Question

我正在使用这个CocoaLumberjack框架来记录Objective-C设计中的所有消息。现在我想将所有错误记录到一个文件，将所有其他消息记录到另一个文件。我知道我可以使用格式化程序来过滤这些信息。我在AppDelegate中创建了两个DDFileLogger实例，但是这两个记录器一直写入同一个文件。我想知道是否有一种方法可以指定日志目的地，以便两个记录器写入两个不同的文件。

Answer 1

实现这一目标的关键是使用自己的DDLogFileManager设置每个DDFileLogger，每个DDFFileManager都有单独的日志目录路径。 DDLogFileManager使用日志目录路径来确定要记录到哪个文件，因此如果您有两个指向同一目录，它们将记录到同一个日志文件。所以关键是为每个日志使用单独的目录。

对于两种不同的日志类型：“一个”和“两个”：

// Set the base log directory
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *baseDir = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
NSString *logsDirectory = [baseDir stringByAppendingPathComponent:@"Logs"];

// set up file logger One to log to subdirectory "One"
DDLogFileManagerDefault *fileManagerOne = [[DDLogFileManagerDefault alloc] initWithLogsDirectory:[logsDirectory stringByAppendingPathComponent:@"One"]];
DDFileLogger *loggerOne = [[DDFileLogger alloc] fileManagerOne];

// Use the filter formatter to make sure only "One" logs go to the "One" log files
ContextWhitelistFilterLogFormatter *formatterOne = [[ContextWhitelistFilterLogFormatter alloc] init];
[formatterOne addToWhitelist:LOG_CONTEXT_ONE];
[loggerOne formatterOne];

[DDLog loggerOne];

    // set up file logger Two to log to subdirectory "Two"
DDLogFileManagerDefault *fileManagerTwo = [[DDLogFileManagerDefault alloc] initWithLogsDirectory:[logsDirectory stringByAppendingPathComponent:@"Two"]];
DDFileLogger *loggerTwo = [[DDFileLogger alloc] fileManagerTwo];

// Use the filter formatter to make sure only "Two" logs go to the "Two" log files
ContextWhitelistFilterLogFormatter *formatterTwo = [[ContextWhitelistFilterLogFormatter alloc] init];
[formatterTwo addToWhitelist:LOG_CONTEXT_TWO];
[loggerTwo formatterTwo];

[DDLog loggerTwo];

然后你当然还需要定义宏来进行日志记录：

#define LOG_CONTEXT_ONE    1
#define LOG_CONTEXT_TWO    2

#define LogOne(frmt, ...) SYNC_LOG_OBJC_MACRO(0, 0, LOG_CONTEXT_ONE, frmt, ##__VA_ARGS__)
#define LogTwo(frmt, ...) SYNC_LOG_OBJC_MACRO(0, 0, LOG_CONTEXT_TWO, frmt, ##__VA_ARGS__)

这对我有用。

Answer 2

我没有足够的声誉评论上面的最佳答案，但这里是KabukiAdam的一个版本，与最新的CocoaLumberjack合作：

// Set the base log directory
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *baseDir = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
NSString *logsDirectory = [baseDir stringByAppendingPathComponent:@"Logs"];

// set up file logger One to log to subdirectory "One"
DDLogFileManagerDefault *fileManagerOne = [[DDLogFileManagerDefault alloc] initWithLogsDirectory:[logsDirectory stringByAppendingPathComponent:@"One"]];
DDFileLogger *loggerOne = [[DDFileLogger alloc] initWithLogFileManager:fileManagerOne];

// Use the filter formatter to make sure only "One" logs go to the "One" log files
ContextWhitelistFilterLogFormatter *formatterOne = [[ContextWhitelistFilterLogFormatter alloc] init];
[formatterOne addToWhitelist:LOG_CONTEXT_ONE];
[loggerOne setLogFormatter:formatterOne];
[DDLog addLogger:loggerOne];

// set up file logger One to log to subdirectory "Two"
DDLogFileManagerDefault *fileManagerTwo = [[DDLogFileManagerDefault alloc] initWithLogsDirectory:[logsDirectory stringByAppendingPathComponent:@"Two"]];
DDFileLogger *loggerTwo = [[DDFileLogger alloc] initWithLogFileManager:fileManagerTwo];

// Use the filter formatter to make sure only "Two" logs go to the "Two" log files    ContextWhitelistFilterLogFormatter *formatterTwo = [[ContextWhitelistFilterLogFormatter alloc] init];
[formatterTwo addToWhitelist:LOG_CONTEXT_TWO];
[loggerTwo setLogFormatter:formatterTwo];
[DDLog addLogger:loggerTwo];

Answer 3

您可以通过使用新功能（每个记录器的不同日志级别）来实现非常接近的功能。见https://github.com/robbiehanson/CocoaLumberjack/wiki/PerLoggerLogLevels。创建2个文件记录器（一个具有错误级别而另一个具有详细程度）将不完全如您所述，因为错误日志将进入两个文件。这够好吗？

CocoaLumberjack FileLogger记录到多个文件

3 个答案: