title: SDWebImage checking if image cached using Swift: Ambiguous Reference
body: <p>I am trying to find out if an image has already been cached using SDWebImage but when I try to use this method I get the error "Ambiguous reference to member 'cachedIageExistsForURL".  </p>
  
  <pre><code>let bool = SDWebImageManager.cachedImageExistsForURL(imgURL)
  </code></pre>
  
  <p>I am using Swift and I have a bridging header to use the library.</p>