> Am 08.05.2018 um 19:26 schrieb Andreas Höschler <ahoe...@smartsoft.de>:
>
>> Most likely it isn’t working for the same reason as that code wasn’t working
>> on GNUstep :-)
>> The runtime function will only check for methods defined by the protocol
>> directly not for inherited ones. That is why the GNUstep function has
>> „recursive“ in its name. It is checking in the ancestry of the protocol.
>
> My test code was
>
> @protocol TestProtocol
>
> - (void)doIt;
>
> @end
>
>
> Protocol *_protocol = @protocol(TestProtocol);
> SEL aSelector = @selector(doIt);
> struct objc_method_description _methodDescription =
> protocol_getMethodDescription(_protocol, aSelector, NO, YES);
> if (_methodDescription.name == NULL) _methodDescription =
> protocol_getMethodDescription(_protocol, aSelector, NO, NO);
> NSLog(@"_methodDescription.name %@",
> NSStringFromSelector(_methodDescription.name));
>
> Where is the ancestry here? Isn't "doIt" defined directly in this example?
Here is the GNUstep code for this function:
struct objc_method_description
GSProtocolGetMethodDescriptionRecursive(Protocol *aProtocol, SEL aSel, BOOL
isRequired, BOOL isInstance)
{
struct objc_method_description desc;
desc = protocol_getMethodDescription(aProtocol, aSel, isRequired, isInstance);
if (desc.name == NULL && desc.types == NULL)
{
Protocol **list;
unsigned int count;
list = protocol_copyProtocolList(aProtocol, &count);
if (list != NULL)
{
unsigned int i;
for (i = 0; i < count; i++)
{
desc = GSProtocolGetMethodDescriptionRecursive(list[i],
aSel, isRequired, isInstance);
if (desc.name != NULL || desc.types != NULL)
{
break;
}
}
free(list);
}
}
return desc;
}
As you can see, the difference must either be in the recursive call or in the
isRequired parameter. You could try to set that to YES for your direct call.
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