调试 NSObjectInaccessibleException 错误。对象的 ManagedObjectContext 变为零？
我有一个简单的 iPhone 应用程序，其中包含一对多礼物与收件人的关系（即，一个收件人可以收到许多礼物，但每件礼物必须发送给一个收件人。为了在礼物和收件人之间创建关系，我正在创建首先在托管对象上下文中创建一个新的收件人对象，将新的控制器的收件人对象设置为新的收件人，然后将新的控制器弹出到导航控制器上，当新的控制器返回时，我将新的收件人分配给礼物
。该交易的代码：
RecipientEditController *nextController = [
[RecipientEditController alloc]
initWithStyle:UITableViewStyleGrouped
];
Recipient *new = [NSEntityDescription
insertNewObjectForEntityForName:@"Recipient"
inManagedObjectContext:gift.managedObjectContext
];
[new addGiftsObject:gift];
nextController.recipient = new;
nextController.recipient.hideRelationships = YES;
[self.navigationController pushViewController:nextController animated:YES];
if ([new hasData]) {
gift.recipient = new;
} else {
[gift.managedObjectContext deleteObject:new];
}
break;
在新控制器中，接收者对象似乎运行正常；我可以在 ViewWillAppear 方法中打印收件人的描述，但是当我到达 tableView:cellForRowAtIndexPath 方法时，我的收件人对象不再有效：它的 ManagedObjectContextProperty 为 nil，并且调用recipient.firstName。 （在模型类和数据库中定义的属性），抛出错误。
错误：
2011-11-30 17:22:18.111 Gift Hero[36359:b603] *** Terminating app due to uncaught exception 'NSObjectInaccessibleException', reason: 'CoreData could not fulfill a fault for '0x59e65c0 <x-coredata://97FDB78C-6F65-4B54-8DBB-00A9C6A4B4C8/Recipient/p21>''
知道发生了什么吗？这简直让我发疯！接收者如何在显示视图和显示表格之间无效？！
预先感谢，PT
I have a simple iphone application in with a one to many gift to recipient relationship (that is, one recipient can get many gifts, but each gift must go to one recipient. To create a relationship between a gift and a recipient, I am creating first creating a new recipient object in the managed object context, setting a new controller's recipient object to be the new recipient, and then popping the new controller onto the navigationController. When the new controller returns, I assign the new recipient to the gift.
The code for that transaction:
RecipientEditController *nextController = [
[RecipientEditController alloc]
initWithStyle:UITableViewStyleGrouped
];
Recipient *new = [NSEntityDescription
insertNewObjectForEntityForName:@"Recipient"
inManagedObjectContext:gift.managedObjectContext
];
[new addGiftsObject:gift];
nextController.recipient = new;
nextController.recipient.hideRelationships = YES;
[self.navigationController pushViewController:nextController animated:YES];
if ([new hasData]) {
gift.recipient = new;
} else {
[gift.managedObjectContext deleteObject:new];
}
break;
Within the new controller, the recipient object seems to operate normally; I can print a description of the recipient within the ViewWillAppear method. But when I get to the tableView:cellForRowAtIndexPath method, my recipient object is no longer valid: Its managedObjectContextProperty is nil, and a call to recipient.firstName (a property defined in the model class and in the database), an error is thrown.
Error:
2011-11-30 17:22:18.111 Gift Hero[36359:b603] *** Terminating app due to uncaught exception 'NSObjectInaccessibleException', reason: 'CoreData could not fulfill a fault for '0x59e65c0 <x-coredata://97FDB78C-6F65-4B54-8DBB-00A9C6A4B4C8/Recipient/p21>''
Any idea what's going on? This is literally driving me nuts! How can the recipient just invalidate between displaying the view and showing the table?!
Thanks in advance, PT
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好的，所以我想我已经弄清楚了。推送新的 viewController 似乎不会像调用另一个函数那样结束当前方法的执行。因此，当我在推送视图控制器后删除对象时，它会删除另一个视图控制器中的对象。我不太明白这背后的逻辑，但事实就是如此......
Ok, so I think I've figured this out. Pushing a new viewController does NOT seem to end execution of the current method, like calling another function might. So when I delete the object after pushing the view controller, it is deleting the object in the other view controller. I don't really understand the logic behind this, but it is what it is...