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The DogBreeds application now runs full screen on the iPad, but it has a lot of wasted space In a typical navigation-based application, the larger display of the iPad is ideally suited to displaying navigation and item details at the same time When the iPad is in landscape orientation, a table view from the iPhone easily fits alongside a detail area that s still much larger than it is on the iPhone Apple calls this a split view, and iOS 32 on the iPad added the UISplitViewController to make it easy to implement a navigation view on the left that controls a detail view on the right When the iPad is in portrait orientation, there s not quite enough width to display a standard table view alongside a reasonably-sized detail area, so when in portrait orientation, the Split View Controller uses the full display for the detail view and pops up a navigation view on top of it when the user taps a button UISplitViewController automatically takes care of hiding the popover navigation view as you rotate the iPad
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iOS lets you define a second main window xib that will be used when the application is running on the iPad We start by creating that window and placing a Split View Controller in it instead of the Navigation Controller
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1 Open the DogBreeds project Control-click the project in the Navigation pane and select
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New Group, naming it Resources-iPad Drag the new folder down next to the Resources folder This will give us a convenient place to keep all of our iPad-specific resources
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2 Control-click the Resources-iPad folder and select New File | Select User Interface from
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the column on the left and Application as the template Select iPad from the Device Family pull-down (Figure 19-4) Name the new file MainWindow-iPad This creates a new xib file that is sized specifically for the iPad
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iOS SDK Programming: A Beginner s Guide
Figure 19-4
Creating a new window xib
3 Now we need to tell the application about the new MainWindow file Select DogBreeds-
Infoplist and add a new entry with key NSMainNibFile~ipad and the string value MainWindow-iPad
4 Select MainWindow-iPadxib Drag a Split View Controller into the main window 5 Select the View Controller on the left (under the Root View Controller title) In the
Identity subpane of the Utilities pane, change the class of this View Controller to RootViewController Select the right pane in the Split View Controller and change its class to BreedDetailViewController In the Attributes subpane, set each of them to load from their respective NIB files Save your changes
6 Go to DogBreedsAppDelegateh and define a new instance variable and IBOutlet property: UISplitViewController *splitVC; @property (nonatomic, retain) IBOutlet UISplitViewController *splitVC; 7 Synthesize the property in the m file and release it in the dealloc method 8 Switch back to MainWindow-iPadxib Select the App Delegate and set its class to
DogBreedsAppDelegate In the Connections subpane, connect the navigationController outlet to the Navigation Controller, the splitVC outlet to the Split View Controller, and the window outlet to the Window (Figure 19-5)
19:
Universal Applications for the iPad
Figure 19-5
Setting up the Split View Controller
9 Now when the application launches, we need to use the appropriate view based on whether
we re running on the iPhone or iPad Select DogBreedsAppDelegatem and change the application:didFinishLaunchingWithOptions method to match Listing 19-2 Listing 19-2 application:didFinishLaunchingWithOptions method
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { [window addSubview:[splitVC view]]; } else { [window addSubview:[navigationController view]]; } [window makeKeyAndVisible]; return YES; } 10 Save your changes and click Run If the iPad is in portrait orientation, rotate it to landscape
orientation You should see the dog groups navigation along the left and an empty details view on the right (Figure 19-6) If you stop the application and switch to running it in the iPhone Simulator, you ll find that everything still works as expected on the smaller iPhone screen
(continued)
iOS SDK Programming: A Beginner s Guide
Figure 19-6
DogBreeds with a split view
You will notice that clicking a group takes you to the breeds list as expected, but clicking a breed displays its details in the navigation pane rather than the details area This is because the two panes don t know anything about each other yet You will also notice that when you rotate the iPad Simulator to portrait orientation, the navigation view slides out of sight as expected However, there s no button to make the navigation appear as a popover Let s solve this problem first, and then we ll worry about connecting the detail pane to the navigation pane We will need to add a toolBar to the Breed Detail View in order to have some place to draw the button But the catch is that the iPhone version already has a navigation bar and we don t want to add an additional toolbar there Since we still want the rest of the behavior of the Breed Detail View, the easiest way to solve this will be to subclass BreedDetailViewController Adding this subclass will also give us the opportunity to change the layout of the photo and description in the nib file to make better use of the larger iPad display
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