To convert your project to a universal app, see "Creating a Universal Application" in the iPad Programming Guide:
Configuring Your Xcode Project
The
first step to creating a universal
application is to configure your Xcode
project. If you are creating a new
project, you can create a universal
application using the Window-based
application template. If you are
updating an existing project, you can
use Xcode’s Upgrade Current Target for
iPad command to update your project:
- Open your Xcode project.
- In the Targets section, select the target you want to update to a
universal application.
- Select Project > Upgrade Current Target for iPad and follow the prompts
to create one universal application.
Xcode updates your project by
modifying several build settings to
support both iPhone and iPad.
Important: You should always use the Upgrade Current Target for iPad command to migrate existing projects. Do not try to migrate files manually.