * context = [self.fetchedResultsControllermanagedObjectContext]; 
 NSEntityDescription * entity = [[self.fetchedResultsController fetchRequest]实体]; 
 Faktura * newFaktura = [NSEntityDescription insertNewObjectForEntityForName：[实体名称] inManagedObjectContext：context]; 
 
 [newFaktura setNumerFV：[values valueForKey：@ id]]]; 
 [newFaktura setDataWystawienia：[values valueForKey：@ creationDate]]; 
 [newFaktura setDataSprzedazy：[values valueForKey：@ sellDate]]]; 
 [newFaktura setDataZaplaty：[values valueForKey：@ paymentDate]]]; 
 [newFaktura setKontrahent：[values valueForKey：@ kontrahent]]； 
 [newFaktura setProdukty：[values valueForKey：@ produkty]]； 
 
 NSError *错误=无; 
 if（！[context save：& error]）{
 NSLog（@未解决的错误％@，％@，错误，[错误userInfo]）; 
 abort（）; 
} 
 
 [self.emptySectionView setHidden：YES]; 
} 
  

FakturaCreator 是我的UIViewController，用户可以在其中创建发票。 values数组包含值的字典：我的发票编号（ NSString ），各种日期（ NSDate ），客户（ NSDictionary ）和产品（ NSArray ）。

请帮助我！
如果您需要一些其他代码，我会把它放在这里。

编辑：这是明确的 objectAtIndexPath：错误。当我注释所有单元格设置代码（它将显示为空单元格），然后尝试删除该单元格时，应用程序在包含 objectatIndexPath：的行上崩溃。

编辑＃2：有人吗？请帮帮我...：（

解决方案

我想我看到了问题。在您的 NSArrayToDataTransformer中，您有这个：

 -（id）reverseTransformedValue：（id）value {
 NSArray * array = [NSKeyedUnarchiver unarchiveObjectWithData：value]； 
返回[array autorelease]; 
} 
  

由于 unarchiveObjectWithData：并非以 alloc， new， copy或 mutableCopy开头，因此您不拥有该对象，并且因此可能无法自动发布它。您在 NSDictionaryToDataTransformer 中遇到相同的问题。

I have a huge problem with NSFetchedResultsCOntroller. I'm using fetchedResultsContrioller and I have interface with 3 tabs. They use Core Data too. But I have a problem with only ONE of them.

Faktura *faktura = [self.fetchedResultsController objectAtIndexPath:indexPath];

cell.textLabel.text = faktura.NumerFV; // THE CRASH IS HERE

int productsCount = [faktura.Produkty count]; // OR HERE
NSString *kontrahentName = [faktura.Kontrahent valueForKey:@"NazwaKrotka"]; // OR HERE

cell.detailTextLabel.text = [NSString stringWithFormat:@"nabywca: %@, produktów: %d",kontrahentName, productsCount];

cell.imageView.image = [UIImage imageNamed:@"faktura_cell_image.png"];
cell.hidesImageWhileEditing = YES;
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

Faktura is my NSManagedObject subclass.

NSZombie says: -[CFDictionary retain]: message sent to deallocated instance 0x5d619d0

My fetchedResultsController implementation:

- (NSFetchedResultsController *)fetchedResultsController {

if (__fetchedResultsController != nil) return __fetchedResultsController;

// Setup the table

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Faktura" inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];

// Setup the sort descriptors

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"DataWystawienia" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
[fetchRequest setSortDescriptors:sortDescriptors];

// Create the fetched results controller

NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:nil];
aFetchedResultsController.delegate = self;
self.fetchedResultsController = aFetchedResultsController;

[aFetchedResultsController release];
[fetchRequest release];
[sortDescriptor release];
[sortDescriptors release];

NSError *error = nil;
if (![self.fetchedResultsController performFetch:&error]) { // THE CRASH IS HERE UNLESS I INIT NSFetchedResultsController WITH cacheName:nil. (IF IT'LL BE cacheName:@"Root" IT CRASHES.)

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Błąd Krytyczny" message:@"Wystąpił nieznany błąd przy zmienianiu zawartości w bazie danych. Dla dobra twoich danych prosimy niezwłocznie wyjść z aplikacji i spróbować ponownie." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];
    [alert release];

    NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
    abort();
}

return __fetchedResultsController;
} 

Faktura.h

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>

@interface NSArrayToDataTransformer : NSValueTransformer @end
@interface NSDictionaryToDataTransformer : NSValueTransformer @end

@interface Faktura : NSManagedObject

@property (nonatomic, retain) NSDate * DataZaplaty;
@property (nonatomic, retain) NSString * NumerFV;
@property (nonatomic, retain) NSDate * DataWystawienia;
@property (nonatomic, retain) NSDate * DataSprzedazy;
@property (nonatomic, retain) id Produkty;
@property (nonatomic, retain) id Kontrahent;

@end

Faktura.m

#import "Faktura.h"

@implementation Faktura

@dynamic DataZaplaty;
@dynamic NumerFV;
@dynamic DataWystawienia;
@dynamic DataSprzedazy;
@dynamic Produkty;
@dynamic Kontrahent;

+ (void)initialize {
if (self == [Faktura class] ) {
    NSArrayToDataTransformer *arrayTransformer = [[NSArrayToDataTransformer alloc] init];
    [NSValueTransformer setValueTransformer:arrayTransformer forName:@"NSArrayToDataTransformer"];
    NSDictionaryToDataTransformer *dictTransformer = [[NSDictionaryToDataTransformer alloc] init];
    [NSValueTransformer setValueTransformer:dictTransformer forName:@"NSDictionaryToDataTransformer"];
}
}

@end


@implementation NSArrayToDataTransformer

+ (BOOL)allowsReverseTransformation {
return YES;
}

+ (Class)transformedValueClass {
return [NSData class];
}


- (id)transformedValue:(id)value {
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:value];
return data;
}


- (id)reverseTransformedValue:(id)value {
NSArray *array = [NSKeyedUnarchiver unarchiveObjectWithData:value];
return [array autorelease];
}

@end


@implementation NSDictionaryToDataTransformer

+ (BOOL)allowsReverseTransformation {
return YES;
}

+ (Class)transformedValueClass {
return [NSData class];
}


- (id)transformedValue:(id)value {
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:value];
return data;
}


- (id)reverseTransformedValue:(id)value {
NSDictionary *dict = [NSKeyedUnarchiver unarchiveObjectWithData:value];
return [dict autorelease];
}

@end

My Faktura object insertion code

- (void)fakturaCreator:(FakturaCreator *)form didEndWithValues:(NSDictionary *)values {

    NSManagedObjectContext *context = [self.fetchedResultsController managedObjectContext];
    NSEntityDescription *entity = [[self.fetchedResultsController fetchRequest] entity];
    Faktura *newFaktura = [NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:context];

    [newFaktura setNumerFV:[values valueForKey:@"id"]];
    [newFaktura setDataWystawienia:[values valueForKey:@"creationDate"]];
    [newFaktura setDataSprzedazy:[values valueForKey:@"sellDate"]];
    [newFaktura setDataZaplaty:[values valueForKey:@"paymentDate"]];
    [newFaktura setKontrahent:[values valueForKey:@"kontrahent"]];
    [newFaktura setProdukty:[values valueForKey:@"produkty"]];

    NSError *error = nil;
    if (![context save:&error]) {
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }

    [self.emptySectionView setHidden:YES];
}

FakturaCreator is my UIViewController where user create an invoice. values array contains dictionary of values: my invoice number (NSString), various dates (NSDate), client (NSDictionary) and products (NSArray).

Please help me! If you want some additional code, i'll put it here.

EDIT: It is definetly objectAtIndexPath: fault. When I comment all the cell setup code (it will display empty cell) and then try to remove the cell, app crashes on line which contains objectatIndexPath:.

EDIT #2: Anybody? Please, help me... :(

解决方案

I think I see the problem. In your NSArrayToDataTransformer, you have this:

- (id)reverseTransformedValue:(id)value {
    NSArray *array = [NSKeyedUnarchiver unarchiveObjectWithData:value];
    return [array autorelease];
}

Since unarchiveObjectWithData: does not begin with "alloc", "new", "copy", or "mutableCopy", you do not own the object and therefore may not autorelease it. You have the same problem in your NSDictionaryToDataTransformer.

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