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异常日志记录 DDLog
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互联网集市收集整理的这篇技术教程文章主要介绍了异常日志记录 DDLog，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含5262字，纯文字阅读大概需要8分钟。
内容图文
项目中如果想把异常捕获再写入文件，有个十分容易使用的库DDLog.
首先导入库，在git上下载。
一：在项目初始化指定全局LogLeve ,一般在xxxapp.m中
static const int ddLogLevel = LOG_LEVEL_VERBOSE;
二：
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification { NSExceptionHandler *exceptionHandler = [NSExceptionHandler defaultExceptionHandler] ; exceptionHandler.delegate = self; exceptionHandler.exceptionHandlingMask = NSLogAndHandleEveryExceptionMask; DBSDDFileLogger *fileLogger = [[DBSDDFileLogger alloc] init]; fileLogger.maximumFileSize = 1; // 1024*1 KB fileLogger.rollingFrequency = 1; // 60*60*60 Seconds fileLogger.logFileManager.maximumNumberOfLogFiles = 4; [DDLog addLogger:fileLogger]; }
- (BOOL)exceptionHandler:(NSExceptionHandler *)sender shouldLogException:(NSException *)exception mask:(unsigned int)mask { [self printStackTrace:exception]; return YES; }
- (void)printStackTrace:(NSException *)e//要写入log文件的信息{ NSString *stack = [[e userInfo] objectForKey:NSStackTraceKey]; NSMutableArray *args = [NSMutableArray arrayWithCapacity:20]; if (stack) { NSTask *ls = [[NSTask alloc] init]; NSString *pid = [[NSNumber numberWithInt:[[NSProcessInfo processInfo] processIdentifier]] stringValue]; [args addObject:@"-p"];//-p [args addObject:pid]; [args addObjectsFromArray:[stack componentsSeparatedByString:@""]]; // Note: function addresses are separated by double spaces, not a single space. [ls setLaunchPath:@"/usr/bin/atos"];//xcrun atos [ls setArguments:args]; // [ls launch]; NSPipe *pipe; pipe = [NSPipe pipe]; [ls setStandardOutput: pipe]; NSFileHandle *file; file = [pipe fileHandleForReading]; [ls launch]; NSData *data; data = [file readDataToEndOfFile]; NSString *string; string = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding]; NSString *strFormat = [NSString stringWithFormat:@"\n\n*************************exception begin\nexception time: %@\n%@\n*************************exception end\n\n",[NSDate date] ,string]; DDLogCError(strFormat); } else { DDLogCError(@"No stack trace available."); } }
三 。两个自定义类。这里的DBSDDFileLogger继承于DDFileLogger,目的在于自定义log文件的路径。如下：
#import
"
DBSDDFileLogger.h
"
#import
"
DBSDDLogFileManagerDefault.h
"
#define DBSLogDir @"DBstudio/Files/Logs"
@implementation DBSDDFileLogger
- (id)init{
DBSDDLogFileManagerDefault *defaultLogFileManager = [[DBSDDLogFileManagerDefault alloc] initWithLogsDirectory:[self getDBSCacheLogsDir]];
return [self initWithLogFileManager:defaultLogFileManager];
}
- (NSString*)getDBSCacheLogsDir{
NSString *dir = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)objectAtIndex:0];
NSString *cachedLogDir=[dir stringByAppendingPathComponent:DBSLogDir];
return cachedLogDir;
}
DBSDDLogFileManagerDefault 继承自 DDLogFileManagerDefault 目的在于自定义log文件的路径
@implementation
DBSDDLogFileManagerDefault
- (NSString *)generateShortUUID{
NSDate *date = [[NSDate alloc] init];
NSDateFormatter *threadUnsafeDateFormatter = [[NSDateFormatter alloc] init];
[threadUnsafeDateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4];
NSString *dateFormatString = @"yyyy-MM-dd";
[threadUnsafeDateFormatter setDateFormat:dateFormatString];
NSString *filename = [threadUnsafeDateFormatter stringFromDate:date];
return filename;
}
- (NSString *)createNewLogFile{
NSString *logsDirectory = [self logsDirectory];
int index = 1;
NSString *fileName = [NSString stringWithFormat:@"dbs-log-%@.txt", [self generateShortUUID]];
do
{
NSString *filePath = [logsDirectory stringByAppendingPathComponent:fileName];
if (![[NSFileManager defaultManager] fileExistsAtPath:filePath])
{
[[NSFileManager defaultManager] createFileAtPath:filePath contents:nil attributes:nil];
// Since we just created a new log file, we may need to delete some old log files [super deleteOldLogFiles];
NSLog(@"create file:%@",fileName);
return filePath;
}
else
{
NSString *strFile = [filePath stringByDeletingPathExtension];
NSString *strFileName = [strFile lastPathComponent];
NSString *strFileNameFormat = [self isContainCharacter:strFileName];
if (strFileNameFormat) {
strFileName = strFileNameFormat;
}
fileName =[NSString stringWithFormat:@"%@(%d).%@",strFileName,index,[filePath pathExtension]];
index++;
}
} while(YES);
}
- (NSString*)isContainCharacter:(NSString*)fileName{
NSString *strCharachter = @"(";
NSRange foundPer=[fileName rangeOfString:strCharachter options:NSCaseInsensitiveSearch];
if(foundPer.length>0) {
NSRange rang;
rang.location = 0;
rang.length = foundPer.location;
NSString *strRes = [fileName substringWithRange:rang];
return strRes;
}
else {
return nil;
}
}
- (BOOL)isLogFile:(NSString *)fileName{
if (fileName && [fileName length]>3) {
NSRange rang;
rang.location = [fileName length] - 4;
rang.length = 4;
NSString *strTmpName = [fileName substringWithRange:rang];
if ([strTmpName isEqualToString:@".txt"]) {
rang.location = 0;
rang.length = 4;
strTmpName = [fileName substringWithRange:rang];
if ([@"dbs-" isEqualToString:strTmpName]) {
return YES;
}
}
}
return NO;
}
好了，test一下
- (IBAction)test:(id)sender { //@try { NSMutableArray *array = [NSMutableArray array]; [array addObject:nil]; //} //@catch (NSException *exception) { //@throw exception; //} //@finally { //} }
DDLogger比较强悍的地方是可以记录所有异常，包括你catch了的。
原文：http://www.cnblogs.com/zhidao-chen/p/3583690.html
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