gistfile1.m

#import "ViewController.h"

@interface ViewController () <UITableViewDelegate, UITableViewDataSource>
@property (weak, nonatomic) IBOutlet UITableView *tableView;
@property (weak, nonatomic) IBOutlet UISegmentedControl *segmentedControl;

@property (strong, nonatomic) NSArray *first;
@property (strong, nonatomic) NSArray *second;

@end

@implementation ViewController
@synthesize tableView = _tableView;
@synthesize segmentedControl = _segmentedControl;

@synthesize first = _first;
@synthesize second = _second;

- (NSArray *)first {
  if (!_first) {
    _first = [NSArray arrayWithObjects:@"One", @"Two", @"Three", nil];
  }
  
  return _first;
}

-(NSArray *)second {
  if (!_second) {
    _second = [NSArray arrayWithObjects:@"A", @"B", @"C", nil];
  }
  
  return _second;
}

- (void)viewDidLoad
{
  [super viewDidLoad];
  self.tableView.delegate = self;
  self.tableView.dataSource = self;

}

- (void)viewDidUnload
{
  [self setTableView:nil];
  [self setSegmentedControl:nil];
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

- (IBAction)valueChanged:(UISegmentedControl *)sender {
  NSLog(@"%i", sender.selectedSegmentIndex);
  [self.tableView reloadData];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
  return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
  return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
  if (self.segmentedControl.selectedSegmentIndex == 0) {
    return [self.first count];
  } else {
    return [self.second count];
  }
  
  return 0;
}

- (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];
  }
  
  if (self.segmentedControl.selectedSegmentIndex == 0) {
    cell.textLabel.text = [self.first objectAtIndex:indexPath.row];
  }
  
  if (self.segmentedControl.selectedSegmentIndex == 1) {
    cell.textLabel.text = [self.second objectAtIndex:indexPath.row];
  }
  
  return cell;
}

@end