I know this must be a really dumb ass question to ask on here, but I believe in asking if I don't know, well how on earth are you expected to learn otherwise :-) Anyway, my question is, how to use NSLog to output responses to the debugger. For example, I wish to see how data is being addressed, formatted, etc... In the file BT_screen_menuSearch.m I am trying to see what if any values are passed to the function 'textFieldDidChange' also what values might be held in the variables menuItems, filteredMenuItems, displayMenuItems. Any help would be much appreciated.

No questions are dumb. NSLog is super duper useful. All it does is print something to the output console. But, like you're discovering, thats very very necessary sometimes. There are some formatting tricks to getting the output the way you need. In the simplest form, it's NSLog(@'print this to the screen'); The single quotes that show in this forum should be double quotes in Xcode. For more sophistated formatting, like numbers, dates, and other non-string values, do a quick Google Search. You'll end up with log statements that look like... Example...to print a number to the console: NSLog(@'my number is%d', 34); The 34 will be printed where the %d is. Weird I know but anything that's not a generic string message will need a format modifier or it won't print. Again...google's your friend.

Many thanks, so is %d a variable within your string output to which you are passing 34 or is it a formatting element to determine how 34 will be displayed in the debugger?

The %d is just a format modifier (fancy speak for a placeholder. NSLog(@'my number %d', 34) will output 'my number 34' NSLog(@'my first name is %@ and my last name is %@, 'david', 'book') outputs 'my first name is david and my last name is book' The type of modifier is determined by the type of data you want to output. Number, string, decimal, etc. Saw your email, I'll try to get a look tom. It's 3:30 AM here. Done.

Thanks, I get it now :) 12 noon here, I think you may need some sleep LOL :-)