gistfile1.m

//The magic method
-(id (^)(id,...)) getSelector:(SEL) aSelector forTarget:(id) target withFirstArgument:(id) firstArgument {
    
    id (^blockName)(id,...) = ^id(id values,...) {
        
        id cenas = firstArgument;
        
        SEL theSelector;
        NSMethodSignature *aSignature;
        NSInvocation *anInvocation;
        
        
        theSelector = aSelector;
        aSignature = [self methodSignatureForSelector:theSelector];
        
        anInvocation = [NSInvocation invocationWithMethodSignature:aSignature];
        [anInvocation setSelector:theSelector];
        [anInvocation setTarget:self];
        [anInvocation setArgument:&cenas atIndex:2];
        
        NSUInteger numberOfAgurments = [aSignature numberOfArguments];
        NSUInteger remainingArguments = numberOfAgurments-3;
        
        va_list args;
        va_start(args, values);
        int index = 3;
        id value = values;
        do
        {
            [anInvocation setArgument:&value atIndex:index++];
            remainingArguments--;
        }
        while( (value = va_arg(args,id)) && (remainingArguments>0) );
        
        va_end(args);
        
        [anInvocation invoke];
        id tempResult;
        [anInvocation getReturnValue:&tempResult];
        id result = tempResult;
        return result;
    };
    
    return blockName;
    
}


-(id) sumA:(NSNumber*) a WithB:(NSNumber*) b {
    return [NSNumber numberWithInt:([a intValue] + [b intValue])];
}

-(id) sumA:(NSNumber*) a WithB:(NSNumber*) b withC:(NSNumber*) c{
    return [NSNumber numberWithInt:([a intValue] + [b intValue] + [c intValue])];
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
   
    
    
    id (^blockName)(id,...) = [self getSelector:@selector(sumA:WithB:) forTarget:self withFirstArgument:@2];
    NSLog(@"%@",blockName(@3)); //Output: 5
    
    id (^blockName2)(id,...) = [self getSelector:@selector(sumA:WithB:withC:) forTarget:self withFirstArgument:@2];
    NSLog(@"%@",blockName2(@3,@4)); //Output: 9

    
    
    return YES;
}