在 Swift-project 中使用 Cocoalumberjack

Question

我问这个问题是因为我在网上找到的所有答案要么已经过时，要么对我不起作用。

我正在使用一个客户框架，出于某种原因，他们要求我在项目中使用 CocoaLumberjack，所以对其他日志工具的任何建议对我来说都是无用的，至少对于这个项目，提前感谢您的理解

问题：

如何从用户那里获取日志？我对日志记录不太熟悉，所以这对我来说是全新的。

我在Github上的许多SO-answers和CocoaLumberjacks文档的帮助下编写了一些代码。

我很确定我实际上是在记录，因为当我在真实设备上运行我的应用程序时，我可以通过以下方式从 Xcode 获取日志：Xcode -> 窗口 -> 设备和模拟器 -> 选择设备(和应用程序)->下载容器。

从容器中，我可以看到日志。但是，如何查看来自用户在其设备上不在此处的日志？

应用代表.swift ：

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool  {
let formatter = LogFormatter()
DDTTYLogger.sharedInstance.logFormatter = formatter
return true
}

我的日志格式化程序来自StackOverflow https://stackoverflow.com/a/14000342/4189589

class LogFormatter: NSObject, DDLogFormatter {
let dateFormatter: DateFormatter
static let sharedInstance = LogFormatter()
override init() {
dateFormatter = DateFormatter()
dateFormatter.formatterBehavior = .behavior10_4
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss:SSS"
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)

DDLogDebug("Debug")
DDLogVerbose("Verbose")
DDLogInfo("Info")
DDLogWarn("Warn")
DDLogError("Error")

super.init()
}
func format(message logMessage: DDLogMessage) -> String? {
let dateAndTime = dateFormatter.string(from: logMessage.timestamp)
return "(dateAndTime) [(logMessage.fileName):(logMessage.line)]: (logMessage.message)"
}

var ddFileLogger: DDFileLogger!
var logFileDataArray: [NSData] {
get {
let logFilePaths = ddFileLogger.logFileManager.sortedLogFilePaths
var logFileDataArray = [NSData]()
for logFilePath in logFilePaths {
let fileURL = NSURL(fileURLWithPath: logFilePath)
if let logFileData = try? NSData(contentsOf: fileURL as URL, options: NSData.ReadingOptions.mappedIfSafe) {
// Insert at front to reverse the order, so that oldest logs appear first.
logFileDataArray.insert(logFileData, at: 0)
}
}
return logFileDataArray
}
}
}

然后我想用一个按钮通过电子邮件发送日志(来自同一个 SO-answer)

func emailLogsTo(email: String) {
if MFMailComposeViewController.canSendMail() {
let composeVC = MFMailComposeViewController()
composeVC.mailComposeDelegate = self
// Configure the fields of the interface.
composeVC.setToRecipients([email])
composeVC.setSubject("Feedback for app")
composeVC.setMessageBody("", isHTML: false)
let attachmentData = NSMutableData()
for logFileData in LogFormatter.sharedInstance.logFileDataArray {
attachmentData.append(logFileData as Data)
}
composeVC.addAttachmentData(attachmentData as Data, mimeType: "text/plain", fileName: "diagnostic.log")
self.present(composeVC, animated: true, completion: nil)
} else {
// Tell user about not able to send email directly.
}
}

当我调用函数发送电子邮件时发生的情况是，我收到"在隐式解开可选值包装时意外发现 nil"错误

let logFilePaths = ddFileLogger.logFileManager.sortedLogFilePaths

在 LogFormatter() 中

我做错了什么？

Answer 1

我恐怕只在 Obj-C 中拥有它：

NSMutableData *logData = [NSMutableData data];
for (NSData *logFileData2 in [self.utilities logfileData]) {
[logData appendData:logFileData2];
}
[picker addAttachmentData:logData mimeType:@"text/plain" fileName:@"logs.txt"];

然后在我的实用课上：

- (NSMutableArray *)logfileData {

NSUInteger maximumLogFilesToReturn = MIN(fileLogger.logFileManager.maximumNumberOfLogFiles, 10);
NSMutableArray *logFiles = [NSMutableArray arrayWithCapacity:maximumLogFilesToReturn];
DDFileLogger *logger = fileLogger;
NSArray *sortedLogFileInfos = [logger.logFileManager sortedLogFileInfos];
for (NSUInteger i = 0; i < MIN(sortedLogFileInfos.count, maximumLogFilesToReturn); i++) {
DDLogFileInfo *logFileInfo = [sortedLogFileInfos objectAtIndex:i];
NSData *fileData = [NSData dataWithContentsOfFile:logFileInfo.filePath];
[logFiles addObject:fileData];
}
return logFiles;
}

所以也许对你来说：

var logFileDataArray: [NSData] {
get {
let sortedLogFileInfos = ddFileLogger.logFileManager.sortedLogFileInfos
var logFileDataArray = [NSData]()
for logFileInfo in sortedLogFileInfos {
if let logFileData = try? NSData(contentsOf: logFileInfo.filePath as String, options: NSData.ReadingOptions.mappedIfSafe) {
// Insert at front to reverse the order, so that oldest logs appear first.
logFileDataArray.insert(logFileData, at: 0)
}
}
return logFileDataArray
}
}