In Xcode 4.2 the MainWindow.xib is not included for some of the project templates. Its means now we have to generate GUI elements by code or we can reconstruct the MainWindow.xib in project. I am describing you the second option here.
If you create a new project in XCode 4.2, and choose the Empty Application template to start from, change nothing and try running it in your iPhone 5.0 simulator, you will see an empty – black – screen. The only thing you get from the template is an AppDelegate.h and AppDelegate.m.
We’ll now reconstruct the MainWindow.xib file in our project. So the next thing is now to create a empty user interface file. Choose iOS > User Interface > Empty as template. The name of this file is not very important but we’ll use MainWindow.xib because this name is familiar to us. (cont’d on sited source)
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