I installed xcode4 and in Organizer - Documentation I can see iOS 4.3 Library, Mac OS X 10.6 Library and Xcode 4.0 Developer Librar
Arguably simpler than any of these is to manually add the RSS feed for the documentation - at the bottom of the documentation download list is a +
/ -
set of controls. Click +
and paste in feed://developer.apple.com/rss/com.apple.adc.documentation.AppleiPhone4_3.atom
and it'll automatically select the right one and start downloading (and notify you of updates, though I doubt there will be any more)
open the link feed://developer.apple.com/rss/com.apple.adc.documentation.AppleiPhone4_3.atom find the properly file for your iOS after finishing download copy the xar file to path /Developer/Documentation/DocSets/ and unzip it "sudo xar -xf *.xar" and unzip *.docset "sudo chown -R -P devdocs"
For some reason the iOS 4.3 Library is downloaded later. When you are online go into Preferences for Xcode and select Documentation. You will see that library is likely disabled but ready to be downloaded. If that is the case there will be a "Get" button on the right side which you can use to start the download which may take a while.
Once it is downloaded you will be able to use that documentation library when you are offline.
I was trying to get the documentation offline but could not find the "get" button.So I had to go to Preferences->Downloads->Documentation->Check and install now and then the new libraries showed up.Its better to check the "Check for and install updates automatically"