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


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

By : user2950149
Date : November 17 2020, 11:52 AM
Does that help 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.
code :


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Why is my transformable Core Data attribute not using my custom NSValueTransformer?

Why is my transformable Core Data attribute not using my custom NSValueTransformer?


By : Rajesh
Date : March 29 2020, 07:55 AM
To fix this issue It turns out that this is actually a bug in the frameworks. See this post by an Apple employee on the Cocoa-Dev mailing list:
http://lists.apple.com/archives/Cocoa-dev/2009/Dec/msg00979.html
NSValueTransformer for C structs in Core Data

NSValueTransformer for C structs in Core Data


By : jsfrnc
Date : March 29 2020, 07:55 AM
like below fixes the issue How do I create a NSValueTransformer for a C struct, such as a CGRect in Core Data? , Use NSValue to wrap C pointers.
code :
[NSValue valueWithPointer:&struct]
[NSValue valueWithCGRect:rect]
iOS Core Data encryption using NSValueTransformer

iOS Core Data encryption using NSValueTransformer


By : Tariqul Islam
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I finally figured it out... I was confused as to what type very object had to be and what my nsvaluetransformer had to return. I wasnt casting the value to the proper type in the nsvaluetransformer and thus I was returning nil in the code. However it wasnt crashing in a way that I would easily figure this out. Secondly I changed the entity column back to an NSObject. Returned an NSData object in the transformedValue method and a NSString in the reverseTransformedValue method. This was actually all i needed to make it work. a lot for your help. It indeed was a type error.
Where to implement NSValueTransformer for Core Data in Swift

Where to implement NSValueTransformer for Core Data in Swift


By : Madhusudhan
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further The "where" is just anywhere in your project. Anywhere that ensures that your NSValueTransformer subclass will exist at run time. Implement the NSValueTransformer subclass, and enter the class name in the Core Data model as the value transformer.
However there is a default transformer. Any class that adopts the NSCoding protocol can be automatically transformed by Core Data. In that case you mark the attribute as transformable but don't include a class name. This includes NSURL, so you don't need to transform that or convert it to a string.
Transform String to Core Data by NSValueTransformer

Transform String to Core Data by NSValueTransformer


By : Daniel Cliff
Date : March 29 2020, 07:55 AM
seems to work fine Currently Core Data can only transform to NSData. The default transformer can handle transforming an array of strings to NSData by setting the attribute type to transformable and that's the only configuration required.
Personally I would like Core Data in the future to allow transformation to a string, so for example when using a SQLite browser the record field is human-readable instead of being a binary plist.
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