Hi Bucky, Right off the bat my Xcode is rejecting the lines of code you show in video #4. For example, there is no brace at the end of the @parameters line, and attempting to add the code you suggest inside that line and the @end is rejected by the compiler. Same for everything after that. I'm running Xcode 6.2.
Are your videos not applicable to 6.2? Planning to make any new videos?
There were also differences in the icon method, but I figured that out. The rest of it I need instruction on.