我正在使用XMPP創建一個FBChat.I爲coredata和fetchedResults創建了單獨的類。核心數據委託方法不止一次調用
CoreDataClass:
@implementation CoreDataClass
@synthesize managedObjectContext = __managedObjectContext;
@synthesize managedObjectModel = __managedObjectModel;
@synthesize persistentStoreCoordinator = __persistentStoreCoordinator;
- (NSManagedObjectContext *)managedObjectContext
{
if (__managedObjectContext != nil)
{
return __managedObjectContext;
}
NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
if (coordinator != nil)
{
__managedObjectContext = [[NSManagedObjectContext alloc] init] ;
[__managedObjectContext setPersistentStoreCoordinator:coordinator];
}
return __managedObjectContext;
}
- (NSManagedObjectModel *)managedObjectModel
{
if (__managedObjectModel != nil)
{
return __managedObjectModel;
}
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"Chat" withExtension:@"momd"];
__managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
return __managedObjectModel;
}
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
if (__persistentStoreCoordinator != nil)
{
return __persistentStoreCoordinator;
}
AppDelegate *delegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSURL *storeURL = [[delegate applicationDocumentsDirectory] URLByAppendingPathComponent:@"FacebookChat.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;
}
- (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();
}
}
}
FetchedControlClass:在MainChatClass兩類
@implementation FetchedControllClass
@synthesize fetchedResultsController;
#pragma mark Fetched Results
- (NSFetchedResultsController *)fetchedResultsController
{
CoreDataClass *coreDataObject=[[CoreDataClass alloc]init];
if (fetchedResultsController != nil) {
return fetchedResultsController;
}
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Conversation" inManagedObjectContext:coreDataObject.managedObjectContext];
[fetchRequest setEntity:entity];
[fetchRequest setFetchBatchSize:20];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"facebookName" ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObjects:sortDescriptor, nil];
[fetchRequest setSortDescriptors:sortDescriptors];
[sortDescriptor release];
NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:coreDataObject.managedObjectContext sectionNameKeyPath:nil cacheName:@"Master"] ;
[fetchRequest release];
aFetchedResultsController.delegate = self;
self.fetchedResultsController = aFetchedResultsController;
[aFetchedResultsController release];
NSError *error = nil;
if (![self.fetchedResultsController performFetch:&error]) {
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
[coreDataObject release];
return fetchedResultsController;
}
- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller
{
AlertListVC *alertListObject=[[AlertListVC alloc]initWithNibName:@"AlertListVC" bundle:nil];
[alertListObject.tableView beginUpdates];
[alertListObject release];
}
- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type
{
AlertListVC *alertListObject=[[AlertListVC alloc]initWithNibName:@"AlertListVC" bundle:nil];
switch(type) {
case NSFetchedResultsChangeInsert:
[alertListObject.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
break;
case NSFetchedResultsChangeDelete:
[alertListObject.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
break;
}
[alertListObject release];
}
- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
newIndexPath:(NSIndexPath *)newIndexPath
{
AlertListVC *alertListObject=[[AlertListVC alloc]initWithNibName:@"AlertListVC" bundle:nil];
UITableView *tableView = alertListObject.tableView;
switch(type) {
case NSFetchedResultsChangeInsert:
[tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
break;
case NSFetchedResultsChangeDelete:
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
break;
case NSFetchedResultsChangeUpdate:
[alertListObject configureCell:[tableView cellForRowAtIndexPath:indexPath] atIndexPath:indexPath];
break;
case NSFetchedResultsChangeMove:
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
[tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath]withRowAnimation:UITableViewRowAnimationFade];
break;
}
[alertListObject release];
}
- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
AlertListVC *alertListObject=[[AlertListVC alloc]initWithNibName:@"AlertListVC" bundle:nil];
[alertListObject.tableView endUpdates];
[alertListObject release];
}
我做了對象,並添加來自coredata的談話ConversationClass
Conversation *conversation = (Conversation *)[NSEntityDescription
insertNewObjectForEntityForName:@"Conversation"
inManagedObjectContext:coreDataClassObject.managedObjectContext];
我能獲取fetchedResults但 問題是: Coredata方法得到了兩次調整(所以文件創建兩次)。如果我選擇朋友聊天,那麼應用程序將崩潰。我用殭屍來追蹤問題。它顯示了一些錯誤, 負責來電者: 1 MainChatClass的tableView:didSelectRowAtIndexPath方法] 2 NSFetchedResultsController(私有方法)_managedObjectContextDidChange]
我試過很多次,但仍然得到這些方法的錯誤。 如果有人有這個想法,那麼請幫助我。 在此先感謝
感謝您的回答。我已將取控制器委託方法放入主類中,並解決了此問題。 – Anand
@Anand:我很高興聽到這個消息。如果我的答案有幫助,您應該點擊答案左側的複選標記以「接受」答案。 –