Snippet on adding logging to the app using Lumberjack.

AppDelegate.m

//
//  Logging.h
//
#import <CocoaLumberjack/CocoaLumberjack.h>
//
//typedef NS_ENUM(NSUInteger, DDLogLevel) {
//    DDLogLevelOff       = 0,
//    DDLogLevelError     = (DDLogFlagError),                       // 0...00001
//    DDLogLevelWarning   = (DDLogLevelError   | DDLogFlagWarning), // 0...00011
//    DDLogLevelInfo      = (DDLogLevelWarning | DDLogFlagInfo),    // 0...00111
//    DDLogLevelDebug     = (DDLogLevelInfo    | DDLogFlagDebug),   // 0...01111
//    DDLogLevelVerbose   = (DDLogLevelDebug   | DDLogFlagVerbose), // 0...11111
//    DDLogLevelAll       = NSUIntegerMax                           // 1111....11111 (DDLogLevelVerbose plus any other flags)
//};



static const DDLogLevel ddLogLevel = DDLogLevelVerbose;

// redefine NSLog so we don't have to go change all NSLog calls to Lumberjack.

#define NSLog DDLogVerbose


//////////////////////////

#import "AppDelegate.h"
#import <CocoaLumberjack/CocoaLumberjack.h>

@interface AppDelegate ()

@end

@implementation AppDelegate


- (void)setupLogging{
    
    // configure lumberjack logging.
    [DDLog addLogger:[DDASLLogger sharedInstance]];  
    [DDLog addLogger:[DDTTYLogger sharedInstance]];
    
    DDFileLogger *fileLogger = [[DDFileLogger alloc] init];
    fileLogger.rollingFrequency = 60 * 60 * 24; // 24 hour rolling
    [fileLogger setMaximumFileSize:1024 * 1024 *2]; // 2mb file
    fileLogger.logFileManager.maximumNumberOfLogFiles = 7; // 7 days of logs.
    
    [DDLog addLogger:fileLogger];
    
    DDLogVerbose(@"Lumberjack Logging Setup");
}

- (void)setupUserDefaults{
    
    // configure our NSUserDefaults to use a plist file in our project.
    NSURL *defaultPrefsFile = [[NSBundle mainBundle]
                               URLForResource:@"DefaultUserSettings" withExtension:@"plist"];
    NSDictionary *defaultPrefs =[NSDictionary dictionaryWithContentsOfURL:defaultPrefsFile];
    [[NSUserDefaults standardUserDefaults] registerDefaults:defaultPrefs];
    
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    [self setupUserDefaults];
    
    [self setupLogging];

    return YES;
}