iphone - CoreData : error: Serious application error. 核心数据更改处理期间捕获到异常

Question

我在开发我的 iPhone 应用程序时遇到了重大问题。

这是完整的错误:

CoreData: error: Serious application error.  Exception was caught during Core Data 
change processing.  This is usually a bug within an observer of 
NSManagedObjectContextObjectsDidChangeNotification.  -[TimeSpentStudying coordinate]:
unrecognized selector sent to instance 0x21db92d0 with userInfo (null)

这很奇怪，因为我有两个 coreData 实体(Locations 和 TimeSpentStudying)。但我不认为那些是问题。 [TimeSpentStudying coordinate] 很奇怪，因为我没有在 TimeSpentStudying 核心数据类上发送 coordinate 属性

我设置了一个 mapView，当用户点击 mkannotationview 上的详细信息披露按钮时，会弹出一个新 View (LibraryTrackTimeViewController)，但几乎无法使用。我尝试在 viewDidLoad 中调用 NSLog，但没有任何显示。

mapViewController.m

#pragma mark - NSNotification

- (void)contextDidChange:(NSNotification *)notification
{
  if ([self isViewLoaded]) {
    [self updateLocations];
}

.

- (void)updateLocations
{
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Location" inManagedObjectContext:self.managedObjectContext];

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
[fetchRequest setEntity:entity];

NSError *error;
NSArray * foundObjects = [self.managedObjectContext executeFetchRequest:fetchRequest error:&error];
    if (foundObjects == nil) {
    FATAL_CORE_DATA_ERROR(error);
    return;
    }

    if (locations != nil) {
    [self.mapView removeAnnotations:locations];
    }

locations = foundObjects;
[self.mapView addAnnotations:locations];

-(void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self
    name:NSManagedObjectContextObjectsDidChangeNotification
    object:self.managedObjectContext];
}

我认为错误可能与 mapViewController.m 中的 prepareForSegue 方法有关

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
  if (distance < 500) {
  if ([segue.identifier isEqualToString:@"TrackLibraryTimes"]) {
    UINavigationController *navigationController = segue.destinationViewController;

LibraryTrackTimeViewController *controller = (LibraryTrackTimeViewController *)navigationController.topViewController;
controller.managedObjectContext = self.managedObjectContext;
  }
 }}

我为粗略的语法道歉，我只是习惯了 SO，如果您需要更多代码，请告诉我，谢谢大家。

Answer 1

我有同样的错误，由于

-(void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath

case NSFetchedResultsChangeInsert:
            //[self.tableView insert
            NSLog(@"change insert");
            [self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
            break;

我使用了 indexPath 而不是 newIndexPath。