How do I change the style of the literature labels in the bibliography?
I'm searching about a few hours now with no luck, so maybe anyone here can help! Below you see my example and at the bottom of the post I show you what I want to get. I read a lot about the \DeclareFieldFormat method, but it seems that this one is not working for the labels. I tried it for the book title at this works fine \DeclareFieldFormat[book]{title}{\textbf{#1}}. Isn't there an equivalent for the labels?
Example document file:
\documentclass[11pt,a4paper]{scrbook}
\usepackage[ngerman]{babel}
\usepackage[babel,german=quotes]{csquotes}
\usepackage[breaklinks=true]{hyperref}
\usepackage[
style=authoryear,
backend=bibtex,
]{biblatex}
\bibliography{literature}
\renewcommand*{\labelnamepunct}{\addcolon\space}
\DeclareFieldFormat[book]{labelname}{\textbf{#1}}
\begin{document}
\cite{apple2012staticlibrary}
\cite{fowler2003patterns}
\printbibliography
\end{document}
Bibliography file:
@techreport{apple2012staticlibrary,
Author = {Apple},
Date-Added = {2013-07-18 07:52:40 +0000},
Date-Modified = {2013-07-20 11:39:36 +0000},
Institution = {Apple Inc.},
Publisher = {Apple Inc.},
Title = {Using Static Libraries in iOS},
Year = {2012}}
@book{fowler2003patterns,
Address = {Heidelberg, M{\"u}nchen, Landsberg, Frechen, Hamburg},
Author = {Martin Fowler},
Date-Added = {2013-07-17 09:26:03 +0000},
Date-Modified = {2013-07-23 06:49:25 +0000},
Publisher = {mitp-Verlag},
Series = {Software-Engineering},
Title = {Patterns f{\"u}r Enterprise-Application-Architekturen},
Year = {2003}}
This is how it looks like (Ignore the ISBN field. Its just an older screenshot):

And this is how I want it to look like (with the bold label):
Apple (2012): Using Static Libraries in iOS. Techn. Ber. Apple Inc.
Fowler, Martin (2003): Patterns für Enterprise-Application-Architekturen. Software-Engineering. Heidelberg, München, Landsberg, Frechen, Hamburg: mitp-Verlag.