reading and writing to my logfile

somecode.swift

    func existingLog() -> String? {
        if let logFileHandle = NSFileHandle(forReadingAtPath: logFile) {
            let data = logFileHandle.readDataToEndOfFile()
                return NSString(data:data, encoding:NSUTF8StringEncoding) as String?
        }
        return nil
    }
    
   func log(log: String) {
    let logLine = "\(NSDate()) \(log)\n"
    if let data = logLine.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false) {
        if let fileHandle = NSFileHandle(forWritingAtPath: logFile) {
            fileHandle.seekToEndOfFile()
            fileHandle.writeData(data)
            fileHandle.closeFile()
        } else {
            NSLog("error getting file handle for log: \(logFile)")
        }
    } else {
        NSLog("error creating data from logline")
    }

    NSLog(logLine)
    if (delegate != nil) {
        delegate!.log(logLine)
    }
}