title: How to use custom implementation of doubleTap Gesture in ios-charts
body: <p>I am building a statistics section of my app and for that reason i use the wonderful ios-charts library. After i finished all my work, i wanted to add a feature where when the user doubleTaps on one bar of the chart, then it switches to another chart, containing that data visualized in another way.</p>
  <p>But the problem is that the library uses the doubleTap gesture for zoom only. So i cannot add my own, because it would conflict, and i cannot change the handler, because the function is private. (and i really don't want to change the source code)</p>
  <p>And after researching on their GitHub i found, that you can use your own gesture if you subclass the chartView.</p>
  <p>My question is, how should i solve this problem? I tried the subclassing, but couldn't get the variables and funcs i needed, i tried overriding, but that gave me an error message stating that this variable/function does not exist in the superclass.</p>
  <p>I would appreciate some help with code examples so that i can learn how to do it the right way.</p>