\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{juniperbug}
\pdfinfo{
  /Title (swift.pdf)
  /Creator (Cheatography)
  /Author (juniperbug)
  /Subject (Swift Cheat Sheet)
}

% Lengths and widths
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\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{A3A3A3}
\definecolor{LightBackground}{HTML}{F3F3F3}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Swift Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{juniperbug} via \textcolor{DarkBackground}{\uline{cheatography.com/30814/cs/9243/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}juniperbug \\
  \uline{cheatography.com/juniperbug} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 2nd October, 2016.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Defining variables}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Constant}} \newline let constantVar = "Hello, World!" \newline  \newline {\bf{Implicit}} \newline var implicitVar = "Hello, World!" \newline  \newline {\bf{Explicit}} \newline var explicitVar: String = "Hello, World!"} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Loop types}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Range}} \newline for x in 1...5  \newline  \newline {\bf{Iterate through array}} \newline for item in {[}1, 2, 4, 5{]} \newline  \newline {\bf{Iterate through dictionary}} \newline for (key, value) in {[}"one":1, "two":2, ...{]} \newline  \newline {\bf{Switch methods}} \newline switch {[}"1", "2", "3", 4, 5, 6, (1, 100){]} \{ \newline     case "1":  \newline         print("1") \newline     case "2", "3": \newline         print("2 or 3") \newline         print("No fallthrough") \newline     case 4...5: \newline         print("Interval matching") \newline     case (1...100, 1...100): \newline         print("Tuples work the same.") \newline     default: \newline         print("6") \newline         print("Required in switchs") \newline         print("Must be last") \newline \} \newline  \newline {\emph{TODO: \_, value binding, fallthrough, where}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.44333 cm} x{3.53367 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Function signature anatomy}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\emph{Argument Label}} & {\emph{(optional)}} Used when calling the function \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Parameter Name & Used in the implementation of the function \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
{\emph{Return Type}} & {\emph{(optional)}} Can be a tuple for multiple return values \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
throws & {\emph{(optional)}} Causes errors to propagate up. \tn 
% Row Count 8 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{`func \seqsplit{FunctionName(ArgumentLabel} \{\{noshy\}\}ParameterName: String) throws -\textgreater{} ``\textless{}ReturnType\textgreater{} \{` \newline `~~~~// Code` \newline `\}`}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Event handling}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\{\{ac\}\}No language constructs available.% Row Count 1 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Error handling}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{ Representing errors}} \newline enum ErrorEnum: Error \{ \newline     case ErrorTypeA \newline     case ErrorTypeB: String \newline \} \newline  \newline {\bf{Propagating Errors Using Throwing Functions}} \newline func canThrowErrors() throws -\textgreater{} String \newline  \newline {\bf{Handling Errors Using Do-Catch}} \newline do \{ \newline     try results = ThrowTypeB() \newline \} catch ErrorEnum.ErrorTypeB(let errorString) \{ \newline     // Handle error \newline \}  \newline  \newline {\bf{Converting Errors to Optional Values}} \newline let x = try? someThrowingFunction() \newline  \newline {\bf{Disabling Error Propagation}} \newline let x = try! someThrowingFunction()} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}