ios 将NSLog日志重定向输出到文件中保存

#pragma mark - 用户方法,将nslog的输出信息写入到dr.log文件中；
// 将NSlog打印信息保存到Document目录下的文件中
- (void)redirectNSlogToDocumentFolder
{

//如果已经连接Xcode调试则不输出到文件
//    if(isatty(STDOUT_FILENO)) {
//        return;
//    }
//
//    UIDevice *device = [UIDevice currentDevice];
//    if([[device model] hasSuffix:@"Simulator"]){ //在模拟器不保存到文件中
//        return;
//    }

//将NSlog打印信息保存到Document目录下的Log文件夹下
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *logDirectory = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Log"];

NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL fileExists = [fileManager fileExistsAtPath:logDirectory];
if (!fileExists) {
[fileManager createDirectoryAtPath:logDirectory  withIntermediateDirectories:YES attributes:nil error:nil];
}

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"]];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; //每次启动后都保存一个新的日志文件中
NSString *dateStr = [formatter stringFromDate:[NSDate date]];
NSString *logFilePath = [logDirectory stringByAppendingFormat:@"/%@.log",dateStr];

// 将log输入到文件
freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stdout);
freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stderr);

//未捕获的Objective-C异常日志
NSSetUncaughtExceptionHandler(&UncaughtExceptionHandler);

//    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//    NSString *documentDirectory = [paths objectAtIndex:0];
//    NSString *fileName = [NSString stringWithFormat:@"dr.log"];// 注意不是NSData!
//    NSString *logFilePath = [documentDirectory stringByAppendingPathComponent:fileName];
//    // 先删除已经存在的文件
//    NSFileManager *defaultManager = [NSFileManager defaultManager];
//    [defaultManager removeItemAtPath:logFilePath error:nil];
//
//    // 将log输入到文件
//    freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stdout);
//    freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stderr);
//    freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stdin);

//把错误日志发送到邮箱
NSString *urlStr = [NSString stringWithFormat:@"mailto://934111653@qq.com?subject=bug报告&body=感谢您的配合!<br><br><br>错误详情:<br>%@",dateStr ];
NSURL *url = [NSURL URLWithString:[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
[[UIApplication sharedApplication] openURL:url];

}

void UncaughtExceptionHandler(NSException* exception)
{
NSString* name = [ exception name ];
NSString* reason = [ exception reason ];
NSArray* symbols = [ exception callStackSymbols ]; // 异常发生时的调用栈
NSMutableString* strSymbols = [ [ NSMutableString alloc ] init ]; //将调用栈拼成输出日志的字符串
for ( NSString* item in symbols )
{
[ strSymbols appendString: item ];
[ strSymbols appendString: @"\r\n" ];
}

//将crash日志保存到Document目录下的Log文件夹下
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *logDirectory = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Log"];

NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:logDirectory]) {
[fileManager createDirectoryAtPath:logDirectory  withIntermediateDirectories:YES attributes:nil error:nil];
}

NSString *logFilePath = [logDirectory stringByAppendingPathComponent:@"UncaughtException.log"];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"]];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSString *dateStr = [formatter stringFromDate:[NSDate date]];

NSString *crashString = [NSString stringWithFormat:@"<- %@ ->[ Uncaught Exception ]\r\nName: %@, Reason: %@\r\n[ Fe Symbols Start ]\r\n%@[ Fe Symbols End ]\r\n\r\n", dateStr, name, reason, strSymbols];
//把错误日志写到文件中
if (![fileManager fileExistsAtPath:logFilePath]) {
[crashString writeToFile:logFilePath atomically:YES encoding:NSUTF8StringEncoding error:nil];
}else{
NSFileHandle *outFile = [NSFileHandle fileHandleForWritingAtPath:logFilePath];
[outFile seekToEndOfFile];
[outFile writeData:[crashString dataUsingEncoding:NSUTF8StringEncoding]];
[outFile closeFile];
}

//把错误日志发送到邮箱
NSString *urlStr = [NSString stringWithFormat:@"mailto://934111653@qq.com?subject=bug报告&body=感谢您的配合!<br><br><br>错误详情:<br>%@",crashString ];
NSURL *url = [NSURL URLWithString:[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
[[UIApplication sharedApplication] openURL:url];
}

转自：http://www.xuebuyuan.com/2128136.html