objective c - resolveInstanceMethod with unknown number of arguments -

context:

i have dependency injection container - www.typhoonframework.org

it allows using interface defining components resolve them @ runtime - using resolveinstancemethod , implentationwithblock trampoline request di container.

users have been asking parameters provided @ runtime. example:

[assembly dangerousenemywithweapon:id<biggun>] 

. . enemy assembled collaborating classes in di container, gun provided @ runtime. . .

the question:

is possible use resolveinstancemethod define implementation number of arguments not known front?

i package these arguments, , forward them on responder.

the arguments packed in order or added dictionary matching selector part key.

you can't use +resolveinstancemethod: that, can use traditional forwarding. +resolveinstancemethod: installs new instance method on class using objective-c runtime. don't affect how called. called other method arguments in registers , on stack caller supplied them. don't opportunity package or marshal arguments.

if implement -forwardinvocation: , -methodsignatureforselector:, nsinvocation object. that's packaging of arguments (and return value). can use or interrogate unpack arguments , repack them how want.