”;
A universal application is an application that is designed for both iPhone and iPad in a single binary. A universal application allows code reuse and fast updates.
Universal Application – Steps Involved
Step 1 − Create a simple View based application.
Step 2 − Change the File name ViewController.xib file to ViewController_iPhone.xib as shown below in the file inspector in the right hand side.
Step 3 − Select File → New → File… then select the subsection “User Interface” and select View. Click Next.
Step 4 − Select the device family as iPad and click next.
Step 5 − Save the file as ViewController_iPad.xib and select Create.
Step 6 − Add a label in the center of the screen in both ViewController_iPhone.xib and ViewController_iPad.xib.
Step 7 − In ViewController_iPad.xib, select the identity inspector and set the custom class as ViewController.
Step 8 − Update the application:DidFinishLaunching:withOptions method in AppDelegate.m as follows −
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; // Override point for customization after application launch. if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) { self.viewController = [[ViewController alloc] initWithNibName:@"ViewController_iPhone" bundle:nil]; } else { self.viewController = [[ViewController alloc] initWithNibName: @"ViewController_iPad" bundle:nil]; } self.window.rootViewController = self.viewController; [self.window makeKeyAndVisible]; return YES; }
Step 9 − Update the devices in project summary to Universal as shown below −
Output
When we run the application, we”ll get the following output −
When we run the application in iPad simulator, we”ll get the following output −
”;