Iphone NSFetchedResultsController对象索引路径崩溃(EXC\u错误访问)
我对NSFetchedResultsCOntroller有一个很大的问题。我使用的是FetchedResultsContrrioller,我有3个选项卡的界面。他们也使用核心数据。但我只有一个问题Iphone NSFetchedResultsController对象索引路径崩溃(EXC\u错误访问),iphone,objective-c,core-data,nsfetchedresultscontroller,Iphone,Objective C,Core Data,Nsfetchedresultscontroller,我对NSFetchedResultsCOntroller有一个很大的问题。我使用的是FetchedResultsContrrioller,我有3个选项卡的界面。他们也使用核心数据。但我只有一个问题 Faktura *faktura = [self.fetchedResultsController objectAtIndexPath:indexPath]; cell.textLabel.text = faktura.NumerFV; // THE CRASH IS HERE int produ
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
是我的NSManagedObject子类
僵尸说:
-[CFDictionary retain]:发送到解除分配实例0x5d619d0的消息
我的fetchedResultsController实现:
- (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
MyFaktura
对象插入代码
- (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
是我的UIViewController,用户在其中创建发票。值数组包含值字典:我的发票编号(NSString
)、各种日期(NSDate
)、客户端(NSDictionary
)和产品(NSArray
)
请帮帮我!
如果你需要一些额外的代码,我会把它放在这里
编辑:它肯定是对象索引路径:错误。当我注释所有单元格设置代码(它将显示空单元格),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…:(将值转换器包含到类中以及使用
+初始化
是非标准的。虽然+初始化
应该可以工作,但在核心数据文档中建议不要使用任何类型的初始化方法,而是依赖awakeFromFetch
进行初始化
我会检查您的tableview方法,例如:numberOfRowsInSection:以确保您从tableview获取正确的索引。如果tableview中的行和
获取的对象的计数不同步,您可能会遇到这种崩溃。我想我看到了问题。在您的NSArrayToDataT中变压器
,您有:
- (id)reverseTransformedValue:(id)value {
NSArray *array = [NSKeyedUnarchiver unarchiveObjectWithData:value];
return [array autorelease];
}
由于unarchiveObjectWithData:
不以“alloc”、“new”、“copy”或“mutableCopy”开头,您不拥有该对象,因此可能无法自动释放它。您的NSDictionaryToDataTransformer
中也存在同样的问题。是否可以发布fetchedResultsController
的实现?是否使用@属性(非原子,保留)NSFetchedResultsController*fetchedResultsController;
在你的头文件中?还是assign
?那么那部分看起来很好…下一个嫌疑犯可能是你的Faktura
类。你介意把它的.h和.m文件贴出来吗?贴出来。我用它来转换可转换的值。我认为这不是Faktura
错误。当我使用NSManagedObject*faktura=[self.fetchedResultsController对象索引路径:indexPath];
而不是faktura*faktura=[self.fetchedResultsController对象索引路径:indexPath];
,结果是相同的,但有一个问题,因为fetchedResultsController返回实际行数。NSManagedObject使我的应用程序崩溃。我将检查awakeFromFetch方法并写入结果。不……相同的结果。我将发布Faktura对象插入代码。可能有问题。是的!!!我忘记了无法发布的事实我没有的东西。现在它工作了!谢谢,谢谢谢谢!:)我会在19小时后给你+50:/
- (id)reverseTransformedValue:(id)value {
NSArray *array = [NSKeyedUnarchiver unarchiveObjectWithData:value];
return [array autorelease];
}