I have see this in sample objective c code before, but can't find it now and all the searches come back with irrelivent results.
I want to write debug messages to the Xcode output window. What's the command to do that? Basically like System.Diagnostics.Debug.WriteLine for C#.
NSLog(@"Your message here");
...should do it.
To include data from variables you can use string formatting, e.g:
NSLog(@"Value of string is %@", myNSString);
There are a bunch of different string format specifiers, you can look at them here: https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Strings/Articles/formatSpecifiers.html