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iOS开发-Logger日志功能实现

在iOS开发中，常用CocoaLumberjack来作为日志功能实现的日志框架

一、CocoaLumberjack是什么？

CocoaLumberjack 是 支持 iOS 和 Mac 平台的日志框架，使用简单，功能强大且不失灵活，它的主要功能就是：支持不同 Level 的 Log 信息输出到各个渠道，包括苹果日志系统、Xcode 控制台、本地文件或者数据库。

二、简单实用CocoaLumberjack

在工程的Podfile文件中引入CocoaLumberjack与SSZipArchive

  pod 'SSZipArchive' # 压缩pod 'CocoaLumberjack'   # 日志库

CocoaLumberjack是通过DDLog的addLogger:(id )logger方法添加Log数据输出的渠道
有一下三种渠道

• DDTTYLogger(Xcode 控制台)
• DDASLLogger(苹果日志系统)
• DDFileLogger(本地文件)

示例代码如下

[DDLog addLogger:[DDTTYLogger sharedInstance]]; // TTY = Xcode console
[DDLog addLogger:[DDASLLogger sharedInstance]]; // ASL = Apple System LogsDDFileLogger *fileLogger = [[DDFileLogger alloc] init]; // File Logger
fileLogger.rollingFrequency = 60 * 60 * 24; // 24 hour rolling
fileLogger.logFileManager.maximumNumberOfLogFiles = 7;
[DDLog addLogger:fileLogger];

当然日志还需要我们区分Logger Level，CocoaLumberjack也为我们提供了相应的宏定义方法

如：

DDLogVerbose(@"Verbose"); // Log 信息
DDLogDebug(@"Debug");
DDLogInfo(@"Info");
DDLogWarn(@"Warn");
DDLogError(@"Error");

三、实现Logger输出文件及archive

有时候我们遇到应用出现问题，需要将一些关键点进行埋点，将关键信息保存到文件，带需要的时候将日志archive上传到服务器，以便分析出现的问题。

定义日志输出的格式代码

SDLogFormatter.h

#import <UIKit/UIKit.h>
#import "CocoaLumberjack.h"NS_ASSUME_NONNULL_BEGIN@interface SDLogFormatter : NSObject<DDLogFormatter>@endNS_ASSUME_NONNULL_END

SDLogFormatter.m

#import "SDLogFormatter.h"@implementation SDLogFormatter- (NSString *)formatLogMessage:(DDLogMessage *)logMessage{NSString *logLevel = nil;switch (logMessage.flag){case DDLogFlagError:logLevel = @"[ERROR] > ";break;case DDLogFlagWarning:logLevel = @"[WARN] > ";break;case DDLogFlagInfo:logLevel = @"[INFO] > ";break;case DDLogFlagDebug:logLevel = @"[DEBUG] > ";break;default:logLevel = @"[VBOSE] > ";break;}NSString *formatStr = [NSString stringWithFormat:@"[APP:%@ VERSION:%@] > [T:%@] > %@[%@ %@][line %lu] %@", [self appName], [self appVersion], [self currentDate],logLevel, logMessage.fileName, logMessage.function,(unsigned long)logMessage.line, logMessage.message];return formatStr;
}#pragma mark - App常用设置
- (NSString *)appName {return [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleDisplayName"];
}- (NSString *)appVersion {return [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];
}- (NSString *)currentDate {static NSDateFormatter *formatter = nil;static dispatch_once_t onceToken;dispatch_once(&onceToken, ^{formatter = [[NSDateFormatter alloc] init];formatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"];formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";});return [formatter stringFromDate:[NSDate date]];
}@end

实现日志本地输出log文件中及打包上传代码

SDLogger.h

#import <Foundation/Foundation.h>
#import "CocoaLumberjack.h"
#import "SDLogFormatter.h"
#import "SDLoggerDefine.h"
#import "SDSystemCatchCrash.h"@interface SDLogger : NSObject+ (instancetype)sharedInstance;/**初始化logger*/
- (void)initLogger;/**删除压缩上传后的zip目录@param zipPath zipPath目录*/
- (void)deleteZip:(NSString *)zipPath;/**获取zip地址，从那一天到哪一天的日志的zip@param fromDateString fromDateString 格式为“2022-01-19”@param toDateString toDateString  格式为“2022-01-19”*/
- (NSString *)getLogsZipPath:(NSString *)fromDateString toDate:(NSString *)toDateString;/**沙盒document目录@return document目录*/
- (NSString *)documentPath;/**沙盒cache目录@return cache目录*/
- (NSString *)cachePath;/**临时文件路径@return 临时文件路径*/
- (NSString *)dirTmpPath;/**创建目录文件路径@return 创建目录*/
- (NSString *)creatFolder:(NSString *)folderName at:(NSString *)dirPath;@end

SDLogger.m

/**CocoaLumberjack包含几个对象分别可以把Log输出到不同的地方：DDASLLogger 输出到Console.appDDTTYLogger 输出到Xcode控制台DDLogFileManager 输出到文件DDAbstractDatabaseLogger 输出到DB通过ddLogLevel的int型变量或常量来定义打印等级LOG_LEVEL_OFF 关闭LogLOG_LEVEL_ERROR 只打印Error级别的LogLOG_LEVEL_WARN 打印Error和Warning级别的LogLOG_LEVEL_INFO 打印Error、Warn、Info级别的LogLOG_LEVEL_DEBUG 打印Error、Warn、Info、Debug级别的LogLOG_LEVEL_VERBOSE 打印Error、Warn、Info、Debug、Verbose级别的Log使用不同的宏打印不同级别的LogDDLogError(frmt, …) 打印Error级别的LogDDLogWarn(frmt, …) 打印Warn级别的LogDDLogInfo(frmt, …) 打印Info级别的LogDDLogDebug(frmt, …) 打印Debug级别的LogDDLogVerbose(frmt, …) 打印Verbose级别的Log*/#import "SDLogger.h"
#import "SSZipArchive.h"
#import "SDSystemCatchCrash.h"static NSUncaughtExceptionHandler *previousUncaughtExceptionHandler;@interface SDLogger ()@property (nonatomic, strong) SDLogFormatter *logFormatter;@property (nonatomic, strong) DDFileLogger *fileLogger;@end@implementation SDLogger+ (instancetype)sharedInstance {static SDLogger *logger;static dispatch_once_t onceToken;dispatch_once(&onceToken, ^{logger = [[SDLogger alloc] init];logger.logFormatter = [[SDLogFormatter alloc] init];logger.fileLogger = [[DDFileLogger alloc] init];});return logger;
}/**初始化logger*/
- (void)initLogger {//新版本的OSlog,输出到到Consoleif (@available(iOS 10.0, *)) {[[DDOSLogger sharedInstance] setLogFormatter:self.logFormatter];[DDLog addLogger:[DDOSLogger sharedInstance] withLevel:DDLogLevelDebug];} else {//添加输出到Console[[DDASLLogger sharedInstance] setLogFormatter:self.logFormatter];[DDLog addLogger:[DDASLLogger sharedInstance] withLevel:DDLogLevelDebug];} // Uses os_log//添加文件输出self.fileLogger.rollingFrequency = 60 * 60 * 24; // 一个LogFile的有效期长，有效期内Log都会写入该LogFileself.fileLogger.logFileManager.maximumNumberOfLogFiles = 7;//最多LogFile的数量[self.fileLogger setLogFormatter:self.logFormatter];[DDLog addLogger:self.fileLogger withLevel:DDLogLevelInfo];//保存之前的HandlerpreviousUncaughtExceptionHandler = NSGetUncaughtExceptionHandler();// 将下面C函数的函数地址当做参数NSSetUncaughtExceptionHandler(&uncaughtExceptionHandler);
}/**删除压缩上传后的zip目录@param zipPath zipPath目录*/
- (void)deleteZip:(NSString *)zipPath {// 判断文件夹是否存在 不存在创建BOOL exits = [[NSFileManager defaultManager] fileExistsAtPath:zipPath];if (exits) {// 文件存在, 删除文件NSError *deError;[[NSFileManager defaultManager] removeItemAtPath:zipPath error:&deError];NSLog(@"deleteZipPath:%@", deError);}
}/**获取zip地址，从那一天到哪一天的日志的zip@param fromDateString fromDateString@param toDateString toDateString*/
- (NSString *)getLogsZipPath:(NSString *)fromDateString toDate:(NSString *)toDateString {if (!((fromDateString && [fromDateString isKindOfClass:[NSString class]] && fromDateString.length > 0) &&(toDateString && [toDateString isKindOfClass:[NSString class]] && toDateString.length > 0))) {return nil;}NSDate *fromDate = [[self dateFormatter] dateFromString:fromDateString];NSDate *toDate = [[self dateFormatter] dateFromString:toDateString];NSArray *dateList = [self getMonthArrayWithBeginDate:fromDate EndDate:toDate];NSLog(@"dateList:%@", dateList);// 根据日期，获取时间间隔from、to之间的log，将其存到tmp或者cache目录后中的tmpLog目录，将tmpLog目录压缩到tmp或者cache目录后的ziplog目录NSArray *logFilePaths = [self.fileLogger.logFileManager sortedLogFilePaths];NSArray *logFileNames = [self.fileLogger.logFileManager sortedLogFileNames];NSLog(@"logFilePaths:%@", logFilePaths);NSLog(@"logFileNames:%@", logFileNames);// 创建zip日志目录NSString *zipDir = [self creatFolder:@"logZips" at:[self cachePath]];// 创建tmpLog目录NSString *tmpLogDir = [self creatFolder:@"tmpLog" at:[self cachePath]];NSMutableArray *toFilePaths = [NSMutableArray arrayWithCapacity:0];for (NSString *day in dateList) {for (NSString *filePath in logFilePaths) {// filePathNSString *content = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];NSLog(@"content:%@", content);if ([filePath containsString:day]) {[toFilePaths addObject:filePath];}}}for (NSString *filePath in toFilePaths) {NSString *fileName = [filePath lastPathComponent];NSString *toFilePath = [tmpLogDir stringByAppendingPathComponent:fileName];// 判断文件夹是否存在 不存在创建BOOL exits = [[NSFileManager defaultManager] fileExistsAtPath:toFilePath];if (exits) {// 文件存在, 删除文件NSError *dError;[[NSFileManager defaultManager] removeItemAtPath:toFilePath error:&dError];NSLog(@"removeItemAtPath:%@", dError);}BOOL copyResult = [[NSFileManager defaultManager] copyItemAtPath:filePath toPath:toFilePath error:nil];NSLog(@"copyItemAtPath:%@", (copyResult?@"YES":@"NO"));}//获取日志本地路径NSString *zipNameString = [NSString stringWithFormat:@"%@-%@.zip",fromDateString, toDateString];NSString *zipPath = [zipDir stringByAppendingPathComponent:zipNameString];[self deleteZip:zipPath];//压缩用户日志BOOL success = [SSZipArchive createZipFileAtPath:zipPath withContentsOfDirectory:tmpLogDir withPassword:nil];if (success) {// 压缩成功return zipPath;}return nil;
}/**沙盒document目录@return document目录*/
- (NSString *)documentPath {NSString *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).lastObject;return path;
}/**沙盒cache目录@return cache目录*/
- (NSString *)cachePath {NSString *path = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).lastObject;return path;
}/**临时文件路径@return 临时文件路径*/
- (NSString *)dirTmpPath {return  NSTemporaryDirectory();
}/**创建目录文件路径@return 创建目录*/
- (NSString *)creatFolder:(NSString *)folderName at:(NSString *)dirPath {NSString *temDirectory = [dirPath stringByAppendingPathComponent:folderName];NSFileManager *fileManager = [NSFileManager defaultManager];// 创建目录BOOL res=[fileManager createDirectoryAtPath:temDirectory withIntermediateDirectories:YES attributes:nil error:nil];if (res) {return temDirectory;}else{return temDirectory;}
}#pragma mark - Private
- (NSMutableArray *)getMonthArrayWithBeginDate:(NSDate *)beginDate EndDate:(NSDate *)endDate {// 计算两个时间的差值NSCalendar *calendar = [NSCalendar currentCalendar];// 需要对比的时间数据 NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;NSCalendarUnit unit = NSCalendarUnitDay;// 对比时间差NSDateComponents *dateCom = [calendar components:unit fromDate:beginDate toDate:endDate options:0];// 两个日期之间所有天数组成的数组NSMutableArray *allDayArr = [NSMutableArray new];for (int i = 0 ; i < dateCom.day+1 ; i ++) {// n天后的天数int days = i;// 一天一共有多少秒NSTimeInterval oneDay = 24 * 60 * 60;// 指定的日期NSDate *appointDate = [NSDate dateWithTimeInterval:oneDay * days sinceDate:beginDate];// 转字符串NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];[dateFormatter setDateFormat:@"yyyy-MM-dd"]; // @"yyyy-MM-dd"NSString *appointTime = [dateFormatter stringFromDate:appointDate];[allDayArr addObject:appointTime];}return allDayArr;
}- (NSDateFormatter *)dateFormatter {static NSDateFormatter *formatter = nil;static dispatch_once_t onceToken;dispatch_once(&onceToken, ^{formatter = [[NSDateFormatter alloc] init];formatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"];formatter.dateFormat = @"yyyy-MM-dd";});return formatter;
}@end

四、获取crash一场并且输出到日志

当应用出现奔溃时候，出现crash，需要获取crash的错误信息，输出到日志Logger中。

这里使用的是uncaughtExceptionHandler方法

SDSystemCatchCrash.h

#import <Foundation/Foundation.h>
#import "SDLoggerDefine.h"NS_ASSUME_NONNULL_BEGIN@interface SDSystemCatchCrash : NSObjectvoid uncaughtExceptionHandler(NSException *exception);@endNS_ASSUME_NONNULL_END

SDSystemCatchCrash.m

#import "SDSystemCatchCrash.h"
#import "CocoaLumberjack.h"@implementation SDSystemCatchCrash//在AppDelegate中注册后，程序崩溃时会执行的方法
void uncaughtExceptionHandler(NSException *exception)
{//获取系统当前时间，（注：用[NSDate date]直接获取的是格林尼治时间，有时差）NSDateFormatter *formatter =[[NSDateFormatter alloc] init];[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];NSString *crashTime = [formatter stringFromDate:[NSDate date]];//异常的堆栈信息NSArray *stackArray = [exception callStackSymbols];//出现异常的原因NSString *reason = [exception reason];//异常名称NSString *name = [exception name];//拼接错误信息NSString *exceptionInfo = [NSString stringWithFormat:@"crashTime: %@ Exception reason: %@\nException name: %@\nException stack:%@", crashTime, name, reason, stackArray];DDLogError(@"exceptionInfo:%@", exceptionInfo);//把错误信息保存到本地文件，设置errorLogPath路径下//并且经试验，此方法写入本地文件有效。
//    NSString *errorLogPath = [NSString stringWithFormat:@"%@/Documents/error.log", NSHomeDirectory()];
//    NSError *error = nil;
//    BOOL isSuccess = [exceptionInfo writeToFile:errorLogPath atomically:YES encoding:NSUTF8StringEncoding error:nil];
//    if (!isSuccess) {
//        DLog(@"将crash信息保存到本地失败: %@", error.userInfo);
//    }
}@end

五、为了方便使用不同level Logger输出

为了方便使用不同level Logger输出，这里使用宏定义方法

SDLoggerDefine.h

#ifndef SDLoggerDefine_h
#define SDLoggerDefine_h#ifdef __OBJC__#import <UIKit/UIKit.h>#import <Foundation/Foundation.h>#import "DDLog.h"
#endif#ifdef DEBUGstatic const int ddLogLevel = DDLogLevelVerbose;
#elsestatic const int ddLogLevel = DDLogLevelWarning;
#endif#define SDErrorLogger(frmt, ...)   LOG_MAYBE(NO,                LOG_LEVEL_DEF, DDLogFlagError,   0, nil, __PRETTY_FUNCTION__, frmt, ##__VA_ARGS__)
#define SDWarnLogger(frmt, ...)    LOG_MAYBE(LOG_ASYNC_ENABLED, LOG_LEVEL_DEF, DDLogFlagWarning, 0, nil, __PRETTY_FUNCTION__, frmt, ##__VA_ARGS__)
#define SDInfoLogger(frmt, ...)    LOG_MAYBE(LOG_ASYNC_ENABLED, LOG_LEVEL_DEF, DDLogFlagInfo,    0, nil, __PRETTY_FUNCTION__, frmt, ##__VA_ARGS__)
#define SDDebugLogger(frmt, ...)   LOG_MAYBE(LOG_ASYNC_ENABLED, LOG_LEVEL_DEF, DDLogFlagDebug,   0, nil, __PRETTY_FUNCTION__, frmt, ##__VA_ARGS__)
#define SDVerboseLogger(frmt, ...) LOG_MAYBE(LOG_ASYNC_ENABLED, LOG_LEVEL_DEF, DDLogFlagVerbose, 0, nil, __PRETTY_FUNCTION__, frmt, ##__VA_ARGS__)#endif /* SDLoggerDefine_h */

六、小结

iOS开发-Logger日志功能实现。常用CocoaLumberjack来作为日志功能实现的日志框架，输出到DDTTYLogger(Xcode 控制台)、DDASLLogger(苹果日志系统)、DDFileLogger(本地文件)。通过不同的Logger Level如Verbose、Debug、Info、Warn、Error等日志输出到日志以便分析出现问题的代码。

学习记录，每天不停进步。