Recently I upgraded my project settings in Xcode 4.3 and now I use the latest llvm debugger: lldb
However (sometimes) I have the impression the debugger is not giving me the correct info? Could this be possible?
For example, The debugger says _documentsItem is nil (both in in the console and when mouse-over-ing the ivar). But I know it's NOT, that is why I can see it (an UIBarButtonItem) and more important that is why the app stopped at the shown breakpoint)
if (_documentsItem) { ...
In fact most of my properties return nil too :( Is there a way I make sure the debugger is doing fine?
I've met similar issues in Xcode 4.3. And press "Option" while click "run" and changed it back to stable gdb.
It is definitely nil.
Look at the address that its been allocated. 0x00000 is nil.
This is a bug with XCode, which still hasn't been resolved, as of 4.3.2. Switch back to GDB, even if XCode complains about your project settings.
For view property value, use "po self.yourproperty"
来源：https://stackoverflow.com/questions/9408219/debugger-lldb-says-my-object-is-nil-when-is-not