错误： - [UIImage _deleteExternalReferenceFromPermanentLocation]无法识别的选择器发送到实例 [英] Error: -[UIImage _deleteExternalReferenceFromPermanentLocation] unrecognized selector sent to instance

问题描述

当我删除包含图像的托管对象时，在外部记录中存储为可变换值，那么我会崩溃并显示此错误：

When I delete a managed object that contains image, stored as transformable value in external record, then I got crash and this error:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIImage _deleteExternalReferenceFromPermanentLocation]: unrecognized selector sent to instance 0xde49360' 

推荐答案

我回答了类似于 Apple开发人员论坛。

我猜您在数据建模器的该字段上选中了外部存储复选框。

I answered to something similar in the Apple Developer forums.
I am guessing you have the external storage checkbox selected on that field in the data modeller.

有一个错误可以解决。我这样做：

一旦你更新了数据并保存了上下文，任何删除它的尝试都会引发这个无法识别的选择器异常。

强制正确对象可以响应_deleteExternalReferenceFromPermanentLocation消息，请执行以下操作：

There is a bug in that can be worked around. I did it like this:
Once you have updated your data, and saved the context, any attempt to delete it will raise this 'unrecognized selector' exception.
To force the correct object that can respond to the _deleteExternalReferenceFromPermanentLocation message, do this:

[[self managedObjectContext] refreshObject:myobject mergeChanges:NO];

对象变成故障。当您下次访问它或删除它时，外部数据将被如期删除，因为包装外部数据的正确对象将从存储中提取，并会正确响应_deleteExternalReferenceFromPermanentLocation。

The object turns into a fault. When you next access it, or delete it, the external data is deleted as expected as the correct object that wraps your external data will be pulled from the store and will correctly respond to _deleteExternalReferenceFromPermanentLocation.

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