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I have been using Xcode 4 for 2 weeks and I noticed that I don't get code completion macros for if-else and switch statements.
Like this article describes: http://macdevelopertips.com/xcode/xcode-code-completion-macros.html
I had it working in the beginning, but it suddenly stopped.
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Go to Xcode > Preferences > Text Editing again. Quit out of Xcode and then relaunch Xcode. Now go to Code completion and check 'Suggest completions while typing'. Try typing library function or enum and enjoy!
Xcode tip #9: Xcode has great code completion built right in, but sometimes as you scroll through the options you might find the names are too long to fit. Fortunately, you can just grab the edge of the autocomplete popup and drag it as wide as you want!
Press the escape key when auto-complete makes the first suggestion. This will display the list.
Have you tried deleting the project's derived data (which contains the project index used by Code Sense)?
To do so, open the organizer (Window -> Organizer), then the Projects tab. Select your project then hit the delete button next to the derived data path (to the right). Confirm and let it re-index your project.
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