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A fast & simple, yet powerful & flexible logging framework for Mac and iOS
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Expose current log file info in `didLog` methods.
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Integration Use Xcode 10.2 and Swift 5.0 Apr 2, 2019
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Scripts Use functions for retrieving years Jan 31, 2019
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.gitattributes Added a StarUML diagram, exported as an image + into the Readme (set … Jun 1, 2016
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Build Status Pod Version Carthage compatible Pod Platform Pod License codecov codebeat badge

CocoaLumberjack is a fast & simple, yet powerful & flexible logging framework for Mac and iOS.

How to get started

  • install via CocoaPods
  • use DDOSLogger for iOS 10 and later, DDTTYLogger and DDASLLogger for earlier versions.
Swift version via CocoaPods
platform :ios, '8.0'

# You need to set target when you use CocoaPods 1.0.0 or later.
target 'SampleTarget' do
  pod 'CocoaLumberjack/Swift'

Note: Swift is a subspec which will include all the Obj-C code plus the Swift one, so this is sufficient. For more details about how to use Swift with Lumberjack, see this conversation.

Swift Usage

If you installed using CocoaPods or manually:

import CocoaLumberjackSwift
DDLog.add(DDOSLogger.sharedInstance) // Uses os_log

let fileLogger: DDFileLogger = DDFileLogger() // File Logger
fileLogger.rollingFrequency = 60 * 60 * 24 // 24 hours
fileLogger.logFileManager.maximumNumberOfLogFiles = 7


Obj-C version via CocoaPods
platform :ios, '8.0'
pod 'CocoaLumberjack'
Obj-C usage

If you're using Lumberjack as a framework, you can @import CocoaLumberjack;.

Otherwise, #import <CocoaLumberjack/CocoaLumberjack.h>

[DDLog addLogger:[DDOSLogger sharedInstance]]; // Uses os_log

DDFileLogger *fileLogger = [[DDFileLogger alloc] init]; // File Logger
fileLogger.rollingFrequency = 60 * 60 * 24; // 24 hour rolling
fileLogger.logFileManager.maximumNumberOfLogFiles = 7;
[DDLog addLogger:fileLogger];


Installation with Carthage (iOS 8+)

Carthage is a lightweight dependency manager for Swift and Objective-C. It leverages CocoaTouch modules and is less invasive than CocoaPods.

To install with Carthage, follow the instruction on Carthage


github "CocoaLumberjack/CocoaLumberjack"

CocoaLumberjack 3

Migrating to 3.x

  • To be determined


Lumberjack is Fast & Simple, yet Powerful & Flexible.

It is similar in concept to other popular logging frameworks such as log4j, yet is designed specifically for Objective-C, and takes advantage of features such as multi-threading, grand central dispatch (if available), lockless atomic operations, and the dynamic nature of the Objective-C runtime.

Lumberjack is Fast

In most cases it is an order of magnitude faster than NSLog.

Lumberjack is Simple

It takes as little as a single line of code to configure lumberjack when your application launches. Then simply replace your NSLog statements with DDLog statements and that's about it. (And the DDLog macros have the exact same format and syntax as NSLog, so it's super easy.)

Lumberjack is Powerful:

One log statement can be sent to multiple loggers, meaning you can log to a file and the console simultaneously. Want more? Create your own loggers (it's easy) and send your log statements over the network. Or to a database or distributed file system. The sky is the limit.

Lumberjack is Flexible:

Configure your logging however you want. Change log levels per file (perfect for debugging). Change log levels per logger (verbose console, but concise log file). Change log levels per xcode configuration (verbose debug, but concise release). Have your log statements compiled out of the release build. Customize the number of log levels for your application. Add your own fine-grained logging. Dynamically change log levels during runtime. Choose how & when you want your log files to be rolled. Upload your log files to a central server. Compress archived log files to save disk space...

This framework is for you if:

  • You're looking for a way to track down that impossible-to-reproduce bug that keeps popping up in the field.
  • You're frustrated with the super short console log on the iPhone.
  • You're looking to take your application to the next level in terms of support and stability.
  • You're looking for an enterprise level logging solution for your application (Mac or iPhone).



The current version of Lumberjack requires:

  • Xcode 10.2 or later
  • Swift 5.0 or later
  • iOS 8 or later
  • OS X 10.10 or later
  • WatchOS 3 or later
  • TVOS 9 or later

Backwards compatibility

  • for Xcode 10 and Swift 4.2, use the 3.5.2 version
  • for iOS 6, iOS 7, OS X 10.8, OS 10.9 and Xcode 9, use the 3.4.2 version
  • for iOS 5 and OS X 10.7, use the 3.3 version
  • for Xcode 8 and Swift 3, use the 3.2 version
  • for Xcode 7.3 and Swift 2.3, use the 2.4.0 version
  • for Xcode 7.3 and Swift 2.2, use the 2.3.0 version
  • for Xcode 7.2 and 7.1, use the 2.2.0 version
  • for Xcode 7.0 or earlier, use the 2.1.0 version
  • for Xcode 6 or earlier, use the 2.0.x version
  • for OS X < 10.7 support, use the 1.6.0 version


  • If you need help, use Stack Overflow. (Tag 'lumberjack')
  • If you'd like to ask a general question, use Stack Overflow.
  • If you found a bug, open an issue.
  • If you have a feature request, open an issue.
  • If you want to contribute, submit a pull request.


  • Robbie Hanson
  • Love the project? Wanna buy me a coffee? (or a beer :D) donation



  • CocoaLumberjack is available under the BSD 3 license. See the LICENSE file.



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