Using Navigation Controllers
Push/pop navigation is one of the common types of navigation in iPhone apps, and it is easy to set up. A navigation controller manages a stack of view controllers. It is always initialized with a view controller and view controllers can be pushed onto the stack or removed from the stack.
Follow the steps below to set up a navigation controller.
To create the navigation controller in the image above, create a UINavigationController in the application delegate and set it to be the rootViewController of the window.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Create the first view controller
FirstViewController *vc = [[FirstViewController alloc] init];
// Create the navigation controller
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:vc];
self.window.rootViewController = navigationController;
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
In the event handler for a button or tapping a row in a table view, push a view controller.
- (IBAction)onTap:(id)sender {
SecondViewController *vc = [[SecondViewController alloc] init];
[self.navigationController pushViewController:vc animated:YES];
}
You get the back button automatically and tapping on the back button with remove the current view controller and go back to the previous view controller. If you want to remove the view controller manually, use the popViewControllerAnimated: method as below.
[self.navigationController popViewControllerAnimated:YES];
Below are some other common tasks that you might do with a navigation controller or its view controllers.