// first, you need to import CocoaLumberjack files
#import "DDLog.h"
#import "DDTTYLogger.h"
#import "DDASLLogger.h"

// then, you could also add NXVLogFormatter whenever you need it 
#import "NXVLogFormatter.h"

// setup logger
- (void)initializeLogger
{
  // required, setup DDLog
  [DDLog addLogger:[DDASLLogger sharedInstance]];
  [DDLog addLogger:[DDTTYLogger sharedInstance]];

  // use NXVLogFormatter as custom log formmater
  [[DDTTYLogger sharedInstance] setLogFormatter:[NXVLogFormatter new]];

  // optional, enable colors
  [[DDTTYLogger sharedInstance] setColorsEnabled:YES];
}


// then in application:didFinishLaunchingWithOptions:, just bind 
// that log method to it
- (BOOL)              application:(UIApplication *)application
    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

  // initialize it
  [self initializeLogger];

  // ...

  return YES;
}