由于 iOS 持久性商店问题和未从 Coredata 加载数据而导致应用程序崩溃

Posted 2023-03-13

【中文标题】由于 iOS 持久性商店问题和未从 Coredata 加载数据而导致应用程序崩溃

【英文标题】：Getting app crash by iOS Persistent store issue and data not loading from Coredata

【发布时间】：2015-04-08 11:44:33

【问题描述】：

我来了

 Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSManagedObject persistentStore]: unrecognized selector sent to instance 0x3bebf50'  

和

从核心数据加载数据时。我已经引用了链接ios Persistent store issue，但它并没有解决我的问题。数据也没有保存到tableview。 早些时候它正在加载，但由于数据量大，我使用了后台核心数据保存。但目前没有从数据库加载数据。我正在使用 NSFetchResultController 来获取数据。

     -(void)updateThreadEntityWithSyncDetails:(NSMutableDictionary *)inDictionary


  dispatch_queue_t backgroundQueue = dispatch_queue_create("backgroundQueueName", NULL);
NSString *loginUser=[[NSUserDefaults standardUserDefaults] valueForKey:@"currentUser"];

    AppDelegate *sharedDelegate = (AppDelegate *)[[UIApplication   sharedApplication] delegate];
    NSManagedObjectContext *context = [sharedDelegate managedObjectContext];

    NSManagedObjectContext *contextforThread = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];

    contextforThread.parentContext = context;

    [contextforThread performBlock:^
    //    AppDelegate *sharedDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    //    NSManagedObjectContext *context = [sharedDelegate managedObjectContext];
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    [fetchRequest setReturnsObjectsAsFaults:NO];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"ThreadInfo"
                                              inManagedObjectContext:context];
    [fetchRequest setEntity:entity];
    NSPredicate *userPredicate = [NSPredicate predicateWithFormat:@"userEmail == %@",loginUser];
    NSPredicate *threadPredicate = [NSPredicate predicateWithFormat:@"threadID == %@",[inDictionary valueForKey:@"thread"]];
    NSPredicate *compoundPredicate = [NSCompoundPredicate andPredicateWithSubpredicates: @[userPredicate, threadPredicate]];
    [fetchRequest setPredicate:compoundPredicate];

    NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:nil];
    for (ThreadInfo *threadInfo in fetchedObjects)
    
        if([[inDictionary allKeys] containsObject:@"userEmail"])
        
            if([inDictionary valueForKey:@"userEmail"]!=[NSNull null])
            
                threadInfo.userEmail=[inDictionary valueForKey:@"userEmail"];
            
        
        if([[inDictionary allKeys] containsObject:@"secret_seed"])
        
            if([inDictionary valueForKey:@"secret_seed"]!=[NSNull null])
            
                threadInfo.threadSecret=[NSString stringWithFormat:@"%@",[inDictionary valueForKey:@"secret_seed"]];
            
        
        if([[inDictionary allKeys] containsObject:@"r_key"])
        
            if([inDictionary valueForKey:@"r_key"]!=[NSNull null])
            
                threadInfo.remoteKey=[inDictionary valueForKey:@"r_key"];
            
        
        if([[inDictionary allKeys] containsObject:@"solicitation"])
        
            if([inDictionary valueForKey:@"solicitation"]!=[NSNull null])
            
                threadInfo.solicitationID=[inDictionary valueForKey:@"solicitation"];
            
        
        if([[inDictionary allKeys] containsObject:@"r_secret"])
        
            if([inDictionary valueForKey:@"r_secret"]!=[NSNull null])
            
                threadInfo.remoteSecret=[inDictionary valueForKey:@"r_secret"];
            
        



    NSError *error;

    if (![contextforThread save:&error]) 
        NSLog(@"Could not insert to userInfo: %@", [error localizedDescription]);
    
            [context performBlock:^

        NSError *error;
        if (![context save:&error]) 
            NSLog(@"Could not insert to userInfo: %@", [error localizedDescription]);
        

    ];


];


//    if (![context save:&error]) 
//        NSLog(@"Could not update to threadInfo: %@", [error localizedDescription]);
//    

Appdelegate

   - (void)saveContext
 
NSError *error = nil;
NSManagedObjectContext *managedObjectContext = self.managedObjectContext;
if (managedObjectContext != nil) 
    if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error]) 
                  NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();

  
 
 

  #pragma mark - Core Data stack


- (NSManagedObjectContext *)managedObjectContext
 


if (_managedObjectContext != nil) 
    return _managedObjectContext;



NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
if (coordinator != nil) 
    //        _managedObjectContext = [[NSManagedObjectContext alloc] init];
    _managedObjectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];

    [_managedObjectContext setPersistentStoreCoordinator:coordinator];

return _managedObjectContext;

 

// Returns the managed object model for the application.
// If the model doesn't already exist, it is created from the application's model.
- (NSManagedObjectModel *)managedObjectModel

if (_managedObjectModel != nil) 
    return _managedObjectModel;


   NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"IXCoreDataModel" withExtension:@"momd"];
  _managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
  return _managedObjectModel;



- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
  

 if (_persistentStoreCoordinator != nil) 
    return _persistentStoreCoordinator;


NSURL *storeURL = [[self applicationDocumentsDirectory]   URLByAppendingPathComponent:@"Inxed.sqlite"];

 NSError *error = nil;
_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) 
    /*
     */
    NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
    abort();


return _persistentStoreCoordinator;


 #pragma mark - Application's Documents directory

// Returns the URL to the application's Documents directory.
   - (NSURL *)applicationDocumentsDirectory
    

   return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory   inDomains:NSUserDomainMask] lastObject];

  

FetchedResultsController

  -(NSFetchedResultsController*)fetchedResultsController


if (_fetchedResultsController != nil) 
    return _fetchedResultsController;


NSString *loginUser=[[NSUserDefaults standardUserDefaults] valueForKey:@"currentUser"];

AppDelegate *sharedDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [sharedDelegate managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
[fetchRequest setReturnsObjectsAsFaults:NO];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"ThreadInfo"
                                          inManagedObjectContext:context];
[fetchRequest setEntity:entity];

NSSortDescriptor *sort = [[NSSortDescriptor alloc]
                          initWithKey:@"threadDate" ascending:NO];
[fetchRequest setSortDescriptors:[NSArray arrayWithObject:sort]];


NSPredicate *threadPredicate = [NSPredicate predicateWithFormat:@"userEmail == %@",loginUser];
// NSPredicate *providerPredicate = [NSPredicate predicateWithFormat:@"isReceiver == YES"];
//  NSPredicate *compoundPredicate = [NSCompoundPredicate andPredicateWithSubpredicates: @[threadPredicate, providerPredicate]];
[fetchRequest setPredicate:threadPredicate];
[fetchRequest setFetchBatchSize:20];
NSFetchedResultsController *theFetchedResultsController =
[[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest
                                    managedObjectContext:context sectionNameKeyPath:nil
                                               cacheName:nil];
_fetchedResultsController = theFetchedResultsController;
_fetchedResultsController.delegate = self;

return _fetchedResultsController;

崩溃代码

     - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
 

  ThreadInfo *info=[_fetchedResultsController objectAtIndexPath:indexPath];


if([info.isSystemMessage boolValue])// CRASH CoreData: error: NULL _cd_rawData but the object is not being turned into a fault

    

    return 178+90+25;


 else 


    return 178;

得到

  CoreData: error: Serious application error.  An exception was caught from the delegate of NSFetchedResultsController during a call to -controllerDidChangeContent:.  Only run on the main thread! with userInfo (null)

当滚动到最后一个单元格时，我也遇到了崩溃，单元格中没有任何内容。

【问题讨论】：

如果您将导入包装到上下文 performBlock 中是否有帮助？

此外，您是否知道保存上下文不会传播到持久存储，它只会保存一个级别:)

其实我不是很清楚。我的问题是将数据保存到核心数据应用程序变得很慢。所以我确实搜索了堆栈溢出并找到了需要使用多线程的解决方案。可以看到代码父子上下文。

@Muhsina Muhammed：请尝试添加异常断点。并让我们知道哪条线路导致了异常。你知道怎么做吗？

是的，但是您已经设置了上下文的并发类型，因此它现在已分配到另一个线程。删除您的调度块，而是将所有代码移动到后台上下文的 performBlock 方法中

【参考方案1】：

确保将上下文保存在 performBlock 方法中，例如

[mainContext performBlock^
    [mainContext save:&error];
];

另请参阅this thread

【讨论】：

是的，我做到了。但仍然没有从 coredata 获取和更新 tableview 的数据。

有时数据加载后出现此错误：CoreData: error: NULL _cd_rawData but object is not being turn into a fault