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3 Open both newly created nibs and change the background color for each view 4 Open MainWindowxib and add a UITabBarController to the document 5 Delete the first tab bar view controller Drag a navigation controller to the document and
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drop it so it is the first item below the tab bar (Figure 9-19)
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6 Change the navigation controller s root view controller to FirstTabViewController by
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changing its class and nib name in the Inspector The canvas should indicate the view is from FirstTabViewControllernib (Figure 9-20)
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7 Change the navigation item s title from Root View Controller to step one 8 Drag a bar button item from the library to the navigation item in the Document window
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(Figure 9-21) Change the button s title to Next The button should automatically be set as the navigation item s rightBarButtonItem If not, connect the navigation item s rightBarButton outlet to the newly added bar button item
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9 Save and exit Interface Builder
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iPhone SDK Programming: A Beginner s Guide
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Figure 9-19 Adding a navigation controller
Figure 9-20 Canvas indicates view is from a different nib
9:
UINavigationBar and UINavigationController
Figure 9-21 Bar button added to document window
10 Open NavInTabAppDelegateh and NavInTabAppDelatem and adopt the UITabBarController
Delegate protocol Also add a UITabBarController property and a UINavigationController property Modify applicationDidFinishLaunching so it loads the tabBarController property s root view The files should match Listings 9-11 and 9-12 Save and build Listing 9-11 NavInTabAppDelegateh
#import<UIKit/UIKith> @interface NavInTabAppDelegate : NSObject<UIApplicationDelegate, UITabBarControllerDelegate> { UIWindow *window; UITabBarController *tabBarController; UINavigationController *navBarController; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet UITabBarController *tabBarController; @property (nonatomic, retain) IBOutlet UINavigationController * navBarController; @end
(continued)
iPhone SDK Programming: A Beginner s Guide
Listing 9-12
NavInTabAppDelegatem
#import "NavInTabAppDelegateh" @implementation NavInTabAppDelegate @synthesize window; @synthesize tabBarController; @synthesize navBarController; - (void)applicationDidFinishLaunching:(UIApplication *)application { [window addSubview:tabBarControllerview]; [window makeKeyAndVisible]; } - (void)dealloc { [window release]; [tabBarController release]; [navBarController release]; [super dealloc]; } @end 11 Open MainWindowxib in Interface Builder and connect the NavInTabAppDelegate s
navBarController to the newly added navigation controller (Figure 9-22) Connect the tabBarController to the newly added tab bar controller
12 Save and exit Interface Builder 13 Open StepTwoViewControllerh and implement the viewDidLoad method so that it sets the
navigationItem s title to step two (Listing 9-13)
Figure 9-22 Connecting the navBarController
9:
UINavigationBar and UINavigationController
Listing 9-13
SecondViewController sviewDidLoad method
- (void)viewDidLoad { [super viewDidLoad]; selfnavigationItemtitle = @"step two"; }
14 Open FirstTabViewControllerh and import StepTwoViewControllerh and
NavInTabAppDelegateh Also add the method signature, takeNextStep (Listing 9-14) Listing 9-14 FirstTabViewControllerh
#import<UIKit/UIKith> #import "StepTwoViewControllerh" #import "NavInTabAppDelegateh" @interface FirstTabViewController : UIViewController { } - (IBAction) takeNextStep: (id) sender; @end
15 Open FirstTabViewControllerm and implement the newly added action The file should
match Listing 9-15 Listing 9-15 FirstTabViewControllerm
#import "FirstTabViewControllerh" @implementation FirstTabViewController - (IBAction) takeNextStep : (id) sender{ StepTwoViewController *varSecondViewController = [[StepTwoViewController alloc] initWithNibName:@"StepTwoViewController" bundle:nil]; [selfnavigationController pushViewController:varSecondViewController animated: YES]; } - (void)dealloc { [super dealloc]; } @end
16 Open MainWindowxib and connect the bar button item to the FirstViewController s
takeNextStep method
17 Save and exit Interface Builder 18 Build and run the application in the iPhone Simulator You should have a two-tab
application, where the first tab has an embedded navigation control (Figure 9-23)
(continued)
iPhone SDK Programming: A Beginner s Guide
Figure 9-23 The finished application in iPhone Simulator
Summary
Creating an application with a navigation bar is straightforward In the application s MainWindowxib, add a UINavigationController Set the navigation controller s root view controller, and create one or more other view controllers Then add code that pushes the view controllers onto the navigation controller s stack When a view controller is pushed onto the stack, it becomes the topmost view controller, and so the application displays the view controller s view Popping a view controller off the stack is provided by default if you do not make the navigation bar s Back button invisible If you do make the Back button invisible, or somehow disable the button, you must use one of the navigation controller s methods for popping view controllers In this chapter, you learned how to create an application containing a navigation controller with three views You then used a navigation controller to duplicate the Utility Application template s results Finally, you embedded a navigation controller within a tab in a tab bar But this chapter did omit the most common navigation controller use: a table combined with a navigation controller In the next chapter, after learning about tables, I correct this omission by presenting a navigation controller combined with a table controller After learning about this combination, you will have a good enough knowledge of view controllers that you should be able to tackle most iPhone application navigation strategies
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