Question

my first application that was just for the iPhone I decided to also implement the ability to be used on the iPad and the first thing I wanted to choose the view to use if it were in the opening of an iPhone or iPad, in my delegate I wrote :

NSString *devy = [[UIDevice currentDevice]model];
if ([devy isEqualToString:@"iPad"]) {
    [window addSubview:viewController.viewCpuIpad];
    [window makeKeyAndVisible]; 
} else {
    [window addSubview:viewController.view];
    [window makeKeyAndVisible];    
}

When the iPhone’s okay, but when I open it on the iPad only displays a blank screen …. where wrong?

thanks

Answer 1

Apple’s recommended way (taken from Xcode’s universal application project template) is:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
        self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController_iPhone" bundle:nil] autorelease];
    } else {
        self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController_iPad" bundle:nil] autorelease];
    }
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

If you don’t want to use IB, you can create your view in view controller’s loadView method like:

- (void)loadView
{
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
        self.view = // create view for iPad.
    } else {
        self.view = // create view for iPhone.
    }
}

(UI_USER_INTERFACE_IDIOM() is a macro to support iOS 3.1 and earlier.)