moderncv adding title to letter?

Question

\documentclass[11pt,a4paper,sans]{moderncv}  
\moderncvstyle{classic}                             
\moderncvcolor{green}                            
\usepackage[scale=0.75]{geometry}
\usepackage[ngerman]{babel}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{multicol}
\usepackage{xpatch}
\xpatchcmd{\cventry}{.\strut}{\strut}{}{}
\xpatchcmd{\cvitem}{\raggedleft\hintstyle{#2}}{\raggedright\hintstyle{#2}}{}{}
\xpatchcmd*{\cvitemwithcomment}{\bfseries}{\mdseries}{}{}
\makeatletter
\xpatchcmd{\makeletterclosing}{\bfseries \@firstname~\@lastname}
                              {\includegraphics[width=4cm, height=1cm]{unterschrift.jpg}
                              \vspace{-10pt}\par
                               \bfseries \@firstname~\@lastname}
                              {}{}
\makeatother
% personal data
\name{John}{Doe}
\title{Lebenslauf}                               % optional, remove / comment the line if not wanted
\address{asdfdsf 12}{77777 scity}{Germany}
\phone[mobile]{+49~(xxx)~xxx~xxx}                   %
\phone[fixed]{+49~(xxx)~xxx~xxx}
\email{XXXXX}                               
\photo[64pt][0.4pt]{picture}                       
\renewcommand*{\bibliographyitemlabel}{[\arabic{enumiv}]}
\usepackage{ifthen}       % <===========================================
\newboolean{CV}
\setboolean{CV}{false}    % <===========================================
\newboolean{Letter}
\setboolean{Letter}{true} % <===========================================
\begin{document}
\ifthenelse{\boolean{CV}}{% print CV
\makecvtitle
\setlength{\hintscolumnwidth}{0.195\textwidth}
\section{Hobbys}
\cvlistitem{dance}
\cvlistitem{chess}
\cvlistitem{cook}
\cvlistitem{swim}
\ \\
\ \\
\includegraphics[width=4cm, height=1cm]{unterschrift.jpg} \\
ccity, 10. Oktober 2017
\clearpage
}{% print no CV
}
\title{Bewerbung um XXX}
\ifthenelse{\boolean{Letter}}{% print Cover Letter
\recipient{Xxxy}{Xxxxx\\XXXXX\\XXXXXXXX}
\date{ccity, 10.10.2017}
\opening{\textbf{Sehr geehrte Damen und Herren},}
\closing{Mit freundlichen Gr"u"sen,}
\enclosure[Im Anhang]{Lebenslauf}          
\makelettertitle

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\makeletterclosing

}{% print no Cover Letter
}

\end{document}

I want to add a title to my letter. The \title{} doesn't print any title. Can someone please help?

Answer 1

In moderncv, the classic cover letter does not use the information you provide in the \title. Basically, it was written to create that page without providing any title.

How the cover letter is created

A cover letter is created using some macros to provide information, a macro to create a header and other to create the signature and footer:

\clearpage                             % start a new page

\recipient{ ... }                      % provide information
\opening{ ... }
\closing{ ... }
\enclosure[ ... ]{ ... }
\makelettertitle                       % print title / header

...                                    % print content
\makeletterclosing                     % print letter footer / signature

The \makelettertitle and \makeletterclosing do not use the information of the title (@title) to create the content.

How to add a title

At the end, A moderncv document is a LaTeX document. You can add content before or after the header provided by the template. For instance, you can add a title before the header or after the salutation.

\clearpage                             % start a new page
\recipient{ ... }                      % provide information
...

{\centering \Huge Add a title \par}    % add a text before header
\makelettertitle                       % print title / header
{\Huge Add another title \par}         % add a text after header   

Modifying moderncv

You may be interested on modifying the moderncv template. You can get the source code from Github.

If you want to change the code, note that moderncv has many "styles". The \makelettertitle is defined empty in the moderncv.cls file.

% makes the letter title
% usage: \makelettertitle
\newcommand*{\makelettertitle}{}    % for the version v1.2.0

The macro is redefined in each style. For instance, if you use the classic style, that style is defined in moderncvstyleclassic.sty file. You must look for the \renewcommand*{\makelettertitle} in the file for the style you are using and change the code.

\renewcommand*{\makelettertitle}{%
   \recomputeletterlengths%
   :
}

Answer 2

The banking moderncvstyle prints a title in the letter head. If you want to use a moderncvstyle of your choice, you will have to redefine the makeletterhead command.