Navigationbar button not showing - iphone

Question

I have UINavigationController. Then i need to display navigationbar button. I used following code:
UINavigationController *nav=[[UINavigationController alloc] init];
[self.view addSubview:nav.view];
UIImage *info_iphone=[UIImage imageNamed:#"button.png"];
UIButton *infobtn=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 48, 30)];
[infobtn setBackgroundImage:info_iphone forState:UIControlStateNormal];
[infobtn addTarget:self action:#selector(show_info:) forControlEvents:UIControlEventTouchUpInside];
self.navigationItem.rightBarButtonItem=[[UIBarButtonItem alloc]initWithCustomView:infobtn];

Answer 1

Sample Code :
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.viewController = [[YourViewController alloc] initWithNibName:#"YourViewController" bundle:nil];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
self.window.rootViewController = navController;
[self.window makeKeyAndVisible];
return YES;
}
In YourViewController's -viewWillAppear :
UIImage *info_iphone=[UIImage imageNamed:#"button.png"];
UIButton *infobtn=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 48, 30)];
[infobtn setBackgroundImage:info_iphone forState:UIControlStateNormal];
[infobtn addTarget:self action:#selector(show_info:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithCustomView:infobtn];
self.navigationItem.rightBarButtonItem = rightButton;

Answer 2

I think that the problem here is with the navigation controller. You can't add it as a subview of the UIViewControllers view. I am using story boards and there you can embed your View Controllers with Navigation Controllers.
Here, your "nav" does not know that it should care about your navigationItem. Your view controller is not in his viewControllers list.

Answer 3

I don't think adding UINavigationController as subview will work for you.
Rather you can add UINavigationController as subview(or as rootviewcontroller) to UIWindow in your AppDelegate file in didFinishLaunchingWithOptions method as follow :
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
self.viewController = [[[SampleViewController alloc] initWithNibName:#"SampleViewController" bundle:nil] autorelease];
UINavigationController *nav=[[UINavigationController alloc]initWithRootViewController:self.viewController];
self.window.rootViewController = nav;
[self.window makeKeyAndVisible];
return YES;
}
Than in your SampleViewController's Viewdidload method add the BarButton as follow :
UIImage *info_iphone=[UIImage imageNamed:#"button.png"];
UIButton *infobtn=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 48, 30)];
[infobtn setBackgroundImage:info_iphone forState:UIControlStateNormal];
[infobtn addTarget:self action:#selector(show_info:) forControlEvents:UIControlEventTouchUpInside];
[self.navigationItem setRightBarButtonItem:[[UIBarButtonItem alloc]initWithCustomView:infobtn]];
Hopefully this will help you.. :)

Answer 4

use this bellow code...
UIImage *info_iphone=[UIImage imageNamed:#"button.png"];
UIButton *infobtn=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 48, 30)];
[infobtn setBackgroundImage:info_iphone forState:UIControlStateNormal];
[infobtn addTarget:self action:#selector(show_info:) forControlEvents:UIControlEventTouchUpInside];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:infobtn];
[infobtn release];
UPDATE :
use bellow code
UIBarButtonItem *btnSave = [[UIBarButtonItem alloc]init];
btnSave.target = self;
btnSave.action = #selector(btnSave_Clicked:);
btnSave.title = #"Save";
btnSave.style=UIBarButtonItemStyleDone;
self.navigationController.topViewController.navigationItem.rightBarButtonItem = btnSave;