Re: How to store NSRect as Core Data attribute?
Re: How to store NSRect as Core Data attribute?
- Subject: Re: How to store NSRect as Core Data attribute?
- From: Ben Lachman <email@hidden>
- Date: Wed, 2 Apr 2008 12:12:41 -0400
I think the easiest way to encode/decode NSRects for storage is
NSStringFromRect() and NSRectFromString(). Then you can just
implement a custom accessor for the property that converts in the
direction you need.
->Ben
--
Ben Lachman
Acacia Tree Software
http://acaciatreesoftware.com
email@hidden
740.590.0009
On Apr 2, 2008, at 7:28 AM, Daniel Thorpe wrote:
Hello everyone,
I'm trying to get to grips with non-standard persistent attributes
in Core Data. I've read through the docs I can find (http://
developer.apple.com/documentation/Cocoa/Conceptual/CoreData/
Articles/cdNSAttributes.html) but I'm still having some issues
storing an NSRect in an entity. I've set the type to be
transformable, and left the value transformer field empty using the
model editor.
To actually set and get the NSRect values, I've been using
NSValue's valueWithRect: and rectValue methods. However, when CD
trys to saving the entities to the store, I get this error:
*** -[NSKeyedArchiver encodeValueOfObjCType:at:]: this archiver
cannot encode structs
I've also changed the property defined in the header file for the
entity to:
@property(retain) NSValue *extent;
from
@property(retain) id extent;
What am I doing wrong here? The docs seem to suggest for KVO/KVC
compliant structs, NSRect, NSPoint, NSSize and NSRange, you don't
need to overwrite the getters and setters?
Any help is much appreciated!
Cheers
Dan
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