NSLog and NSAssert substitution macros based on the ones from Marcus Zarra http://www.cimgf.com/2010/05/02/my-current-prefix-pch-file/ When the app runs on "Release" mode, assertions are linked to TestFlight checkpoints. I always name assertion type checkpoints with "ASSERTION" prefix. Example: Alog(@"ASSERTION_NON_PARSEABLE_ITEM_DATA_RECEIVED");

Dlog.h

#ifdef DEBUG
  #define DLog(...) NSLog(@"%s %@", __PRETTY_FUNCTION__, [NSString stringWithFormat:__VA_ARGS__])
  #define ALog(...) [[NSAssertionHandler currentHandler] handleFailureInFunction:[NSString stringWithCString:__PRETTY_FUNCTION__ encoding:NSUTF8StringEncoding] file:[NSString stringWithCString:__FILE__ encoding:NSUTF8StringEncoding] lineNumber:__LINE__ description:__VA_ARGS__]
#else
  #define DLog(...) do { } while (0)
  #define ALog(...) [TestFlight passCheckpoint:[NSString stringWithFormat:__VA_ARGS__]]
  #ifndef NS_BLOCK_ASSERTIONS
    #define NS_BLOCK_ASSERTIONS
  #endif
#endif

#define ZAssert(condition, ...) do { if (!(condition)) { ALog(__VA_ARGS__); }} while(0)

gracias por compartir !!!