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% Document Info
\author{zyqhi}
\pdfinfo{
  /Title (swift-5-reference.pdf)
  /Creator (Cheatography)
  /Author (zyqhi)
  /Subject (Swift 5 Reference Cheat Sheet)
}

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\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
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    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
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\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Swift 5 Reference Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{zyqhi} via \textcolor{DarkBackground}{\uline{cheatography.com/79780/cs/19305/}}}
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\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}zyqhi \\
  \uline{cheatography.com/zyqhi} \\
  \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 10th April, 2019.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
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  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
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\begin{document}
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\begin{multicols*}{2}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Closures}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{// Syntax \newline \{ ({\emph{parameters}}) -\textgreater{} {\emph{return type}} in \newline     {\emph{statements}} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{1.}} Closures are self-contained blocks of functionality that can be passed around and used in your code.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Closures Syntax Optimizations}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{let names = {[}"Chris", "Alex", "Ewa", "Barry", "Daniella"{]} \newline  \newline // 1 \newline reversedNames = names.sorted(by: \{ (s1: String, s2: String) -\textgreater{} Bool in \newline     return s1 \textgreater{} s2 \newline \}) \newline  \newline // 2. Inferring Type From Context \newline reversedNames = names.sorted(by: \{ s1, s2 in return s1 \textgreater{} s2 \} ) \newline  \newline // 3. Implicit Returns from Single-Expression Closures \newline reversedNames = names.sorted(by: \{ s1, s2 in s1 \textgreater{} s2 \} ) \newline  \newline // 4. Shorthand Argument Names \newline reversedNames = names.sorted(by: \{ \$0 \textgreater{} \$1 \} ) \newline  \newline // 5. Operator Methods, operator (\textgreater{}) is a method \newline reversedNames = names.sorted(by: \textgreater{}) \newline  \newline // 6. Trailing Closures \newline reversedNames = names.sorted() \{ \$0 \textgreater{} \$1 \} \newline // function with only one arguement \newline reversedNames = names.sorted \{ \$0 \textgreater{} \$1 \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{1.}} A trailing closure is written after the function call's parentheses, even though it is still an argument to the function.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Escaping Closures}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{var completionHandlers: {[}() -\textgreater{} Void{]} = {[}{]} \newline  \newline func \seqsplit{someFunctionWithEscapingClosure(handler:} @escaping () -\textgreater{} Void) \{ \newline     \seqsplit{completionHandlers.append(handler)} \newline \} \newline  \newline func \seqsplit{someFunctionWithNonescapingClosure(closure:} () -\textgreater{} Void) \{ \newline     closure() \newline \} \newline  \newline class SomeClass \{ \newline     var x = 10 \newline     func doSomething() \{ \newline         \seqsplit{someFunctionWithEscapingClosure} \{ \newline             self.x = 100  \newline         \} \newline         \seqsplit{someFunctionWithNonescapingClosure} \{  \newline             x = 200  \newline         \} \newline     \} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{1.}} A closure is said to escape a function when the closure is passed as an argument to the function, but is called after the function returns. \newline {\bf{2.}} Marking a closure with {\emph{@escaping}} means you have to refer to self explicitly within the closure.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Autoclosures}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{var customersInLine = {[}"Chris", "Alex", "Ewa", "Barry", "Daniella"{]} \newline  \newline func serve(customer customerProvider: @autoclosure () -\textgreater{} String) \{ \newline     print("Now serving \textbackslash{}(customerProvider())!") \newline \} \newline serve(customer: \seqsplit{customersInLine.remove(at:} 0))} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{1.}} An {\emph{autoclosure}} is a closure that is automatically created to wrap an expression that's being passed as an argument to a function. \newline {\bf{2.}} An autoclosure lets you delay evaluation.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Functions}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{8.4cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/zyqhi_1554775577_B6AE8D45-D66D-4813-A1D4-5B13785AF6D5.jpg}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{1.}} Functions are self-contained chunks of code that perform a specific task.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Property}}  \tn
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\mymulticolumn{1}{x{8.4cm}}{class SomeClass \{ \newline     // Type Property \newline     static var storedTypeProperty = "Some value." \newline     static var computedTypeProperty: Int \{ \newline         return 27 \newline     \} \newline     class var \seqsplit{overrideableComputedTypeProperty:} Int \{ \newline         return 107 \newline     \} \newline      \newline     // Lazy Stored Property \newline     lazy var view = UIView() \newline      \newline     // Stored Property \newline     let data = {[}String{]}() \newline      \newline     // Computed Property \newline     var id: Int = 0 \{ \newline         willSet \{ \newline             print("About to set \textbackslash{}(newValue)") \newline         \} \newline         didSet \{ \newline             print("Did set id to \textbackslash{}(id), oldValue is \textbackslash{}(oldValue)") \newline         \} \newline     \} \newline      \newline     var idStr: String \{ \newline         set \{ \newline             id = Int(idStr) ?? 0 \newline         \} \newline         get \{ \newline             return String(id) \newline         \} \newline     \} \newline      \newline     var desc: String \{ \newline         return "Readonly property." \newline     \} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{1.}} Computed properties must be declared with the {\emph{var}} keyword, because their value is not fixed. \newline {\bf{2.}} A lazy stored property is a property whose initial value is not calculated until the first time it is used.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Enumeration}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{/// Use enum \newline enum Planet \{ \newline     case mercury, venus, earth, mars, jupiter, saturn, uranus, neptune \newline \} \newline  \newline var p = Planet.venus \newline p = .uranus \newline  \newline /// Iterating over Enumeration Cases \newline enum Beverage: CaseIterable \{ \newline     case coffee, tea, juice \newline \} \newline let numberOfChoices = Beverage.allCases.count \newline print("\textbackslash{}(numberOfChoices) beverages available") \newline  \newline for beverage in Beverage.allCases \{ \newline     print("bevergae is \textbackslash{}(beverage)") \newline \} \newline  \newline /// Associated Values \newline enum Barcode \{ \newline     case upc(Int, Int, Int, Int) \newline     case qrCode(String) \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{1.}} An enumeration defines a common type for a group of related values and enables you to work with those values in a type-safe way within your code. \newline {\bf{2.}} Conforming to the {\emph{CaseIterable}} protocol makes a enum iterable.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}