title: How to change the cluster color of google map In Swift 4
body: <p>I implemented it by following <a href="https://developers.google.com/maps/documentation/ios-sdk/utility/marker-clustering" rel="nofollow noreferrer">https://developers.google.com/maps/documentation/ios-sdk/utility/marker-clustering</a>.</p>
  
  <p>However, there is one problem.</p>
  
  <p>I did not know how to control the color and transparency of the cluster marker.</p>
  
  <p>I looked through the search, but I could not understand any other language code, including Object-C.</p>
  
  <pre><code>let iconGenerator = GMUDefaultClusterIconGenerator ()
  let algorithm = GMUNonHierarchicalDistanceBasedAlgorithm ()
  let renderer = GMUDefaultClusterRenderer (mapView: mapView, clusterIconGenerator: iconGenerator)
  </code></pre>
  
  <p>I also found that this can be solved.</p>
  
  <p>I want to get a way to control the border, background color, transparency, and size of the cluster marker (Circle).</p>
  
  <p>Please help me.</p>