macOS Custom Attributes for Object in Interface Builder

[aliher]

Hi,

I'm trying to define properties of custom objects in Interface Builder.
I can see it in the manual for IB 3.2, but not in the IB 3.1 which I use in 10.5. Is it a new feature or I'm just looking in the wrong place? I don't see "User Defined Runtime Attributes" on the identity tab at all.
What I want to achieve is add several custom formatter objects with attributes which I want to define in the IB. Or it sounds like a completely incorrect approach to the problem and data should be validated by view controller only?

 

[szymczyk]

User-Defined runtime attributes were added in Interface Builder 3.2.

 

[aliher]

User-Defined runtime attributes were added in Interface Builder 3.2.

Are there any other ways to configure those objects other than having as many classes as fields on a form?