核心数据错误：_Unwind_Resume从函数中调用_PFFaultHandlerLookupRow在图像CoreData

问题描述

我从核心日期得到这个奇怪的错误，我不明白为什么。

当我删除一行UITableView时，执行下面的代码。

我传递一个字符串和一个对象到下面的方法，它获取一个数据库表中有该字符串并有该对象的外键的文章。

 
  - （void）deleteFavorite：（NSString *）link inFolder：（Favorites *）f {
 NSFetchRequest * request = [[NSFetchRequest alloc] init]; 
 NSEntityDescription * favsDecriptor = [NSEntityDescription entityForName：@FavoritesinManagedObjectContext：context]; 
 [request setEntity：favsDecriptor]; 
 NSPredicate * predicate = [NSPredicate predicateWithFormat：@（belongsTo ==％@）AND（link =％@），f，link]; 
 [request setPredicate：predicate]; 
 
 NSError * error = nil; 
 NSMutableArray * fav = [[NSMutableArray alloc] init]; 
 fav = [[context executeFetchRequest：request error：&error] retain]; 
 if（！[context save：&error]）{
 NSLog（@无法从抓取请求中抓取故事。 
} 
 
 NSLog（[[fav objectAtIndex：0] title]）; 
 error = nil; 
 [context deleteObject：[fav objectAtIndex：0]]; 
 if（！[context save：&error]）{
 NSLog（@无法删除fav！％@，错误） 
} 
} 
 

应用程序即时崩溃，我在控制台中收到此消息。
但是当我启动应用程序后，该行已被删除。

 
检测到尝试调用系统库中的符号这是不存在的iPhone：
 _Unwind_Resume从图像CoreData中的函数_PFFaultHandlerLookupRow调用。 
 
 
 
 
请帮助！
 
提前感谢大家！
解决方案
有可能是您持有对删除对象的引用，或者被删除的对象是观察者，并且在被删除后获得回调 ？我最近有类似的东西，虽然略有不同的错误消息。在我的情况下，我也崩溃删除（在某些情况下），但当我重新启动对象被删除已经，事实上，已删除。
 
 
 
如果您还没有这样做，在运行菜单下选择停止对Objective-C异常。这帮助我跟踪我的崩溃的根本原因。在我的情况下，它是KVO观察器获得回调的属性的删除NSManagedObject的值的变化。
 


I'm getting this weird error from Core Date and I cant understand why.

The code below is executed when I delete a row of a UITableView.

I pass a string and an object to the method below and it fetches the article in a database table that has that string and has a foreign key to that object. Then I delete that object and reload the table.
- (void)deleteFavorite:(NSString *)link inFolder:(Favorites *)f {
    NSFetchRequest *request = [[NSFetchRequest alloc] init];
    NSEntityDescription *favsDecriptor = [NSEntityDescription entityForName:@"Favorites" inManagedObjectContext:context];
    [request setEntity:favsDecriptor];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(belongsTo == %@) AND (link = %@)", f, link];
    [request setPredicate:predicate];

    NSError *error = nil;   
    NSMutableArray *fav = [[NSMutableArray alloc] init];
    fav = [[context executeFetchRequest:request error:&error] retain];
    if (![context save:&error]) {
        NSLog(@"Cannot fetch the story from the fetch request.");
    }

    NSLog([[fav objectAtIndex:0] title]);
    error = nil;
    [context deleteObject:[fav objectAtIndex:0]];
    if (![context save:&error]) {
        NSLog(@"Can't delete the fav! %@", error);
    }
}
The app instantly crashes and I get this message in the console.But when I launch the app afterwards, the row has been deleted.
Detected an attempt to call a symbol in system libraries that is not present on the iPhone:
_Unwind_Resume called from function _PFFaultHandlerLookupRow in image CoreData.
Please help!
Thanks in advance to everyone!
 解决方案 
Is it possible that you are holding a reference to the delete object or that the deleted object is an observer and is getting a callback after its been deleted? I had something similar to this recently, though slightly different error message. In my case, I also crashed upon deletion (under some conditions) but when I relaunched the object-to-be-deleted had, in fact, been deleted.
If you haven't already done so, under the Run menu select Stop on Objective-C Exceptions. This helped me track down the root cause of my crash. In my case it was KVO observer getting callback of change of value of a property of deleted NSManagedObject.
                        
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