I created “NotifyingClass.h and .m as instructed on page 38. In addition to the the newly created NotifyingClass.h and .m files, Groups and Files Pane>Classes window also contains TextAppAppDelegate.h and .m files. I do not see these files in figure 3.3 on page 41. Is everything OK for continuing?
Yes, everything is fine. That image is an old image from OS X Leopard and Xcode 3.1; I hadn’t updated a reference to a file when I refreshed the image for Xcode 3.2 and Snow Leopard. This has now been fixed for the next Beta.
Ignore the TextAppAppDelegate files; these are not created by earlier versions of Xcode, which is one of the reasons I don’t use them in the early chapters.