Storing NSAttributedString Core Data

Asked 2010-11-24T11:26:47.417

I am trying to store an NSAttributedString to a Core Data SQL store.

I have the property set as a "transformable", it is optional and it is NOT transient or indexed and the value transformer name is set to default "NSKeyedUnarchiveFromData". In the .xcdatamodel and generated the managed object class which has this in the .h:

@property (nonatomic, retain) id Text; (I have tried changing id to NSAttributedString *Text)

and this in the .m:

@dynamic Text;

I look through and set the ".text" property of my NSManagedObject to the attributed string then when completed I do:

NSError *error = nil;
[managedObjectContext save:&error];

This through is causing this error in the output:

[NSCFType encodeWithCoder:]: unrecognized selector sent to instance 0xc04edb0 Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[NSCFType encodeWithCoder:]: unrecognized selector sent to instance 0xc04edb0'

I have checked the class of what I am storing to the property and it is NSAttributedString also I check responsesToSelector @selector(:) and this returns true so very confused as this is contrary to the error message?

Please advise.

Thanks James

Edit Report

2 Answers

Another idea would be to create a Custom Class of NSAttributedString and somewhere use enumerateAttributesInRange:options:usingBlock: to get all the attributes of the string and then save the NSDictionary with the attributes and ranges in to Core Data aswell as the attributed string stripped of it's attributes.

Then when the string is loaded again you could apply the attributes that are in the dictionary to the attributed string using initWithString:attributes:.

answered 2010-11-25T17:08:45.313

-1

OK... Some kind of break through although not a good one...

If we NSLog the attributed string then we can see in there it has NSFont and NSParagraphStyle in. Although these are NOT NSFont and NSParagraphStyle in the code these are CTFontRef and CT Dictionaries of paragraph styles... These are not NS objects although in NSLog they output as these and therefore guess that is why we can not perform the "encodeWithCoder" selector on the object.

IF in the code we just do "NSFont;" the compiler says "NSFont undeclared" so what can we do as we only have the CT functions?

As my colleague said in the comments above if we set the ".text" property to just "NSAttrinutedString *string = [NSAttributedString alloc] initWithString:@"test"] it saves fine and if we remove all the styling from the one we WANT to save it also works!

THERE MUST BE A WAY OF STORING NSATTRIBUTED STRING WITH STYLING INTO CORE DATA... NO?

Any ideas greatly appreciated.

-JM

answered 2010-11-24T15:18:13.310

Storing NSAttributedString Core Data

2 Answers

Your Answer