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core-datanskeyedunarchiver

Core Data message Unable to find an instance of NSValueTransformer registered for the name: NSKeyedUnarchiveFromDataTransformerName

I am using Core Data to store NSAttributedString and use a transformable field to store the data. However I get the message below from Core Data, although everything seems to work fine. How can I get rid of the message or can I safely ignore it.

Unable to find an instance of NSValueTransformer registered for the name: NSKeyedUnarchiveFromDataTransformerName
Solution

  • It seems that the transformer class name has been set to NSKeyedUnarchiveFromDataTransformerName, and that a class with that name doesn't exist.

    You'll either need to remove that class name and a default serialiser will be used or you need to create that class and have it perform some custom archiving.