Question

我正在从我的fetchResultsController加载一个User对象，从所述User获取一堆相关的Sites对象，将它们放入一个数组，排序，然后在UITableView中显示。

-(void)loadMainUser {

id <NSFetchedResultsSectionInfo> sectionInfo = [[self.fetchedResultsController sections] objectAtIndex:0];

if([sectionInfo numberOfObjects]) {

    NSUInteger indexArr[] = {0,0};
    NSIndexPath *indexSet = [NSIndexPath indexPathWithIndexes:indexArr length:2];
    mainUser = (User *)[self.fetchedResultsController objectAtIndexPath:indexSet];

    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"siteName" ascending:YES selector:@selector(caseInsensitiveCompare:)];
    NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:&sortDescriptor count:1];

    sortedMsgs = [[mainUser.sitesToUser allObjects] mutableCopy];
    [sortedMsgs sortUsingDescriptors:sortDescriptors];

    [sortDescriptor release];
    [sortDescriptors release];      
}

[self.theTableView reloadData];

}

现在我的方案是我要删除此User对象和相关站点。但是，每当我尝试保存删除时，我的应用程序都会因EXC_BAD_ACCESS错误而崩溃。这是我的删除代码：

-(void)deleteUser {

sortedMsgs = nil;
mainUser = nil;

NSUInteger indexArr[] = {0,0};
NSIndexPath *indexSet = [NSIndexPath indexPathWithIndexes:indexArr length:2];

NSManagedObjectContext *context = [self.fetchedResultsController managedObjectContext];

[context deleteObject:[self.fetchedResultsController objectAtIndexPath:indexSet]];
// Save the context.

NSError *error = nil;
if (![context save:&error]) {       
    NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
    abort();
} else {        
    // do something
}
}

我不完全确定为什么虽然......我注意到我的mainUser的保留计数为3，我假设是因为sortedMsgs和UITableView ...是因为我的UITableView仍然有效地显示数据用户，然后我删除它？真的很困惑......

这是崩溃日志：

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000016
Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Application Specific Information:
objc_msgSend() selector name: isTemporaryID
iPhone Simulator 235, iPhone OS 4.2 (iPhone/8C134)

Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
0   libobjc.A.dylib                 0x01613a63 objc_msgSend + 23
1   CoreData                        0x00e20d26 -[NSManagedObjectContext save:] + 566
2   Clicky                          0x00002cfd -[RootViewController deleteUser] + 358 (RootViewController.m:71)
3   UIKit                           0x003eaa6e -[UIApplication sendAction:to:from:forEvent:] + 119
4   UIKit                           0x005f8167 -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 156
5   UIKit                           0x003eaa6e -[UIApplication sendAction:to:from:forEvent:] + 119
6   UIKit                           0x004791b5 -[UIControl sendAction:to:forEvent:] + 67

Answer 1

我唯一想到的是你可能正在删除与另一个对象有必需关系的对象。检查数据模型中的关系？

完全是一种预感。

核心数据deleteObject使用EXC_BAD_ACCESS崩溃应用程序

1 个答案: