iOS中Category方法同名原类方法，如何调用原类方法？

iOS中Category方法调用Category方法，调用不到原类方法，如何调用原类方法

#pragma clang diagnostic push

#pragma clang diagnostic ignored "-Wobjc-protocol-method-implementation"

- (void)beginRefresh

{

    u_intcount =0;

    MethodcurrentMethod =nil;

    Method*methods =class_copyMethodList(self.class, &count);

    for(inti=count-1; i>0; i--) {

        if(method_getName(methods[i]) ==_cmd) {

            currentMethod = methods[i];

            break;

        }

    }

    ((void(*)(id,SEL))method_getImplementation(currentMethod))(self,method_getName(currentMethod));

}

#pragma clang diagnostic pop