Ios deleteRowsAtIndexPaths冻结UITableView

我有一个带有核心数据的

UITableView

当我插入新记录或更新现有记录时，一切正常，

UITableView

会自动更新，但当我删除记录时，

UITableView

会冻结，直到重新加载

UIView

有人知道出了什么问题吗

- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller
{
    [self.tableView beginUpdates];
}

- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
           atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type
{
    switch(type) {
        case NSFetchedResultsChangeInsert:
            [self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeDelete:
            [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}

- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
       atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
      newIndexPath:(NSIndexPath *)newIndexPath
{
    UITableView *tableView = self.tableView;

    switch(type) {
        case NSFetchedResultsChangeInsert:
            [tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeDelete:
            [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeUpdate:
            [tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];

            break;

        case NSFetchedResultsChangeMove:
            [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
            [tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
    [self.tableView endUpdates];
}

---

当我删除调度队列时，一切正常。

在删除行的情况下，您是否尝试过self.tableview结束更新。这可能会结束动画。仅仅是一个想法就好像你的开始和结束更新可能不是成对的。您是否尝试将对它们的每次调用都记录在语句旁边，然后在日志中查看它们是否以正确的顺序成对出现？@nspremident当我设置一些断点时，它首先命中controllerWillChangeContent。然后点击deleteRowsAtIndexPaths。最后，它会点击controllerDidChangeContent。看起来顺序正确。您能演示一下如何删除行吗？为什么使用调度队列？

- (void)refreshData
{
    dispatch_queue_t fetchQ = dispatch_queue_create("Data Fetch", NULL);
    dispatch_async(fetchQ, ^{

        // here I delete some records            

        dispatch_async(dispatch_get_main_queue(), ^(void) {
            [self saveContext];
        });
    });
}
- (void)saveContext
{
    NSError *error = nil;
    NSManagedObjectContext *managedObjectContext = self.managedObjectContext;
    if (managedObjectContext != nil) {
        if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error]) {
             // Replace this implementation with code to handle the error appropriately.
             // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. 
            NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
            abort();
        } 
    }
}