iOS - 未解决的错误导致崩溃:悬挂对无效对象的引用
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【中文标题】iOS - 未解决的错误导致崩溃:悬挂对无效对象的引用【英文标题】:iOS - Unresolved error causes crash: Dangling reference to an invalid object 【发布时间】:2012-09-21 09:19:52 【问题描述】:我在 ios 上遇到以下崩溃:
Unresolved error Error Domain=NSCocoaErrorDomain Code=1550 "The operation couldn’t be completed. (Cocoa error 1550.)" UserInfo=0x74a30d0 NSValidationErrorObject=<Exercise: 0x9097d50> (entity: Exercise; id: 0x9097970 <x-coredata://AF762754-4CD9-4386-A453-049CC8710DBF/Exercise/p124> ; data:
groupId = 21;
id = 102;
intensity = "0x906a7a0 <x-coredata://AF762754-4CD9-4386-A453-049CC8710DBF/Intensity/p125>";
lengthMeasurable = 1;
name = Running;
owner = "0x9096540 <x-coredata:///ExerciseEvent/t6817E9A9-9A4C-4044-BF20-FC15380B7C2F4>";
picId = 2719;
), NSAffectedObjectsErrorKey=(
"<ExerciseEvent: 0x9090910> (entity: ExerciseEvent; id: 0x9096540 <x-coredata:///ExerciseEvent/t6817E9A9-9A4C-4044-BF20-FC15380B7C2F4> ; data: <fault>)"
), Dangling reference to an invalid object.=null, NSValidationErrorKey=owner, NSLocalizedDescription=The operation couldn’t be completed. (Cocoa error 1550.), NSValidationErrorValue=<ExerciseEvent: 0x9090910> (entity: ExerciseEvent; id: 0x9096540 <x-coredata:///ExerciseEvent/t6817E9A9-9A4C-4044-BF20-FC15380B7C2F4> ; data: <fault>),
"Dangling reference to an invalid object." = "<null>";
NSAffectedObjectsErrorKey = (
"<ExerciseEvent: 0x9090910> (entity: ExerciseEvent; id: 0x9096540 <x-coredata:///ExerciseEvent/t6817E9A9-9A4C-4044-BF20-FC15380B7C2F4> ; data: <fault>)"
);
NSLocalizedDescription = "The operation couldn\U2019t be completed. (Cocoa error 1550.)";
NSValidationErrorKey = owner;
NSValidationErrorObject = "<Exercise: 0x9097d50> (entity: Exercise; id: 0x9097970 <x-coredata://AF762754-4CD9-4386-A453-049CC8710DBF/Exercise/p124> ; data: \n groupId = 21;\n id = 102;\n intensity = \"0x906a7a0 <x-coredata://AF762754-4CD9-4386-A453-049CC8710DBF/Intensity/p125>\";\n lengthMeasurable = 1;\n name = Running;\n owner = \"0x9096540 <x-coredata:///ExerciseEvent/t6817E9A9-9A4C-4044-BF20-FC15380B7C2F4>\";\n picId = 2719;\n)";
NSValidationErrorValue = "<ExerciseEvent: 0x9090910> (entity: ExerciseEvent; id: 0x9096540 <x-coredata:///ExerciseEvent/t6817E9A9-9A4C-4044-BF20-FC15380B7C2F4> ; data: <fault>)";
我在某个时刻遇到了这个崩溃,那就是我想将我的模型 ExerciseEvent
保存在 CoreData
中。所以我在我的视图中创建了一个这样的新实体:
self.ee = [NSEntityDescription insertNewObjectForEntityForName:@"ExerciseEvent" inManagedObjectContext:context]
然后我有 2 个按钮,“保存”和“放弃”。如果我按“放弃”,我必须删除该实体,这样我就不会在上下文中得到一个可为空的 ExerciseEvent
。我在视图中这样删除:
[context deleteObject:self.ee];
[context save:nil];
然后,当我打开所有ExerciseEvents
的列表时,如上所述,我遇到了以下崩溃。
【问题讨论】:
【参考方案1】:这个错误通常是因为当一个Excercise 对象没有与ExerciseEvent 建立必要的互惠关系时,关系设置不正确。您正在尝试删除对象 ExerciseEvent。 而Exercise对象和这个ExerciseEvent有关系,不能和这个有空关系,但是当你删除ExerciseEvent时,会出现错误。 该对象是“悬空的”,因为对象图表明它应该处于关系中,但它只是悬挂在与任何其他对象无关的空间中。
所以你需要做的是在对象ExerciseEvent和Exercise之间设置正确的关系删除规则。应该有级联规则。您可以在这里找到详细信息:https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CoreData/Articles/cdRelationships.html
【讨论】:
谢谢伙计,就是这样!我对 CoreData 中的删除没有任何操作,我将其更改为 Cascade :)以上是关于iOS - 未解决的错误导致崩溃:悬挂对无效对象的引用的主要内容,如果未能解决你的问题,请参考以下文章