iOS/iPhone Table View(UITableView) Sections from an NSArray/NSMutableArray/NSDictionary (Objective-C,iPhone, iPad)

    //Initialize the array.
    listOfItems = [[NSMutableArray alloc] init];
    
    // Section Group 1
    NSArray *arrGroup1 = [NSArray arrayWithObjects:@"Item 1", @"Item 2", @"Item 3", @"Item 4", nil];
    NSDictionary *dictGroup1 = [NSDictionary dictionaryWithObject:arrGroup1 forKey:@"GroupItem"];
    
    // Section Group 2
    NSArray *arrGroup2 = [NSArray arrayWithObjects:@"Item 5", @"Item 6", @"Item 7", @"Item 8", nil];
    NSDictionary *dictGroup2 = [NSDictionary dictionaryWithObject:arrGroup2 forKey:@"GroupItem"];
    
    [listOfItems addObject:dictGroup1];
    [listOfItems addObject:dictGroup2];

//
//  ViewController.h
//
//  Created by Weerachai on 11/3/55 BE.
//  Copyright (c) 2555 Weerachai. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@property (retain, nonatomic) IBOutlet UITableView *myTable;

@end

//
//  ViewController.m
//
//  Created by Weerachai on 11/3/55 BE.
//  Copyright (c) 2555 Weerachai. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()
{
    NSMutableArray *listOfItems;
}

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
    
    //Initialize the array.
    listOfItems = [[NSMutableArray alloc] init];
    
    // Section Group 1
    NSArray *arrGroup1 = [NSArray arrayWithObjects:@"Item 1", @"Item 2", @"Item 3", @"Item 4", nil];
    NSDictionary *dictGroup1 = [NSDictionary dictionaryWithObject:arrGroup1 forKey:@"GroupItem"];
    
    // Section Group 2
    NSArray *arrGroup2 = [NSArray arrayWithObjects:@"Item 5", @"Item 6", @"Item 7", @"Item 8", nil];
    NSDictionary *dictGroup2 = [NSDictionary dictionaryWithObject:arrGroup2 forKey:@"GroupItem"];
    
    [listOfItems addObject:dictGroup1];
    [listOfItems addObject:dictGroup2];
    
    //Set Title
    self.navigationItem.title = @"Group Option Item";
    
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    
    return [listOfItems count];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    
    NSDictionary *dictionary = [listOfItems objectAtIndex:section];
    NSArray *array = [dictionary objectForKey:@"GroupItem"];
    return [array count];
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    
    if(section == 0)
        return @"Group 1";
    else
        return @"Group 2";
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    
    static NSString *CellIdentifier = @"Cell";
    
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        // Use the default cell style.
        cell = [[[UITableViewCell alloc] initWithStyle : UITableViewCellStyleSubtitle
                                       reuseIdentifier : CellIdentifier] autorelease];
    }
    
    NSDictionary *dictionary = [listOfItems objectAtIndex:indexPath.section];
    NSArray *array = [dictionary objectForKey:@"GroupItem"];
    NSString *cellValue = [array objectAtIndex:indexPath.row];
    cell.textLabel.text = cellValue;
    
    return cell;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)dealloc {
    [_myTable release];
    [super dealloc];
}
@end