1. New a project from "Empty Application"
2. Update AppDelegate.h
- update "window" property as IBOutlet
3. Create AppWindow
- New a xib named "AppWindow.xib"
- Change the class of "File's Owner" to UIApplication
- Add an object to "Objects" and change its class to "App Delegate"
- Point "File's Owner" outlet named "delegate" to "App Delegate"
- Point "App Delegate" outlet named "window" to "Window"
4. Point "Main Interface" to AppWindow in target setting
5. Update AppDelegate.m
- remove code to alloc/init window
6. Create MainViewController
- New a class from UIViewController with xib named "MainViewController"
- Do something in the xib, say add a button
7. Update AppDelegate.m
- load MainViewController in AppDelegate
MainViewController *vc = [[MainViewController alloc...
[self.window setRootViewController:vc];
