Dynamically call delegate method by name in Objective-C

gistfile1.m

- (void)dispathCommand:(NSString *)command withParameters:(NSArray *)parameters
{
    SEL *selector = NSSelectorFromString([NSString stringWithFormat:[@"handle" stringByAppendingString:[command capitalizedString]]);

    if (![self.delegate repondsToSelector:selector]) {
       [self handleUnknownCommand:command withParameters:parameters];
       return;
    }

    NSMethodSignature *signature = [[self.delegate class] instanceMethodSignatureForSelector:selector];

    if (signature != nil) {
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
        [invocation setTarget:self.delegate];
        [invocation setSelector:selector];
        [invocation setArgument:&parameters atIndex:2];
        [invocation invoke];
    }
}