Xcode variable coloring

Answer 1

Recompile. That seems to get it for me :)

Best I can tell, it updates its text analysis during compilation.

Answer 2

To do this for a single file I usually select all text, cut, and paste it (cmd-A, cmd-X, cmd-V).

Make sure you've saved the header file with the instance variable first.

Answer 3

Xcode is rather fail that way. I hope they fix this in Snow Leopard.