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Summary:
My ios project has 400 objc file(.h/.m) and 120 swift file (.swift).

If I type objc defined class/method name from swift code, code-completion function show only swift defined class/method. But objc defined code is not show not at all.

I try to remove cache directiory:
rm -rf ~/Library/Developer/Xcode/DerivedData/
rm -rf ~/Library/Caches/com.apple.dt.Xcode/

After remove cache directory, code-completion function works fine temporary. But I re-build code only one (Cmd + B) , it breaks again. 

So I can not be helped, I go back to the Xcode 7.2.
it works fine.

I try to create new iOS project with some objc + swift file. if code size are small, this problem is not happen. Large size of code (like my project) break code completion function in Xcode7.3.

Steps to Reproduce:
1. Open objc/swift mixed iOS project using Xcode 7.3
2. Build code with cmd + b 
3. Open some swift code with Xcode editor.
4. Type some character of objc-defined class/method name.
5. Xcode code-completion function don't show code candidate.

Expected Results:
Xcode code-completion function show objc-defined and swift-defined class/method names.

Actual Results:
Xcode only show swift-defined class/method names.

Version:
Xcode 7.3
OS X El Capitan version 10.11.4