My App is targeted to 10.6 and the "Deployment" value for all .xib files was 10.6 apart from one, which recently changed to 10.7 (I don't know when). If I change it back to 10.6 I get the following warning from Xcode:
/Users/andy/Source/.../Preferences.xib:383: Identifier on OS X versions prior to 10.7
Here is the relevant part of the .xib file:
381: <string key="NSFrame">{{1, 1}, {116, 104}}</string>
382: <reference key="NSSuperview" ref="14642427"/>
383: <reference key="NSNextKeyView" ref="1001986100"/>
384: <string key="NSReuseIdentifierKey">_NS:11</string>
(In fact when I open the .xib in BBEdit in order to see the warning line and then close it and clean/build in Xcode, the line being warned seems to change; it's always 383 however the content moves. The last time the warning happened it was the NSSuperview line that was on line 383, which is weird to say the least).
Sometimes I get two warnings. The other warning is:
file://localhost/Users/andy/Source/.../Preferences.xib: warning: Attribute Unavailable: Identifier on OS X versions prior to 10.7
Which highlights a custom view in the .xib file when I click on it.
Can anyone tell me what this warning means and how I get rid of it?
I am developing under 10.8 using Xcode 4.4.1 and I reckon this warning will cause issues when running under 10.6 (something I cannot do during development). I am happy to provide additional info, as required.