iOS - Universal Applications

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 toViewController_iPhone.xib as shown below in the file inspector in the right hand side.
iOS Tutorial
Step 3. Select File -> New -> File... then select the subsection "User Interface" and select View. Click Next.
iOS Tutorial
Step 4. Select the device family as iPad and click next.
iOS Tutorial
Step 5. Save the file as ViewController_iPad.xib and select Create.
Step 6. Add a label in the center of the screen in bothViewController_iPhone.xib and ViewController_iPad.xib.
Step 7. In ViewController_iPad.xib, select the identity inspector and set the custom class as ViewController.
iOS Tutorial
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 −
iOS Tutorial

Output

When we run the application, we'll get the following output −
iOS Tutorial
When we run the application in iPad simulator, we'll get the following output −
iOS Tutorial

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