Steps to Set the Storyboard as App’s Main Interface | iOS Programmer Guide

1. In the project navigator, select your project.
2. In the editor area of the workspace window, Xcode displays the project editor, which allows you to view and edit details about how your app is built.
3. Under Targets, select your app.
4. Select the General tab.
5. Under Deployment Info, find the Main Interface option.
6. Select your storyboard, e.g.,Main.storyboard