CocoaLumberjack as a framework for iOS.

This project provides a way to integrate the CocoaLumberjack project easily into your own project, by providing a static library framework that you can add rather than adding the sources directly. It also provides a simple mechanism to use class-level logging, similar to what the venerable log4j provides in Java.

First to most easily integrate logging, add BRCocoaLumberjack.h to your PCH, something like this:

	#ifdef __OBJC__
		#import <UIKit/UIKit.h>
		#import <Foundation/Foundation.h>
		#import <BRCocoaLumberjack/BRCocoaLumberjack.h>
	#endif

Then you must configure the logging system, someplace early in the life of your application. How about in main():

	int main(int argc, char *argv[]) {
		@autoreleasepool {
	#ifdef LOGGING
			BRLoggingSetupDefaultLogging();
	#endif
			return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
		}
	}

Note the #ifdef LOGGING. Unless you define this macro, logging anything less that at the ERROR level will not be enabled. Add LOGGING=1 to your Preprocessor Macros build setting, probably just for the Debug configuration.

Then, when you want to log something in Objective-C, use the handy macros log4X or DDLogX, where Xis one of Error, Warn, Info, Debug, or Trace. For example:

	DDLogDebug(@"Hi there, from %@", NSStringFromClass([self class]));
	log4Debug(@"Hi again, from %@", NSStringFromClass([self class]));

Note that DDLogDebug and log4Debug produce the same results, they are just two different styles to accomplish the same thing, which is something like this:

DEBUG 08162039:19.307 c07    ViewController.m:23 viewWillAppear:| Hi there, ViewController

The world loves variety, and the DDLog style comes from CocoaLumberjack while the log4 comes from the log4cocoa project (and is more similar to log4j if you're coming from that world).

The logging output is by using the default formatter, which reads like this:

1. Log level - DEBUG
2. Timestamp - 08162039:19.307 which is MMddHHmm:ss.SSS format, as Aug 16 20:39:19.307
3. Thread - c07
4. File name and line number - ViewController.m:23
5. Method name - viewWillAppear:
6. Pipe - |
7. Message - Hi there, ViewController

The BRLoggingSetupDefaultLogging() function will configure INFO level logging by default. It will also look for a file named LocalEnvironment.plist in your application's main bundle, which should contain a dictionary with another dictionary on the key logging. The logging dictionary can contain the special key default to set the default logging level, to one of error, warn, info, debug, or trace.

In addition, class-level logging can be configured by adding more keys to the logging dictionary, named after the class you want to configure. Classes inherit the configured log level of their parent, too, which allows you to configure entire class hierarchies by setting a logging level at the root of the hierarchy.

For example, the following configures a default level of warn and the class AppDelegate (and any sub-classes) will use the debug level:

<plist version="1.0">
<dict>
	<key>logging</key>
	<dict>
		<key>default</key>
		<string>warn</string>
		<key>AppDelegate</key>
		<string>debug</string>
	</dict>
</dict>
</plist>

You can integrate BRCocoaLumberjack via CocoaPods, or manually as either a dependent project or static framework.

Install CocoaPods if not already available:

$ [sudo] gem install cocoapods
$ pod setup

Change to the directory of your Xcode project, and create a file named Podfile with contents similar to this:

platform :ios, '5.0' 
pod 'BRCocoaLumberjack', '~> 1.8.1'

Install into your project:

$ pod install

Open your project in Xcode using the .xcworkspace file CocoaPods generated.

Note that as BRCocoaLumberjack disables all but Error level logging unless a LOGGING=1 preprocessor macro is defined, other pods included in your app's project that also use BRCocoaLumberjack will not do any logging by default, because the generated Pods.xcodeproj will not have that macro defined. You can work around this by adding the following to your Podfile:

post_install do |installer|
	installer.pods_project.build_configurations.each do |config|
		if config.name == 'Debug'
			# for Debug, add LOGGING=1 macro to support BRCocoaLumberjack logging within pods themselves
			config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= ['$(inherited)', 'DEBUG=1']
			config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] |= ['LOGGING=1']
		end
	end
end

That will basically add LOGGING=1 to the Pod project's Debug configuration.

Using this approach you'll build a static library framework that you can manually integrate into your own project. After cloning the BRCocoaLumberjack repository, first initialize git submodules. For example:

git clone [email protected]:Blue-Rocket/BRCocoaLumberjack.git
cd BRCocoaLumberjack
git submodule update --init

This will pull in the relevant submodules, e.g. CocoaLumberjack.

The BRCocoaLumberjack Xcode project includes a target called BRCocoaLumberjack.framework that builds a static library framework. Build that target, which will produce a Framework/Release/BRCocoaLumberjack.framework bundle at the root project directory. Copy that framework into your project and add it as a build dependency.

Next, add -ObjC as an Other Linker Flags build setting.

Finally, you may need to add the path to the directory containing the BRFullTextSearch.framework bundle as a Framework Search Paths value in the Build Settings tab of the project settings. Xcode may do this for you, however.