小编Fra*_*sco的帖子

我两天来一直在努力解决一个奇怪的问题.我在SO上经历了所有相关问题但没有一个解决了这个问题.我正在研究Xcode5.我正在使用ARC和CoreData.

在iOS7(模拟器)上:

`[CFString release]: message sent to deallocated instance`

Thread 1, Queue : com.apple.main-thread
0   0x03c7d3ba in __kill ()
1   0x03c7c4b8 in kill$UNIX2003 ()
2   0x0347a921 in ___forwarding___ ()
3   0x0347a4ee in _CF_forwarding_prep_0 ()
4   0x02b7b002 in -[NSConcreteAttributedString dealloc] ()
5   0x02f66692 in objc_object::sidetable_release(bool) ()
6   0x02f65e81 in objc_release ()
7   0x02f66ce7 in (anonymous namespace)::AutoreleasePoolPage::pop(void*) ()
8   0x00739bc4 in CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) ()
9   0x0345253e in __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ ()
10  0x0345248f in __CFRunLoopDoObservers ()
11  0x034303b4 in __CFRunLoopRun ()
12 …

我已经对这个问题进行了几个小时的故障排除,到目前为止没有成功.我已经在这里阅读了所有可能与我的问题有关的问题.

我有两个实体(A,B)通过像这样的一对多关系以树状结构相互连接:A <--- >> B.

有一个由NSFetchedResultsController支持的UITableViewController,用于显示与实体A的选定对象相关的实体B的所有对象.我正在使用谓词:

    - (NSFetchedResultsController *)fetchedResultsController
{
if (_fetchedResultsController != nil) {
    return _fetchedResultsController;
}

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"B" inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];

[fetchRequest setFetchBatchSize:20];

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"controlDate" ascending:NO];
NSArray *sortDescriptors = @[sortDescriptor];
[fetchRequest setSortDescriptors:sortDescriptors];

NSMutableArray *subpredicates = [NSMutableArray array];
NSPredicate *predicate1 = [NSPredicate predicateWithFormat:@"isRelatedTo = %@", selectedObjectOfA];
[subpredicates addObject:predicate1];
NSPredicate *predicate2 = [NSPredicate predicateWithFormat:@"syncStatus != %d", ObjectDeleted];
[subpredicates addObject:predicate2];

NSPredicate *predicate = [NSCompoundPredicate andPredicateWithSubpredicates:subpredicates];
[fetchRequest setPredicate:predicate];

NSFetchedResultsController …