title: Draw two or more markers at same time (library Charts)
body: <p>How can I display two or more markers on a graph at the same time?</p>
  <p>This is part of my code for this task</p>
  <pre class="lang-swift prettyprint-override"><code>chartView.data = LineChartData(dataSets: [dataSet, dataSetForecast, dataSetUpper, dataSetLower])
  let upperHigh = Highlight(x: (dataSetUpper.xMax + dataSetUpper.xMin) / 2,
                            y: dataSetUpper.yMax, dataSetIndex: 2)
  upperHigh.dataIndex =  2
  let lowerHigh = Highlight(x: (dataSetLower.xMax + dataSetLower.xMin) / 2,
                            y: dataSetLower.yMax, dataSetIndex: 3)
  lowerHigh.dataIndex = 3
  let forecastHigh = Highlight(x: (dataSetForecast.xMax + dataSetForecast.xMin) / 2,
                               y: dataSetForecast.yMax, dataSetIndex: 1)
  forecastHigh.dataIndex = 1
  
  chartView.highlightValues([upperHigh, lowerHigh, forecastHigh])
  chartView.drawMarkers = true
  chartView.data?.highlightEnabled = true
  chartView.notifyDataSetChanged()
  chartView.setVisibleXRangeMaximum(3600 * 3)
  chartView.setVisibleXRangeMinimum(0)
  </code></pre>
  <p>Library <a href="https://github.com/danielgindi/Charts" rel="nofollow noreferrer">https://github.com/danielgindi/Charts</a></p>