Getting metadata for property in category.

PropInCat.m

#import <Foundation/Foundation.h>
#import <objc/runtime.h>

@interface Rigby : NSObject
@end

@implementation Rigby
@end

@interface Rigby (Eleanor)

@property (nonatomic, copy) NSString * jarByTheDoor;
@property (nonatomic, copy) NSString * riceInTheChurch;

@end

@implementation Rigby (Eleanor)

@dynamic jarByTheDoor;

- (NSString *)riceInTheChurch
{
    return @"";
}

- (void)setRiceInTheChurch:(NSString *)riceInTheChurch
{
    return;
}

@end

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        
        objc_property_t jar = class_getProperty([Rigby class], "jarByTheDoor");
        NSLog(@"%s", property_getAttributes(jar));
        
        objc_property_t rice = class_getProperty([Rigby class], "riceInTheChurch");
        NSLog(@"%s", property_getAttributes(rice));
        
    }
    return 0;
}