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Generator QR in Objective-C iOS SDK Programming: A Beginner s Guide

iOS SDK Programming: A Beginner s Guide
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- (void)applicationWillTerminate:(UIApplication *)application { // Save data if appropriate } - (void)dealloc { [navController release]; [window release]; [super dealloc]; } @end 10 Switch back to MainWindowxib in Interface Builder Right-click ThreeViewNavContApp
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Delegate in the document window and connect the navController outlet to the UINavigationController (Figure 9-5)
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11 Save your changes and click Run to run the application, and FirstViewController s view
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should appear (Figure 9-6)
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Figure 9-5
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Connecting the navigation controller
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UINavigationBar and UINavigationController
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Figure 9-6
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The application running in iPhone Simulator
The first step to using a navigation bar is to add a navigation controller to a document window Upon adding the navigation controller, Interface Builder also adds a root view controller, and you changed this view controller to your view controller Making this connection in Interface Builder allows the nib to manage the property s life cycle When you build and run the application, the application knows MainWindowxib is the application s main nib and loads it Upon loading, the nib initializes the objects it manages, which includes the navigation controller property, navController The navigation controller loads its root view controller Because the root view controller has an associated navigation item, the navigation controller adds a navigation bar above the view with the navigation item s title Because MainWindow xib handles all the application s initialization, all you do in the application:didFinishLaunchingWithOptions method is add the view to the window After adding the navigation controller, you must provide navigation controls so that a user can move from view to view You can either add a button to the navigation bar itself or add a control to a view s canvas The next few steps do both
12 Open MainWindowxib and select the navigation item in the document window (Figure 9-7)
Change the navigation item s title to First View
(continued)
iOS SDK Programming: A Beginner s Guide
Figure 9-7
Selecting the navigation item in the Document window
13 Drag a bar button item from the library to the navigation bar and Interface Builder will
highlight a rectangle where you can drop the button (Figure 9-8) Rename the button Next
14 Save your changes and then open FirstViewControllerh and add a new action
called moveToNextView (Listing 9-3) Import SecondViewController and add SecondViewController as a property Listing 9-3 FirstViewControllerh
#import <UIKit/UIKith> @class SecondViewController; @interface FirstViewController : UIViewController { SecondViewController * second; } @property (nonatomic, retain) SecondViewController * second; -(IBAction) moveToNextView: (id) sender; @end
9:
UINavigationBar and UINavigationController
Figure 9-8
Adding a button to FirstViewController s navigation bar
15 Open FirstViewControllerm and implement moveToNextView, as in Listing 9-4
Listing 9-4
FirstViewControllerm
#import "FirstViewControllerh" #import "SecondViewControllerh" @implementation FirstViewController @synthesize second;
(continued)
iOS SDK Programming: A Beginner s Guide
-(IBAction) moveToNextView: (id) sender { selfsecond = [[[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil] autorelease]; [selfnavigationController pushViewController:selfsecond animated: YES]; } -(void)dealloc { [second release]; [super dealloc]; } @end
16 Save your changes 17 Open MainWindowxib in Interface Builder, select the FirstViewController, and connect its
moveToNextView action to the Next button (Figure 9-9)
18 Save and click Run to run the application Tapping the Next button results in the second
Figure 9-9
Connecting moveToNextView action to the navigation button
9:
UINavigationBar and UINavigationController
Figure 9-10
The application running in iPhone Simulator
view being displayed (Figure 9-10) Tap First View, and the application returns to the first view
In Step 13, you changed the default title to your view s title Actually, to be specific, you changed the default title to your view controller s navigation item s title In Step 14, you added a bar button item to the navigation bar and set it as the navigation bar item s rightBarButtonItem Establishing this connection ensures the application displays the button on the bar s right You then created an action that, when clicked, pushes the second view controller onto the navigation controller s stack The navigation controller displays this view and a navigation bar containing the new view s navigation bar element Notice you must push view controllers onto the stack manually through code, as in Listing 9-4
[selfnavigationController pushViewController:selfsecond animated: YES];
iOS SDK Programming: A Beginner s Guide
If a view controller is in a navigation controller s stack, then the navigationController property automatically refers to the navigation controller managing the stack So, the navigation controller in ThreeViewNavContAppDelegate pushes FirstViewController s SecondViewController onto the stack Note that setting the animated parameter to YES causes the new view to slide in from the right or the old view from the left when navigating back As the task illustrates, creating an application using a navigation controller and associated navigation bar is not difficult The Back button, and popping a view controller from the navigation controller, is implemented for you You provide the control and action to push view controllers onto the navigation controller s stack
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