Creating Photos album and uploading photos into the album. Two methods mentioned below creates album and uploads gallery pic on Facebook.

/*=========================================================
 // Here we request connectin for creating album on facebook..
 ==========================================================*/
NSMutableArray *image = [[NSMutableArray alloc]init];
 NSMutableDictionary* parameters = [NSMutableDictionary dictionary];
 [parameters setObject:@"Ashish EventsApp" forKey:@"name"];
 [parameters setObject:@"Don't underestimate power of a common man!!!" forKey:@"message"];
 [parameters setObject:image forKey:@"picture"];
 self.postParams =
 [[NSMutableDictionary alloc] initWithObjectsAndKeys:
 image, @"picture", nil];
 [FBRequestConnection startWithGraphPath:@"me/albums" parameters:parameters HTTPMethod:@"POST"
 completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
 FBGraphObject* temp = (FBGraphObject *)result;
 NSDictionary *dic=(NSDictionary*)temp;
 _strRequestId = [dic objectForKey:@"id"];

     if (error) {
         NSLog(@"%@", error.description);
     } else {
         NSLog(@"%@", result);
         _strRequestId = [dic objectForKey:@"id"];
         [self uploadImagesOnFB];
     }
 }];

/*=========================================================

Uploading Images to the album created from the above method.. ==========================================================*/

-(void)uploadImagesOnFB{
/*=========================================================
 In case of Uploading more than 1 Image in a album uncomment below code 
 ==========================================================*/
/*UIImage *img1 = [UIImage imageNamed:@"Tajmahal.jpg"];
UIImage *img2 = [UIImage imageNamed:@"2014.jpg"];
UIImage *img3 = [UIImage imageNamed:@"eiffel.jpg"];
image = [[NSMutableArray alloc]initWithObjects:img1,img2,img3, nil];
self.postParams = [[NSMutableDictionary alloc] initWithObjectsAndKeys:[image objectAtIndex:_i], @"picture",nil];*/

self.postParams = [[NSMutableDictionary alloc] initWithObjectsAndKeys:image, @"picture",nil];
[FBRequestConnection startWithGraphPath:[_strRequestId stringByAppendingString:@"/photos"]
                             parameters:self.postParams
                             HTTPMethod:@"POST"
                      completionHandler:^(FBRequestConnection *connection,
                                          id result,
                                          NSError *error)
 {
     NSString *alertText;
     if (error) {
         alertText = [NSString stringWithFormat:
                      @"error: domain = %@, code = %d",
                      error.domain, error.code];
     } else {
         alertText = [NSString stringWithFormat:
                      @"Posted action, id: %@",
                      [result objectForKey:@"id"]];
         /*if (&#95;i<+image.count) {
             _i++;
             [self uploadImagesOnFB];
         }*/
     }
     // Show the result in an alert
     [[[UIAlertView alloc] initWithTitle:@"Result"
                                 message:alertText
                                delegate:self
                       cancelButtonTitle:@"OK!"
                       otherButtonTitles:nil] show];
 }];

}

For more help see the attached code.

Happy Coding...!!!