[IOS]Crash捕获及日志保存

一、Crash捕获

iOS端的crash分为两类，一类是NSException异常，另外一类是Signal信号异常。这里只保存NSException异常。

代码实现

//注册Handler
void InstallSYUncaughtExceptionHandler(void)
{
    NSSetUncaughtExceptionHandler(&HandleException);
}
//异常处理
void HandleException(NSException *exception)
{
    // 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];
    NSString *exceptionInfo = [NSString stringWithFormat:@"Exception reason：%@\nException name：%@\nException stack：%@",name, reason, stackArray];
    [SYUncaughtExceptionHandler saveCreash:exceptionInfo];
}
//保存文件
+(void)saveCreash:(NSString *)exceptionInfo
{
    NSString * _libPath  = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"APPCrash"];
    if (![[NSFileManager defaultManager] fileExistsAtPath:_libPath]){
        [[NSFileManager defaultManager] createDirectoryAtPath:_libPath 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 * savePath = [_libPath stringByAppendingFormat:@"/error%@.log",dateStr];
    BOOL sucess = [exceptionInfo writeToFile:savePath atomically:YES encoding:NSUTF8StringEncoding error:nil];
    NSLog(@"YES sucess:%d",sucess);
}

二、保存控制台日志文件

某些bug无法链接code调试，我们可以保存控制台输出日志，以便排查bug。

代码实现

#pragma mark - 保存日志文件
+ (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;
    }
    //获取Document目录下的Log文件夹，若没有则新建
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *logDirectory = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"APPLog"];
    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:@"/%@.txt",dateStr];
    // freopen 重定向输出输出流，将log输入到文件
    freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stdout);
    freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stderr);
}

附上demo地址：https://github.com/pizazzsy/CrashCaptureDemo