I’m iterating a protocol’s property list (using protocol_copyPropertyList.) For
each property, I want to know whether it was declared as @optional; but I can’t
figure out how to do this.
The closest I’ve come is to call protocol_getProperty, passing in the protocol,
the property’s name, and YES for both isRequiredProperty and isInstanceProperty:
BOOL isOptional = (protocol_getProperty(protocol, name, YES, YES) ==
NULL);
Unfortunately this doesn’t work; the function never returns NULL, even for an
optional property. Changing the value of isRequiredProperty to NO doesn’t help;
then the function _always_ returns NULL.
There aren’t any other functions defined in <objc/runtime.h> that look at all
relevant, and the property’s attribute string doesn’t include any extra
parameter indicating it’s optional, so I’m stumped. Anyone know?
—Jens
PS: This is on OS X 10.10.3, in a 64-bit process.
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