Step 1
Click on the project's icon.
![Click-on-project-in-iPhone.png]()
Step 2
Right-click on it and add New File.
![Select-new-file-in-iPhone.png]()
Step 3
Now select User interface and select "Window" then click "Next".
![Select-window-in-iPhone.png]()
Step 4
Now select the "iPhone" Device Family.
![Select-device-family-in-iPhone.png]()
Step 5
Now save it with the new name MainWindow and click on Create.
![save-as-mainwindow.xib-in-iPhone.png]()
Step 6
Now MainWindow.Xib add in the project file folder:
![select-info.plist-in-iPhone.png]()
Now we click on CalendarApp info.plist file to add window in the project.
Step 7
Here select any info.plist file then ''+'' will be appear. Click on "+" icon then Select Main nib file base name from drop down menu.
![add-main-window-nib-in-iPhone.png]()
Step 8
Now enter MainWindow in the right-side column.
![write-main-window-in-iPhone.png]()
Step 9
Now here we see Mainwindow in the project.
![Main-nib-base-file-name-in-iPhone.png]()
It is useful for window based Project.