UINavigationController Customization Tutorial

UINavigationController Customization Tutorial

In this tutorial I’ll go through various tasks that are usually performed with a navigation controller. Feel free to jump into a particular section if you’re looking for something specific, or leave a comment if you feel like something is missing.

Creating a UINavigationController programmatically

Creating a UINavigationController programmatically is trivial. Assuming that you’ve already created a class called RootViewController that subclasses UIViewController, you would use something like this, typically in your AppDelegate file:

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

     // rootViewController can't be an instance of UITabBarController
     // remember to include RootViewController in your class!
     RootViewController * rootViewController = [[RootViewController alloc] initWithNibName:@"RootViewController" bundle:nil];

     UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:rootViewController];

     [self.window addSubview:navigationController.view];

     // Don't bother releasing navigationController as it needs to be around all the time

     [self.window makeKeyAndVisible];

     return YES;
 }

Basically, we just create an instance of root controller and then we use it to create the navigation controller. Finally, we need to add the navigation controller’s view to the main window.

Adding a title to a navigation controller

Actually you don’t add a title directly to the navigation controller, instead you add it to the view controller that’s being displayed:

 - (void)viewDidLoad {
     [super viewDidLoad];

     self.title = @"My View Controller";
 }

Hiding the Navigation Bar

Either in your view controller or where you initiated your navigation controller:

 - (void)viewDidLoad {
     [super viewDidLoad];

     self.title = @"My View Controller";
     // hide the navigation bar
     // use setNavigationBarHidden:animated: if you need animation
     self.navigationController.navigationBarHidden = YES;
 }

Showing the navigation toolbar

Either in your view controller or where you initiated your navigation controller:

 - (void)viewDidLoad {
     [super viewDidLoad];

     self.title = @"My View Controller";
     // hide the navigation bar
     // use setToolbarHidden:animated: if you need animation
     self.navigationController.toolbarHidden = NO;
 }

Changing the Navigation Bar background color

Either in your view controller or where you initiated your navigation controller:

 - (void)viewDidLoad {
     [super viewDidLoad];

     self.title = @"My View Controller";

     self.navigationController.navigationBar.tintColor = [UIColor
         colorWithRed:102.0/255
         green:52.0/255
         blue:133.0/255
         alpha:1];
 }

Changing the Navigation Bar style

Default style is UIBarStyleDefault, but you can use UIBarStyleBlack and eventually set the translucent propriety toYES.

 - (void)viewDidLoad {
     [super viewDidLoad];

     self.title = @"My View Controller";

     self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
 }

 - (void)viewDidLoad {
     [super viewDidLoad];

     self.title = @"My View Controller";

     self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
     self.navigationController.navigationBar.translucent = YES;
 }

Using a Navigation Bar background image

To use a background image for you navigation bar, you need to subclass UINavigationBar and declare your own drawRect method. You can add this code on its own file or at the top of your application delegate (after the import declarations):

 @implementation UINavigationBar (UINavigationBarCategory)

 - (void)drawRect:(CGRect)rect
 {
     UIImage *image = [UIImage imageNamed:@"bg.png"];

     [image drawInRect:rect];
 }

 @end

Changing Navigation Bar back button text

Here’s how to change the text of the back button:

 - (void)viewDidLoad {
     [super viewDidLoad];

     self.title = @"My View Controller";

     self.navigationController.navigationBar.backItem.title = @"Custom";
 }

Adding items to the right of your Navigation Bar

In your view controller:

 - (void)viewDidLoad {
     [super viewDidLoad];

     self.title = @"My View Controller";

     UIBarButtonItem *item = [[UIBarButtonItem alloc]
                              initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
                              target:self
                              action:@selector(doSomething)];
     self.navigationItem.rightBarButtonItem = item;

     [item release];
 }

Adding items to the Navigation Toolbar

To add items to your toolbar:

 - (void)viewDidLoad {
     [super viewDidLoad];

     self.title = @"My View Controller";

     // Show toolbar
     self.navigationController.toolbarHidden = NO;

     UIBarButtonItem *item1 = [[UIBarButtonItem alloc]
                               initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
                               target:self
                               action:nil];

     UIBarButtonItem *item2 = [[UIBarButtonItem alloc]
                               initWithBarButtonSystemItem:UIBarButtonSystemItemEdit
                               target:self
                               action:nil];


     UIBarButtonItem *item3 = [[UIBarButtonItem alloc]
                               initWithBarButtonSystemItem:UIBarButtonSystemItemOrganize
                               target:self
                               action:nil];

     NSArray *items = [NSArray arrayWithObjects:item1, item2, item3, nil];

     self.toolbarItems = items;

     [item1 release];
     [item2 release];
     [item3 release];
 }

Note that the items are not properly aligned. To align them, use flexible space:

 - (void)viewDidLoad {
     [super viewDidLoad];

     self.title = @"My View Controller";

     // Show toolbar
     self.navigationController.toolbarHidden = NO;

     UIBarButtonItem *flexibleSpace = [[UIBarButtonItem alloc]
                                       initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
                                       target:nil
                                       action:nil];

     UIBarButtonItem *item1 = [[UIBarButtonItem alloc]
                               initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
                               target:self
                               action:nil];

     UIBarButtonItem *item2 = [[UIBarButtonItem alloc]
                               initWithBarButtonSystemItem:UIBarButtonSystemItemEdit
                               target:self
                               action:nil];


     UIBarButtonItem *item3 = [[UIBarButtonItem alloc]
                               initWithBarButtonSystemItem:UIBarButtonSystemItemOrganize
                               target:self
                               action:nil];

     NSArray *items = [NSArray arrayWithObjects:item1, flexibleSpace, item2, flexibleSpace, item3, nil];

     self.toolbarItems = items;

     [item1 release];
     [item2 release];
     [item3 release];
 }

Conclusion

Take a look at the UINavigationController documentation to find out more about it.

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