How to configure iOS apps to not output NSLog in Release builds:

Simply define the following in your AppName-Prefix.pch file:

#ifdef DEBUG
#   define NSLog(...) NSLog(__VA_ARGS__)
#else 
#   define NSLog(...)
#endif

By the way, you can toggle DEBUG ON/OFF in “PROJECT > Build Settings > Apple LLVM compiler 4.2 - Preprocessing” as shown in the image below:

That’s all from the Gemba.

[Reference]

・objective c - Enable and Disable NSLog in DEBUG mode - Stack Overflow