CocoaLumberjack is a fast & simple, yet powerful & flexible logging framework for macOS, iOS, tvOS and watchOS.
First, install CocoaLumberjack via CocoaPods, Carthage, Swift Package Manager or manually.
DDOSLogger for iOS 10 and later, or
DDASLLogger for earlier versions to begin logging messages.
platform :ios, '9.0' target 'SampleTarget' do use_frameworks! pod 'CocoaLumberjack/Swift' end
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.
For Objective-C use the following:
platform :ios, '9.0' target 'SampleTarget' do pod 'CocoaLumberjack' end
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
As of CocoaLumberjack 3.6.0, you can use the Swift Package Manager as integration method. If you want to use the Swift Package Manager as integration method, either use Xcode to add the package dependency or add the following dependency to your Package.swift:
.package(url: "https://github.com/CocoaLumberjack/CocoaLumberjack.git", from: "3.7.0"),
Note that you may need to add both products,
CocoaLumberjackSwift to your target since SPM sometimes fails to detect that
CocoaLumerjackSwift depends on
If you want to install CocoaLumberjack manually, read the manual installation guide for more information.
Usually, you can simply
import CocoaLumberjackSwift. If you installed CocoaLumberjack using CocoaPods, you need to use
import CocoaLumberjack instead.
DDLog.add(DDOSLogger.sharedInstance) // Uses os_log let fileLogger: DDFileLogger = DDFileLogger() // File Logger fileLogger.rollingFrequency = 60 * 60 * 24 // 24 hours fileLogger.logFileManager.maximumNumberOfLogFiles = 7 DDLog.add(fileLogger) ... DDLogVerbose("Verbose") DDLogDebug("Debug") DDLogInfo("Info") DDLogWarn("Warn") DDLogError("Error")
If you're using Lumberjack as a framework, you can
[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]; ... DDLogVerbose(@"Verbose"); DDLogDebug(@"Debug"); DDLogInfo(@"Info"); DDLogWarn(@"Warn"); DDLogError(@"Error");
When integrating Lumberjack into an existing Objective-C it is possible to run into
Multiple methods named 'tag' found with mismatched result, parameter type or attributes build error.
#define DD_LEGACY_MESSAGE_TAG 0 before importing CocoaLumberjack or add
#define DD_LEGACY_MESSAGE_TAG 0 or add
-DDD_LEGACY_MESSAGE_TAG=0 to Other C Flags/OTHER_CFLAGS in your Xcode project.
CocoaLumberjack also ships with a backend implementation for swift-log.
Simply add CocoaLumberjack as dependency to your SPM target (see above) and also add the
CocoaLumberjackSwiftLogBackend product as dependency to your target.
You can then use
DDLogHandler as backend for swift-log, which will forward all messages to CocoaLumberjack's
DDLog. You will still configure the loggers and log formatters you want via
DDLog, but writing log messages will be done using
Logger from swift-log.
In your own log formatters, you can make use of the
swiftLogInfo property on
DDLogMessage to retrieve the details of a message that is logged via swift-log.
To use swift-log with CocoaLumberjack, take a look the following code snippet to see how to get started.
// Import necessary packages import CocoaLumberjackSwift import CocoaLumberjackSwiftLogBackend import Logging // In your application's entry point (e.g. AppDelegate): DDLog.add(DDOSLogger.sharedInstance) // Configure loggers LoggingSystem.bootstrapWithCocoaLumberjack() // Use CocoaLumberjack as swift-log backend
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.
In most cases it is an order of magnitude faster than NSLog.
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.)
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.
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...
The current version of Lumberjack requires:
Per App privacy details on the App Store, Apple is requesting app developers to provide info about their data collection, us SDK maintainers must provide them with the same data.
By default, CocoaLumberjack does NOT collect any data on its own.
CocoaLumberjack is a logging framework which makes it easy to send those logs to different platforms.
This is why collecting data might happen quite easily, if app developers include any sensitive data into their log messages.
Important note: app developers are fully responsible for any sensitive data collected through our logging system!
In consequence, you must comply to the Apple's privacy details policy (mentioned above) and document the ways in which user data is being collected. Since the number of scenarios where data might be indirectly collected through CocoaLumberjack is quite large, it's up to you, as app developers, to properly review your app's code and identify those cases. What we can do to help is raise awareness about potential data collection through our framework.
Private data includes but isn't limited to:
DDLogInfo("User: \(myUser)") will add the
myUser info to the logs, so if those are forwarded to a 3rd party or sent via email, that may qualify as data collection.
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