follow these steps.
1)Create a tableViewController with xib.
2)Create only two other xib's as given screenshots below:--
3)Drag uitableView from object window.

4)Change its class to TableViewController's class you have firstly created.
5)Connect file owner's view delegate to tableView.
6) And use code as ------
- (void)viewDidLoad
{
MYViewController *FirstTableController=[[MYViewController alloc] initWithNibName:@"MYViewController" bundle:nil];
MYViewController *secondTableController=[[MYViewController alloc] initWithNibName:@"MYSecondController" bundle:nil];
MYViewController *thirdTableController=[[MYViewController alloc] initWithNibName:@"MYThird" bundle:nil];
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}

Or
#import <UIKit/UIKit.h>
@interface MYViewController : UITableViewController
{
IBOutlet UITableView *f_table,*s_table,*t_table; //outlets for different tableViews in xib.
}
@end

- (void)viewDidLoad
{
[super viewDidLoad];
self.view=f_table; // when working with first table.
self.view=s_table; //working with second table.
self.view=t_table; //working with third table.
}