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ImagePrefetcher.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>ImagePrefetcher Class Reference</title>
<link rel="stylesheet" type="text/css" href="../css/jazzy.css" />
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<a title="ImagePrefetcher Class Reference"></a>
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<p><a href="../index.html">Kingfisher Docs</a> (78% documented)</p>
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ImagePrefetcher Class Reference
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<article class="main-content">
<section>
<section class="section">
<h1>ImagePrefetcher</h1>
<div class="declaration">
<div class="language">
<pre class="highlight"><code><span class="kd">public</span> <span class="kd">class</span> <span class="kt">ImagePrefetcher</span></code></pre>
</div>
</div>
<p><code>ImagePrefetcher</code> represents a downloading manager for requesting many images via URLs, then caching them.
This is useful when you know a list of image resources and want to download them before showing.</p>
</section>
<section class="section task-group-section">
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/s:vC10Kingfisher15ImagePrefetcher22maxConcurrentDownloadsSi"></a>
<a name="//apple_ref/swift/Property/maxConcurrentDownloads" class="dashAnchor"></a>
<a class="token" href="#/s:vC10Kingfisher15ImagePrefetcher22maxConcurrentDownloadsSi">maxConcurrentDownloads</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The maximum concurrent downloads to use when prefetching images. Default is 5.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">maxConcurrentDownloads</span> <span class="o">=</span> <span class="mi">5</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/onevcat/Kingfisher/tree/3.12.2/Sources/ImagePrefetcher.swift#L54">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:FC10Kingfisher15ImagePrefetchercFT4urlsGSaV10Foundation3URL_7optionsGSqGSaOS_25KingfisherOptionsInfoItem__13progressBlockGSqFTGSaPS_8Resource__GSaPS4___GSaPS4____T__17completionHandlerGSqFTGSaPS4___GSaPS4___GSaPS4____T___S0_"></a>
<a name="//apple_ref/swift/Method/init(urls:options:progressBlock:completionHandler:)" class="dashAnchor"></a>
<a class="token" href="#/s:FC10Kingfisher15ImagePrefetchercFT4urlsGSaV10Foundation3URL_7optionsGSqGSaOS_25KingfisherOptionsInfoItem__13progressBlockGSqFTGSaPS_8Resource__GSaPS4___GSaPS4____T__17completionHandlerGSqFTGSaPS4___GSaPS4___GSaPS4____T___S0_">init(urls:options:progressBlock:completionHandler:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Init an image prefetcher with an array of URLs.</p>
<p>The prefetcher should be initiated with a list of prefetching targets. The URLs list is immutable.
After you get a valid <code>ImagePrefetcher</code> object, you could call <code><a href="../Classes/ImagePrefetcher.html#/s:FC10Kingfisher15ImagePrefetcher5startFT_T_">start()</a></code> on it to begin the prefetching process.
The images already cached will be skipped without downloading again.</p>
<div class="aside aside-note">
<p class="aside-title">Note</p>
<p>By default, the <code>ImageDownloader.defaultDownloader</code> and <code>ImageCache.defaultCache</code> will be used as
the downloader and cache target respectively. You can specify another downloader or cache by using a customized <code><a href="../Typealiases.html#/s:10Kingfisher21KingfisherOptionsInfo">KingfisherOptionsInfo</a></code>.
Both the progress and completion block will be invoked in main thread. The <code>CallbackDispatchQueue</code> in <code>optionsInfo</code> will be ignored in this method.</p>
</div>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="kd">public</span> <span class="n">convenience</span> <span class="nf">init</span><span class="p">(</span><span class="nv">urls</span><span class="p">:</span> <span class="p">[</span><span class="kt">URL</span><span class="p">],</span>
<span class="nv">options</span><span class="p">:</span> <span class="kt"><a href="../Typealiases.html#/s:10Kingfisher21KingfisherOptionsInfo">KingfisherOptionsInfo</a></span><span class="p">?</span> <span class="o">=</span> <span class="kc">nil</span><span class="p">,</span>
<span class="nv">progressBlock</span><span class="p">:</span> <span class="kt"><a href="../Typealiases.html#/s:10Kingfisher23PrefetcherProgressBlock">PrefetcherProgressBlock</a></span><span class="p">?</span> <span class="o">=</span> <span class="kc">nil</span><span class="p">,</span>
<span class="nv">completionHandler</span><span class="p">:</span> <span class="kt"><a href="../Typealiases.html#/s:10Kingfisher27PrefetcherCompletionHandler">PrefetcherCompletionHandler</a></span><span class="p">?</span> <span class="o">=</span> <span class="kc">nil</span><span class="p">)</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>urls</em>
</code>
</td>
<td>
<div>
<p>The URLs which should be prefetched.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>options</em>
</code>
</td>
<td>
<div>
<p>A dictionary could control some behaviors. See <code>KingfisherOptionsInfo</code> for more.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>progressBlock</em>
</code>
</td>
<td>
<div>
<p>Called every time an resource is downloaded, skipped or cancelled.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>completionHandler</em>
</code>
</td>
<td>
<div>
<p>Called when the whole prefetching process finished.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>An <code>ImagePrefetcher</code> object.</p>
</div>
<div class="slightly-smaller">
<a href="https://github.com/onevcat/Kingfisher/tree/3.12.2/Sources/ImagePrefetcher.swift#L95-L102">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:FC10Kingfisher15ImagePrefetchercFT9resourcesGSaPS_8Resource__7optionsGSqGSaOS_25KingfisherOptionsInfoItem__13progressBlockGSqFTGSaPS1___GSaPS1___GSaPS1____T__17completionHandlerGSqFTGSaPS1___GSaPS1___GSaPS1____T___S0_"></a>
<a name="//apple_ref/swift/Method/init(resources:options:progressBlock:completionHandler:)" class="dashAnchor"></a>
<a class="token" href="#/s:FC10Kingfisher15ImagePrefetchercFT9resourcesGSaPS_8Resource__7optionsGSqGSaOS_25KingfisherOptionsInfoItem__13progressBlockGSqFTGSaPS1___GSaPS1___GSaPS1____T__17completionHandlerGSqFTGSaPS1___GSaPS1___GSaPS1____T___S0_">init(resources:options:progressBlock:completionHandler:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Init an image prefetcher with an array of resources.</p>
<p>The prefetcher should be initiated with a list of prefetching targets. The resources list is immutable.
After you get a valid <code>ImagePrefetcher</code> object, you could call <code><a href="../Classes/ImagePrefetcher.html#/s:FC10Kingfisher15ImagePrefetcher5startFT_T_">start()</a></code> on it to begin the prefetching process.
The images already cached will be skipped without downloading again.</p>
<div class="aside aside-note">
<p class="aside-title">Note</p>
<p>By default, the <code>ImageDownloader.defaultDownloader</code> and <code>ImageCache.defaultCache</code> will be used as
the downloader and cache target respectively. You can specify another downloader or cache by using a customized <code><a href="../Typealiases.html#/s:10Kingfisher21KingfisherOptionsInfo">KingfisherOptionsInfo</a></code>.
Both the progress and completion block will be invoked in main thread. The <code>CallbackDispatchQueue</code> in <code>optionsInfo</code> will be ignored in this method.</p>
</div>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="nv">resources</span><span class="p">:</span> <span class="p">[</span><span class="kt"><a href="../Protocols/Resource.html">Resource</a></span><span class="p">],</span>
<span class="nv">options</span><span class="p">:</span> <span class="kt"><a href="../Typealiases.html#/s:10Kingfisher21KingfisherOptionsInfo">KingfisherOptionsInfo</a></span><span class="p">?</span> <span class="o">=</span> <span class="kc">nil</span><span class="p">,</span>
<span class="nv">progressBlock</span><span class="p">:</span> <span class="kt"><a href="../Typealiases.html#/s:10Kingfisher23PrefetcherProgressBlock">PrefetcherProgressBlock</a></span><span class="p">?</span> <span class="o">=</span> <span class="kc">nil</span><span class="p">,</span>
<span class="nv">completionHandler</span><span class="p">:</span> <span class="kt"><a href="../Typealiases.html#/s:10Kingfisher27PrefetcherCompletionHandler">PrefetcherCompletionHandler</a></span><span class="p">?</span> <span class="o">=</span> <span class="kc">nil</span><span class="p">)</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>resources</em>
</code>
</td>
<td>
<div>
<p>The resources which should be prefetched. See <code>Resource</code> type for more.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>options</em>
</code>
</td>
<td>
<div>
<p>A dictionary could control some behaviors. See <code>KingfisherOptionsInfo</code> for more.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>progressBlock</em>
</code>
</td>
<td>
<div>
<p>Called every time an resource is downloaded, skipped or cancelled.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>completionHandler</em>
</code>
</td>
<td>
<div>
<p>Called when the whole prefetching process finished.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>An <code>ImagePrefetcher</code> object.</p>
</div>
<div class="slightly-smaller">
<a href="https://github.com/onevcat/Kingfisher/tree/3.12.2/Sources/ImagePrefetcher.swift#L122-L140">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:FC10Kingfisher15ImagePrefetcher5startFT_T_"></a>
<a name="//apple_ref/swift/Method/start()" class="dashAnchor"></a>
<a class="token" href="#/s:FC10Kingfisher15ImagePrefetcher5startFT_T_">start()</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Start to download the resources and cache them. This can be useful for background downloading
of assets that are required for later use in an app. This code will not try and update any UI
with the results of the process.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">start</span><span class="p">()</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/onevcat/Kingfisher/tree/3.12.2/Sources/ImagePrefetcher.swift#L147-L176">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:FC10Kingfisher15ImagePrefetcher4stopFT_T_"></a>
<a name="//apple_ref/swift/Method/stop()" class="dashAnchor"></a>
<a class="token" href="#/s:FC10Kingfisher15ImagePrefetcher4stopFT_T_">stop()</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Stop current downloading progress, and cancel any future prefetching activity that might be occuring.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">stop</span><span class="p">()</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/onevcat/Kingfisher/tree/3.12.2/Sources/ImagePrefetcher.swift#L182-L192">Show on GitHub</a>
</div>
</section>
</div>
</li>
</ul>
</div>
</section>
</section>
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<p>© 2017 <a class="link" href="https://onevcat.com" target="_blank" rel="external">Wei Wang</a>. All rights reserved. (Last updated: 2017-09-02)</p>
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