Is there any introspection method to get all adopted protocols for a class in Objective-C?

Question

There is an -[NSObject conformsToProtocol:] method to check whether a specific protocol is adopted or not. Is there any method to get all adopted protocols for a class, rather than checking a list?

Answer 1

There's a more elegant solution: class_copyProtocolList() directly returns the adopted protocols of a class. Usage:

Class cls = [self class]; // or [NSArray class], etc.
unsigned count;
Protocol **pl = class_copyProtocolList(cls, &count);

for (unsigned i = 0; i < count; i++) {
    NSLog(@"Class %@ implements protocol <%s>", cls, protocol_getName(pl[i]));
}

free(pl);