TableView is delegated, populates but wont group - objective-c

Question

I am having a weird problem and i couldn`t find a solution (or something similar).
The thing is, my UITableView Populates with initial info (for testing), but no matter what i do i can't seem to put it to grouped style (i can select it on the UI but it wont show)
I initially started a TabBar project and added a third navigationController view in the tabs.
#import <UIKit/UIKit.h>
#interface RootViewController : UITableViewController <UITableViewDelegate, UITableViewDataSource> {
NSMutableArray *tableData;
}
#property (nonatomic, retain) NSMutableArray *tableData;
-(void)initTableData;
#end
This is the header, and as you can see it has nothing out of the ordinary. The following code is inside the .m file of the header i just posted(ill only be posting uncommented code:
#synthesize tableData;
-(void)initTableData
{
tableData = [[NSMutableArray alloc] init];
[tableData addObject:#"Cidade"];
[tableData addObject:#"Veículo"];
[tableData addObject:#"Ano"];
[tableData addObject:#"Valor"];
[tableData addObject:#"Cor"];
[tableData addObject:#"Combustível"];
}
- (void)viewDidLoad {
[super viewDidLoad];
self.title = #"Busca";
UIBarButtonItem *_backButton = [[UIBarButtonItem alloc] initWithTitle:#"Back" style:UIBarButtonItemStyleDone target:nil action:nil];
self.navigationItem.backBarButtonItem = _backButton;
[self initTableData];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return 6;
}
// Customize the appearance of table view cells.
- (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];
}
// Configure the cell...
cell.textLabel.text = [tableData objectAtIndex:[indexPath row]];
return cell;
}
- (void)dealloc {
[tableData release];
[super dealloc];
}
Nothing out of the ordinary again as you can see...
Any idea of what may be causing this? I tried
- (id)initWithStyle:(UITableViewStyle)style {
// Override initWithStyle: if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
self = [super initWithStyle:UITableViewStyleGrouped];
if (self) {
// Custom initialization.
}
return self;
}
because i don't know what else to do. (also didn't worked)
Again, i got the delegate and datasource set to File`s Owner.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
// Set the tab bar controller as the window's root view controller and display.
self.window.rootViewController = self.tabBarController;
RootViewController *rvc = [[RootViewController alloc] initWithStyle: UITableViewStyleGrouped];
[self.window makeKeyAndVisible];
return YES;
}

Answer 1

As you have modified the - (id)initWithStyle:(UITableViewStyle)style initializer to return a UITableView with a grouped style, do you call this initializer when you initialize the RootViewController?
RootViewController *rvc = [[RootViewController] alloc] initWithStyle: UITableViewStyleGrouped];

Answer 2

Grouped tables respond to the sections. You only have 1 section listed so you will only see the 1 group. Try and add a 2nd tableData for the 2nd group and return 2 sections. You will also have to split the data in your -cellForRowAtIndexPath by section as well to make sure the data goes to the right section.
if (indexpath.section == 0) {
// first section and first tableData
}
if (indexpath.section == 1) {
// second section and second tableData
}