Swift 2.0 で CocoaPods の CocoaLumberjack を組み込んで使ってみる ref: http://qiita.com/KazuyukiEguchi/items/79cb93a1bc7dc0b5b9bc

console

$ pod install

DDFileLogger.m

- (NSString *)defaultLogsDirectory {
#if TARGET_OS_IPHONE
    // NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *baseDir = paths.firstObject;
    NSString *logsDirectory = [baseDir stringByAppendingPathComponent:@"Logs"];

#else
    NSString *appName = [[NSProcessInfo processInfo] processName];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
    NSString *basePath = ([paths count] > 0) ? paths[0] : NSTemporaryDirectory();
    NSString *logsDirectory = [[basePath stringByAppendingPathComponent:@"Logs"] stringByAppendingPathComponent:appName];

#endif

    return logsDirectory;
}

PodFile

pod 'CocoaLumberjack/Swift',  
:git => ‘https://github.com/CocoaLumberjack/CocoaLumberjack.git', 
:branch => 'swift_2.0' 
use_frameworks!

Swift2

DDLogDebug("didUpdateToLocation")