On Feb 21, 2009, at 5:57 AM, David Niemeijer wrote:
I have an NSImageView and in IB have set it up so that it binds on
"Value Path". Everything works fine, but when I subclass
NSImageView and in my subclass want to get info about the binding
and use [self infoForBinding:@"Value Path"] (or when I instead have
bound to "Valueurl" use [self infoForBinding:@"Valueurl"]) the
result is NULL. Does IB name the bindings differently?
Yes, IB is presenting "display names" for the bindings. The bindings
for AppKit-provided classes are documented, using their real names, in
the Cocoa Bindings Reference:
http://developer.apple.com/documentation/Cocoa/Reference/CocoaBindingsRef/
The page for NSImageView shows bindings called "valuePath" and
"valueURL". (In general, AppKit uses naming conventions similar to
those for property names for its bindings.)
The NSKeyValueBindingCreation protocol reference documents string
constants for AppKit-defined bindings. So, for the above two
bindings, you should use NSValuePathBinding and NSValueURLBinding.
Is there a way to query an object and get back an array of current
binding names?
A class _may_ expose its bindings through the -exposedBindings and
+exposeBinding: methods, but this is optional. It's not required to
make a binding work, but it does allow IB to know about the binding.
Cheers,
Ken
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