Adding UINavigation bar programmatically - ios

Question

I was trying to add the navigation bar to the application programmatically but I didn't got any success.
I had tried the code mentioned below
UIBarButtonItem *alefttbarButton = [[UIBarButtonItem alloc] initWithTitle:#"Setting" style:UIBarButtonItemStyleBordered target:self action:#selector(settingAction:)];
alefttbarButton.style = UIBarButtonItemStyleBordered;
alefttbarButton.tintColor= [UIColor redColor];
self.navigationItem.leftBarButtonItem=alefttbarButton;
self.navigationController.delegate=self;
self.title =#"test";

Answer 1

Here's how I did it. In this particular case I created my views all by hand. Starting in the applicationDidFinishLaunching, I have the following code:
UIWindow *window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
mainCtl = [[MainController alloc] init];
[window addSubview:mainCtl.nav.view];
[window makeKeyAndVisible];
As you can see I here allocate and initialize an instance of MainController, which is a subclass of UIViewController.
Then, in the initialization of this MainController I have a call to the navigation bar initialization code:
[self initNavBar];
which is the following function:
- (void) initNavBar
{
printf("initNavBar entered\n");
self.nav = [[UINavigationController alloc] initWithRootViewController: self];
//setup the middle view
int btnCount = 4;
CGRect buttonsFrame = CGRectMake(0, 0, btnCount*BUTTONWIDTH + (btnCount-1)*BUTTONSPACING + 2*BUTTONMARGIN, BUTTONHEIGHT + 2*BUTTONMARGIN);
UIView *buttonsView = [[UIView alloc] initWithFrame:buttonsFrame];
UIButton *button;
CGFloat left = BUTTONMARGIN;
// create button for photo selector invocation
button = [self buttonWithName:#"photo" target:self selector:#selector(showImagePicker) left:left];
//button = [self createButton:#"photo" action:#selector(showImagePicker) left:left];
[buttonsView addSubview:button];
left += (BUTTONWIDTH+BUTTONSPACING);
button = [self buttonWithName:#"crop" target:self selector:#selector(cropImage) left:left];
[buttonsView addSubview: button];
left += (BUTTONWIDTH+BUTTONSPACING);
kissButton = [self buttonWithName:#"kiss" target:self selector:#selector(cropImage) left:left];
[buttonsView addSubview: kissButton];
//left += (BUTTONWIDTH+BUTTONSPACING);
left += (BUTTONWIDTH+BUTTONSPACING);
button = [self buttonWithName:#"mail" target:self selector:#selector(showMailDialog) left:left];
//button = [self createButton:#"mail" action:#selector(showMailDialog) left:left];
[buttonsView addSubview:button];
Class mailClass = (NSClassFromString(#"MFMailComposeViewController"));
//only enable the mail button if the class exists
button.enabled = (mailClass != nil);
printf("initNavBar done\n");
}
This is all working code. If you can look through the cruft you'll manage to get the picture.
Hope this helps.