Step 1
Click on the project's icon.
Step 2
Right-click on it and add New File.
Step 3
Now select User interface and select "Window" then click "Next".
Step 4
Now select the "iPhone" Device Family.
Step 5
Now save it with the new name MainWindow and click on Create.
Step 6
Now MainWindow.Xib add in the project file folder:
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.
Step 8
Now enter MainWindow in the right-side column.
Step 9
Now here we see Mainwindow in the project.
It is useful for window based Project.