title: iOS Charts zoom into a range of values
body: <p>Is it possible to set the chart zoom to a range of values within the dataset? So currently we have a chart that can display close to 100 values within it. What we're trying to achieve is the ability to zoom into a range of values i.e. The first 12 values within the dataset and then the user is able to scroll in either direction to see the remaining values within the chart.</p>
  
  <p>We've currently tried using the <code>setVisibleXRangeMaximum</code> function but that only seems to display the first value within the chart rather than 12. And this may be because the data that we receive from he service can be unpredictable i.e. one value may be 1000 and the next maybe 100,000.</p>