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pass NSMutableArray to UITableViewController
mytable.gettedBooks = newBooksArray; // gettedBooks is NSMutableArray in UITableViewController

mytable.try = @"Emyyyyy"; // try is a NSString in UITableViewController

NSLog(@"Try: %@", try); // out is null
NSLog(@"my getted array count: %d", [gettedBooks count]); // out is 0

@interface RootViewController : UIViewController <UITableViewDataSource, UITableViewDelegate>
{
    NSMutableArray         * feed;
    UITableView            * tableView;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [feed count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }

    cell.textLabel.text = [mutableArray objectAtIndex:indexPath.row];
    return cell;
}

UITableViewController *viewController = [[UITableViewController alloc] initWithNibName:@"TableXIB" bundle:nil];
[viewController setGettedBooks:newBooksArray];
[self.navigationController pushViewController:viewController animated:YES];

NSArray *viewControllers = [self.tabBarController viewControllers];
    MyTableViewController *mTable = [viewControllers objectAtIndex:0];

    [mTable SetArrayData:arrayFromViewController];

    [mTable.tableView reloadData];

NSArray *viewControllers = [self.navigationController viewControllers];
    MyTableViewController *mTable = [viewControllers objectAtIndex:0];

    [mTable SetArrayData:arrayFromViewController];

    [mTable.tableView reloadData];