These are the steps to create a custom UIViewControllers and .XIB files that take the place of the default MainWindow_iPhone.xib and MainWindow_iPad.xib in a Universal application.
Below is the architecture diagram. A custom HelloUniverseViewController will inherit from UIViewController. HelloUniverseViewController will not have a .XIB file. HelloUniverseViewController_iPhone and HelloUniverseViewController_iPad inherit from HelloUniverseViewController and have .XIB files. Functionality that is common between the two devices should be implemented in HelloUniverseViewController. Device-specific functionality should be implemented in the appropriate iPhone or iPad view controller.
1. Create a new Window-based Application.
– Device Family = Universal
2. In the HelloUniverse folder, add a new UIViewController subclass.
– UNCHECK “Targeted for iPad”
– UNCHECK “With XIB for user interface”
– Save As “HelloUniverseViewController”
3. Edit HelloUniverseAppDelegate.h. Add the bold lines below.
#import <UIKit/UIKit.h> @class HelloUniverseViewController; @interface HelloAppDelegate : NSObject <UIApplicationDelegate]]]]> @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet HelloUniverseViewController *viewController; @end
4. Edit HelloUniverseAppDelegate.m. Add the bold lines below.
#import "HelloUniverseViewController.h"
@synthesize window = _window;
@synthesize viewController = _viewController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
self.window.rootViewController = self.viewController;
[self.windowmakeKeyAndVisible];
return YES;
}
- (void)dealloc
{
[_window release];
[_viewController release];
[super dealloc];
}
iPhone
5. In the iPhone folder, add a new UIViewController subclass.
– Subclass of HelloUniverseViewController
– UNCHECK “Targeted for iPad”
– CHECK “With XIB for user interface”
– Save As “HelloUniverseViewController_iPhone”
6. In the iPhone folder, open MainWindow_iPhone.xib.
7. From the Objects list, drag a View Controller object onto the bar.
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8. Select newly added View Controller object.
9. Go to the Identity Inspector and change the Class to HelloUniverseViewController_iPhone.
10. Go to the Connections Inspector and add a New Referencing Outlet, viewController = App Delegate
11. Add a label to the HelloUniverseViewController_iPhone.xib: “Hello Universe iPhone”
iPAD
12. In the iPad folder, add a new UIViewController subclass.
– Subclass of HelloUniverseViewController
– CHECK “Targeted for iPad”
– CHECK “With XIB for user interface”
– Save As “HelloUniverseViewController_iPad”
13. In the iPad folder, open MainWindow_iPad.xib.
14. From the Objects list, drag a View Controller object onto the bar.
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15. Select newly added View Controller object.
16. Go to the Identity Inspector and change the Class to HelloUniverseViewController_iPad.
17. Go to the Connections Inspector and add a New Referencing Outlet, viewController = Hello Universe App Delegate i Pad
18. Add a label to the HelloUniverseViewController_iPhone.xib: “Hello Universe iPhone”
19. Save, Build and Run
Click here to download the sample XCode project. It targets iOS 4.3 for the iPhone and iPad.
Tags: ios, objective-c, xcode