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5.1.0
docs/Structs/DataResponse.html
1 116 строк
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Jon Shier
Prepare 5.1 Release (#3143)
05 апр 2020, 04:58
Не верифицирован
05 апр 2020, 04:58
fca036f
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<!DOCTYPE html> <html lang="en"> <head> <title>DataResponse Structure Reference</title> <link rel="stylesheet" type="text/css" href="../css/jazzy.css" /> <link rel="stylesheet" type="text/css" href="../css/highlight.css" /> <meta charset="utf-8"> <script src="../js/jquery.min.js" defer></script> <script src="../js/jazzy.js" defer></script> <script src="../js/lunr.min.js" defer></script> <script src="../js/typeahead.jquery.js" defer></script> <script src="../js/jazzy.search.js" defer></script> </head> <body> <a name="//apple_ref/swift/Struct/DataResponse" class="dashAnchor"></a> <a title="DataResponse Structure Reference"></a> <header class="header"> <p class="header-col header-col--primary"> <a class="header-link" href="../index.html"> Alamofire Docs </a> (97% documented) </p> <p class="header-col--secondary"> <form role="search" action="../search.json"> <input type="text" placeholder="Search documentation" data-typeahead> </form> </p> <p class="header-col header-col--secondary"> <a 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class="nav-group-task-link" href="../Structs/URLEncoding/ArrayEncoding.html">– ArrayEncoding</a> </li> <li class="nav-group-task"> <a class="nav-group-task-link" href="../Structs/URLEncoding/BoolEncoding.html">– BoolEncoding</a> </li> </ul> </li> <li class="nav-group-name"> <a class="nav-group-name-link" href="../Typealiases.html">Type Aliases</a> <ul class="nav-group-tasks"> <li class="nav-group-task"> <a class="nav-group-task-link" href="../Typealiases.html#/s:9Alamofire14AFDataResponsea">AFDataResponse</a> </li> <li class="nav-group-task"> <a class="nav-group-task-link" href="../Typealiases.html#/s:9Alamofire18AFDownloadResponsea">AFDownloadResponse</a> </li> <li class="nav-group-task"> <a class="nav-group-task-link" href="../Typealiases.html#/s:9Alamofire8AFResulta">AFResult</a> </li> <li class="nav-group-task"> <a class="nav-group-task-link" href="../Typealiases.html#/s:9Alamofire12AdaptHandlera">AdaptHandler</a> </li> <li class="nav-group-task"> <a class="nav-group-task-link" href="../Typealiases.html#/s:9Alamofire10Parametersa">Parameters</a> </li> <li class="nav-group-task"> <a class="nav-group-task-link" href="../Typealiases.html#/s:9Alamofire12RetryHandlera">RetryHandler</a> </li> </ul> </li> </ul> </nav> <article class="main-content"> <section class="section"> <div class="section-content top-matter"> <h1>DataResponse</h1> <div class="declaration"> <div class="language"> <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">struct</span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">Success</span><span class="p">,</span> <span class="kt">Failure</span><span class="o">></span> <span class="k">where</span> <span class="kt">Failure</span> <span class="p">:</span> <span class="kt">Error</span></code></pre> <pre class="highlight swift"><code><span class="kd">extension</span> <span class="kt">DataResponse</span><span class="p">:</span> <span class="kt">CustomStringConvertible</span><span class="p">,</span> <span class="kt">CustomDebugStringConvertible</span></code></pre> </div> </div> <p>Type used to store all values associated with a serialized response of a <code><a href="../Classes/DataRequest.html">DataRequest</a></code> or <code><a href="../Classes/UploadRequest.html">UploadRequest</a></code>.</p> </div> </section> <section class="section"> <div class="section-content"> <div class="task-group"> <ul class="item-container"> <li class="item"> <div> <code> <a name="/s:9Alamofire12DataResponseV7request10Foundation10URLRequestVSgvp"></a> <a name="//apple_ref/swift/Property/request" class="dashAnchor"></a> <a class="token" href="#/s:9Alamofire12DataResponseV7request10Foundation10URLRequestVSgvp">request</a> </code> </div> <div class="height-container"> <div class="pointer-container"></div> <section class="section"> <div class="pointer"></div> <div class="abstract"> <p>The URL request sent to the server.</p> </div> <div class="declaration"> <h4>Declaration</h4> <div class="language"> <p class="aside-title">Swift</p> <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">let</span> <span class="nv">request</span><span class="p">:</span> <span class="kt">URLRequest</span><span class="p">?</span></code></pre> </div> </div> </section> </div> </li> <li class="item"> <div> <code> <a name="/s:9Alamofire12DataResponseV8responseSo17NSHTTPURLResponseCSgvp"></a> <a name="//apple_ref/swift/Property/response" class="dashAnchor"></a> <a class="token" href="#/s:9Alamofire12DataResponseV8responseSo17NSHTTPURLResponseCSgvp">response</a> </code> </div> <div class="height-container"> <div class="pointer-container"></div> <section class="section"> <div class="pointer"></div> <div class="abstract"> <p>The server’s response to the URL request.</p> </div> <div class="declaration"> <h4>Declaration</h4> <div class="language"> <p class="aside-title">Swift</p> <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">let</span> <span class="nv">response</span><span class="p">:</span> <span class="kt">HTTPURLResponse</span><span class="p">?</span></code></pre> </div> </div> </section> </div> </li> <li class="item"> <div> <code> <a name="/s:9Alamofire12DataResponseV4data10Foundation0B0VSgvp"></a> <a name="//apple_ref/swift/Property/data" class="dashAnchor"></a> <a class="token" href="#/s:9Alamofire12DataResponseV4data10Foundation0B0VSgvp">data</a> </code> </div> <div class="height-container"> <div class="pointer-container"></div> <section class="section"> <div class="pointer"></div> <div class="abstract"> <p>The data returned by the server.</p> </div> <div class="declaration"> <h4>Declaration</h4> <div class="language"> <p class="aside-title">Swift</p> <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">let</span> <span class="nv">data</span><span class="p">:</span> <span class="kt">Data</span><span class="p">?</span></code></pre> </div> </div> </section> </div> </li> <li class="item"> <div> <code> <a name="/s:9Alamofire12DataResponseV7metricsSo23NSURLSessionTaskMetricsCSgvp"></a> <a name="//apple_ref/swift/Property/metrics" class="dashAnchor"></a> <a class="token" href="#/s:9Alamofire12DataResponseV7metricsSo23NSURLSessionTaskMetricsCSgvp">metrics</a> </code> </div> <div class="height-container"> <div class="pointer-container"></div> <section class="section"> <div class="pointer"></div> <div class="abstract"> <p>The final metrics of the response.</p> <div class="aside aside-note"> <p class="aside-title">Note</p> Due to <code>FB7624529</code>, collection of <code>URLSessionTaskMetrics</code> on watchOS is currently disabled.` </div> </div> <div class="declaration"> <h4>Declaration</h4> <div class="language"> <p class="aside-title">Swift</p> <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">let</span> <span class="nv">metrics</span><span class="p">:</span> <span class="kt">URLSessionTaskMetrics</span><span class="p">?</span></code></pre> </div> </div> </section> </div> </li> <li class="item"> <div> <code> <a name="/s:9Alamofire12DataResponseV21serializationDurationSdvp"></a> <a name="//apple_ref/swift/Property/serializationDuration" class="dashAnchor"></a> <a class="token" href="#/s:9Alamofire12DataResponseV21serializationDurationSdvp">serializationDuration</a> </code> </div> <div class="height-container"> <div class="pointer-container"></div> <section class="section"> <div class="pointer"></div> <div class="abstract"> <p>The time taken to serialize the response.</p> </div> <div class="declaration"> <h4>Declaration</h4> <div class="language"> <p class="aside-title">Swift</p> <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">let</span> <span class="nv">serializationDuration</span><span class="p">:</span> <span class="kt">TimeInterval</span></code></pre> </div> </div> </section> </div> </li> <li class="item"> <div> <code> <a name="/s:9Alamofire12DataResponseV6results6ResultOyxq_Gvp"></a> <a name="//apple_ref/swift/Property/result" class="dashAnchor"></a> <a class="token" href="#/s:9Alamofire12DataResponseV6results6ResultOyxq_Gvp">result</a> </code> </div> <div class="height-container"> <div class="pointer-container"></div> <section class="section"> <div class="pointer"></div> <div class="abstract"> <p>The result of response serialization.</p> </div> <div class="declaration"> <h4>Declaration</h4> <div class="language"> <p class="aside-title">Swift</p> <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">let</span> <span class="nv">result</span><span class="p">:</span> <span class="kt">Result</span><span class="o"><</span><span class="kt">Success</span><span class="p">,</span> <span class="kt">Failure</span><span class="o">></span></code></pre> </div> </div> </section> </div> </li> <li class="item"> <div> <code> <a name="/s:9Alamofire12DataResponseV5valuexSgvp"></a> <a name="//apple_ref/swift/Property/value" class="dashAnchor"></a> <a class="token" href="#/s:9Alamofire12DataResponseV5valuexSgvp">value</a> </code> </div> <div class="height-container"> <div class="pointer-container"></div> <section class="section"> <div class="pointer"></div> <div class="abstract"> <p>Returns the associated value of the result if it is a success, <code>nil</code> otherwise.</p> </div> <div class="declaration"> <h4>Declaration</h4> <div class="language"> <p class="aside-title">Swift</p> <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">value</span><span class="p">:</span> <span class="kt">Success</span><span class="p">?</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre> </div> </div> </section> </div> </li> <li class="item"> <div> <code> <a name="/s:9Alamofire12DataResponseV5errorq_Sgvp"></a> <a name="//apple_ref/swift/Property/error" class="dashAnchor"></a> <a class="token" href="#/s:9Alamofire12DataResponseV5errorq_Sgvp">error</a> </code> </div> <div class="height-container"> <div class="pointer-container"></div> <section class="section"> <div class="pointer"></div> <div class="abstract"> <p>Returns the associated error value if the result if it is a failure, <code>nil</code> otherwise.</p> </div> <div class="declaration"> <h4>Declaration</h4> <div class="language"> <p class="aside-title">Swift</p> <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">error</span><span class="p">:</span> <span class="kt">Failure</span><span class="p">?</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre> </div> </div> </section> </div> </li> <li class="item"> <div> <code> <a name="/s:9Alamofire12DataResponseV7request8response4data7metrics21serializationDuration6resultACyxq_G10Foundation10URLRequestVSg_So17NSHTTPURLResponseCSgAK0B0VSgSo23NSURLSessionTaskMetricsCSgSds6ResultOyxq_Gtcfc"></a> <a name="//apple_ref/swift/Method/init(request:response:data:metrics:serializationDuration:result:)" class="dashAnchor"></a> <a class="token" href="#/s:9Alamofire12DataResponseV7request8response4data7metrics21serializationDuration6resultACyxq_G10Foundation10URLRequestVSg_So17NSHTTPURLResponseCSgAK0B0VSgSo23NSURLSessionTaskMetricsCSgSds6ResultOyxq_Gtcfc">init(request:<wbr>response:<wbr>data:<wbr>metrics:<wbr>serializationDuration:<wbr>result:<wbr>)</a> </code> </div> <div class="height-container"> <div class="pointer-container"></div> <section class="section"> <div class="pointer"></div> <div class="abstract"> <p>Creates a <code>DataResponse</code> instance with the specified parameters derived from the response serialization.</p> </div> <div class="declaration"> <h4>Declaration</h4> <div class="language"> <p class="aside-title">Swift</p> <pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="nv">request</span><span class="p">:</span> <span class="kt">URLRequest</span><span class="p">?,</span> <span class="nv">response</span><span class="p">:</span> <span class="kt">HTTPURLResponse</span><span class="p">?,</span> <span class="nv">data</span><span class="p">:</span> <span class="kt">Data</span><span class="p">?,</span> <span class="nv">metrics</span><span class="p">:</span> <span class="kt">URLSessionTaskMetrics</span><span class="p">?,</span> <span class="nv">serializationDuration</span><span class="p">:</span> <span class="kt">TimeInterval</span><span class="p">,</span> <span class="nv">result</span><span class="p">:</span> <span class="kt">Result</span><span class="o"><</span><span class="kt">Success</span><span class="p">,</span> <span class="kt">Failure</span><span class="o">></span><span class="p">)</span></code></pre> </div> </div> <div> <h4>Parameters</h4> <table class="graybox"> <tbody> <tr> <td> <code> <em>request</em> </code> </td> <td> <div> <p>The <code>URLRequest</code> sent to the server.</p> </div> </td> </tr> <tr> <td> <code> <em>response</em> </code> </td> <td> <div> <p>The <code>HTTPURLResponse</code> from the server.</p> </div> </td> </tr> <tr> <td> <code> <em>data</em> </code> </td> <td> <div> <p>The <code>Data</code> returned by the server.</p> </div> </td> </tr> <tr> <td> <code> <em>metrics</em> </code> </td> <td> <div> <p>The <code>URLSessionTaskMetrics</code> of the <code><a href="../Classes/DataRequest.html">DataRequest</a></code> or <code><a href="../Classes/UploadRequest.html">UploadRequest</a></code>.</p> </div> </td> </tr> <tr> <td> <code> <em>serializationDuration</em> </code> </td> <td> <div> <p>The duration taken by serialization.</p> </div> </td> </tr> <tr> <td> <code> <em>result</em> </code> </td> <td> <div> <p>The <code>Result</code> of response serialization.</p> </div> </td> </tr> </tbody> </table> </div> </section> </div> </li> <li class="item"> <div> <code> <a name="/s:9Alamofire12DataResponseV11descriptionSSvp"></a> <a name="//apple_ref/swift/Property/description" class="dashAnchor"></a> <a class="token" href="#/s:9Alamofire12DataResponseV11descriptionSSvp">description</a> </code> </div> <div class="height-container"> <div class="pointer-container"></div> <section class="section"> <div class="pointer"></div> <div class="abstract"> <p>The textual representation used when written to an output stream, which includes whether the result was a success or failure.</p> </div> <div class="declaration"> <h4>Declaration</h4> <div class="language"> <p class="aside-title">Swift</p> <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">description</span><span class="p">:</span> <span class="kt">String</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre> </div> </div> </section> </div> </li> <li class="item"> <div> <code> <a name="/s:9Alamofire12DataResponseV16debugDescriptionSSvp"></a> <a name="//apple_ref/swift/Property/debugDescription" class="dashAnchor"></a> <a class="token" href="#/s:9Alamofire12DataResponseV16debugDescriptionSSvp">debugDescription</a> </code> </div> <div class="height-container"> <div class="pointer-container"></div> <section class="section"> <div class="pointer"></div> <div class="abstract"> <p>The debug textual representation used when written to an output stream, which includes the URL request, the URL response, the server data, the duration of the network and serialization actions, and the response serialization result.</p> </div> <div class="declaration"> <h4>Declaration</h4> <div class="language"> <p class="aside-title">Swift</p> <pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">debugDescription</span><span class="p">:</span> <span class="kt">String</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre> </div> </div> </section> </div> </li> <li class="item"> <div> <code> <a name="/s:9Alamofire12DataResponseV3mapyACyqd__q_Gqd__xXElF"></a> <a name="//apple_ref/swift/Method/map(_:)" class="dashAnchor"></a> <a class="token" href="#/s:9Alamofire12DataResponseV3mapyACyqd__q_Gqd__xXElF">map(_:<wbr>)</a> </code> </div> <div class="height-container"> <div class="pointer-container"></div> <section class="section"> <div class="pointer"></div> <div class="abstract"> <p>Evaluates the specified closure when the result of this <code>DataResponse</code> is a success, passing the unwrapped result value as a parameter.</p> <p>Use the <code>map</code> method with a closure that does not throw. For example:</p> <pre class="highlight swift"><code><span class="k">let</span> <span class="nv">possibleData</span><span class="p">:</span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">Data</span><span class="o">></span> <span class="o">=</span> <span class="o">...</span> <span class="k">let</span> <span class="nv">possibleInt</span> <span class="o">=</span> <span class="n">possibleData</span><span class="o">.</span><span class="n">map</span> <span class="p">{</span> <span class="nv">$0</span><span class="o">.</span><span class="n">count</span> <span class="p">}</span> </code></pre> </div> <div class="declaration"> <h4>Declaration</h4> <div class="language"> <p class="aside-title">Swift</p> <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="n">map</span><span class="o"><</span><span class="kt">NewSuccess</span><span class="o">></span><span class="p">(</span><span class="n">_</span> <span class="nv">transform</span><span class="p">:</span> <span class="p">(</span><span class="kt">Success</span><span class="p">)</span> <span class="o">-></span> <span class="kt">NewSuccess</span><span class="p">)</span> <span class="o">-></span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">NewSuccess</span><span class="p">,</span> <span class="kt">Failure</span><span class="o">></span></code></pre> </div> </div> <div> <h4>Parameters</h4> <table class="graybox"> <tbody> <tr> <td> <code> <em>transform</em> </code> </td> <td> <div> <p>A closure that takes the success value of the instance’s result.</p> </div> </td> </tr> </tbody> </table> </div> <div> <h4>Return Value</h4> <p>A <code>DataResponse</code> whose result wraps the value returned by the given closure. If this instance’s result is a failure, returns a response wrapping the same failure.</p> </div> </section> </div> </li> <li class="item"> <div> <code> <a name="/s:9Alamofire12DataResponseV6tryMapyACyqd__s5Error_pGqd__xKXElF"></a> <a name="//apple_ref/swift/Method/tryMap(_:)" class="dashAnchor"></a> <a class="token" href="#/s:9Alamofire12DataResponseV6tryMapyACyqd__s5Error_pGqd__xKXElF">tryMap(_:<wbr>)</a> </code> </div> <div class="height-container"> <div class="pointer-container"></div> <section class="section"> <div class="pointer"></div> <div class="abstract"> <p>Evaluates the given closure when the result of this <code>DataResponse</code> is a success, passing the unwrapped result value as a parameter.</p> <p>Use the <code>tryMap</code> method with a closure that may throw an error. For example:</p> <pre class="highlight swift"><code><span class="k">let</span> <span class="nv">possibleData</span><span class="p">:</span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">Data</span><span class="o">></span> <span class="o">=</span> <span class="o">...</span> <span class="k">let</span> <span class="nv">possibleObject</span> <span class="o">=</span> <span class="n">possibleData</span><span class="o">.</span><span class="n">tryMap</span> <span class="p">{</span> <span class="k">try</span> <span class="kt">JSONSerialization</span><span class="o">.</span><span class="nf">jsonObject</span><span class="p">(</span><span class="nv">with</span><span class="p">:</span> <span class="nv">$0</span><span class="p">)</span> <span class="p">}</span> </code></pre> </div> <div class="declaration"> <h4>Declaration</h4> <div class="language"> <p class="aside-title">Swift</p> <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="n">tryMap</span><span class="o"><</span><span class="kt">NewSuccess</span><span class="o">></span><span class="p">(</span><span class="n">_</span> <span class="nv">transform</span><span class="p">:</span> <span class="p">(</span><span class="kt">Success</span><span class="p">)</span> <span class="k">throws</span> <span class="o">-></span> <span class="kt">NewSuccess</span><span class="p">)</span> <span class="o">-></span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">NewSuccess</span><span class="p">,</span> <span class="kt">Error</span><span class="o">></span></code></pre> </div> </div> <div> <h4>Parameters</h4> <table class="graybox"> <tbody> <tr> <td> <code> <em>transform</em> </code> </td> <td> <div> <p>A closure that takes the success value of the instance’s result.</p> </div> </td> </tr> </tbody> </table> </div> <div> <h4>Return Value</h4> <p>A success or failure <code>DataResponse</code> depending on the result of the given closure. If this instance’s result is a failure, returns the same failure.</p> </div> </section> </div> </li> <li class="item"> <div> <code> <a name="/s:9Alamofire12DataResponseV8mapErroryACyxqd__Gqd__q_XEs0E0Rd__lF"></a> <a name="//apple_ref/swift/Method/mapError(_:)" class="dashAnchor"></a> <a class="token" href="#/s:9Alamofire12DataResponseV8mapErroryACyxqd__Gqd__q_XEs0E0Rd__lF">mapError(_:<wbr>)</a> </code> </div> <div class="height-container"> <div class="pointer-container"></div> <section class="section"> <div class="pointer"></div> <div class="abstract"> <p>Evaluates the specified closure when the <code>DataResponse</code> is a failure, passing the unwrapped error as a parameter.</p> <p>Use the <code>mapError</code> function with a closure that does not throw. For example:</p> <pre class="highlight swift"><code><span class="k">let</span> <span class="nv">possibleData</span><span class="p">:</span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">Data</span><span class="o">></span> <span class="o">=</span> <span class="o">...</span> <span class="k">let</span> <span class="nv">withMyError</span> <span class="o">=</span> <span class="n">possibleData</span><span class="o">.</span><span class="n">mapError</span> <span class="p">{</span> <span class="kt">MyError</span><span class="o">.</span><span class="nf">error</span><span class="p">(</span><span class="nv">$0</span><span class="p">)</span> <span class="p">}</span> </code></pre> </div> <div class="declaration"> <h4>Declaration</h4> <div class="language"> <p class="aside-title">Swift</p> <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="n">mapError</span><span class="o"><</span><span class="kt">NewFailure</span><span class="o">></span><span class="p">(</span><span class="n">_</span> <span class="nv">transform</span><span class="p">:</span> <span class="p">(</span><span class="kt">Failure</span><span class="p">)</span> <span class="o">-></span> <span class="kt">NewFailure</span><span class="p">)</span> <span class="o">-></span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">Success</span><span class="p">,</span> <span class="kt">NewFailure</span><span class="o">></span> <span class="k">where</span> <span class="kt">NewFailure</span> <span class="p">:</span> <span class="kt">Error</span></code></pre> </div> </div> <div> <h4>Parameters</h4> <table class="graybox"> <tbody> <tr> <td> <code> <em>transform</em> </code> </td> <td> <div> <p>A closure that takes the error of the instance.</p> </div> </td> </tr> </tbody> </table> </div> <div> <h4>Return Value</h4> <p>A <code>DataResponse</code> instance containing the result of the transform.</p> </div> </section> </div> </li> <li class="item"> <div> <code> <a name="/s:9Alamofire12DataResponseV11tryMapErroryACyxs0F0_pGqd__q_KXEsAERd__lF"></a> <a name="//apple_ref/swift/Method/tryMapError(_:)" class="dashAnchor"></a> <a class="token" href="#/s:9Alamofire12DataResponseV11tryMapErroryACyxs0F0_pGqd__q_KXEsAERd__lF">tryMapError(_:<wbr>)</a> </code> </div> <div class="height-container"> <div class="pointer-container"></div> <section class="section"> <div class="pointer"></div> <div class="abstract"> <p>Evaluates the specified closure when the <code>DataResponse</code> is a failure, passing the unwrapped error as a parameter.</p> <p>Use the <code>tryMapError</code> function with a closure that may throw an error. For example:</p> <pre class="highlight swift"><code><span class="k">let</span> <span class="nv">possibleData</span><span class="p">:</span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">Data</span><span class="o">></span> <span class="o">=</span> <span class="o">...</span> <span class="k">let</span> <span class="nv">possibleObject</span> <span class="o">=</span> <span class="n">possibleData</span><span class="o">.</span><span class="n">tryMapError</span> <span class="p">{</span> <span class="k">try</span> <span class="nf">someFailableFunction</span><span class="p">(</span><span class="nv">taking</span><span class="p">:</span> <span class="nv">$0</span><span class="p">)</span> <span class="p">}</span> </code></pre> </div> <div class="declaration"> <h4>Declaration</h4> <div class="language"> <p class="aside-title">Swift</p> <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="n">tryMapError</span><span class="o"><</span><span class="kt">NewFailure</span><span class="o">></span><span class="p">(</span><span class="n">_</span> <span class="nv">transform</span><span class="p">:</span> <span class="p">(</span><span class="kt">Failure</span><span class="p">)</span> <span class="k">throws</span> <span class="o">-></span> <span class="kt">NewFailure</span><span class="p">)</span> <span class="o">-></span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">Success</span><span class="p">,</span> <span class="kt">Error</span><span class="o">></span> <span class="k">where</span> <span class="kt">NewFailure</span> <span class="p">:</span> <span class="kt">Error</span></code></pre> </div> </div> <div> <h4>Parameters</h4> <table class="graybox"> <tbody> <tr> <td> <code> <em>transform</em> </code> </td> <td> <div> <p>A throwing closure that takes the error of the instance.</p> </div> </td> </tr> </tbody> </table> </div> <div> <h4>Return Value</h4> <p>A <code>DataResponse</code> instance containing the result of the transform.</p> </div> </section> </div> </li> </ul> </div> </div> </section> </article> </div> <section class="footer"> <p>© 2020 <a class="link" href="http://alamofire.org/" target="_blank" rel="external">Alamofire Software Foundation</a>. All rights reserved. (Last updated: 2020-04-04)</p> <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.13.2</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p> </section> </body> </div> </html>