title: How to add Strings on Left Axis in iOS-charts?
body: <p>I am using this code for config left axis:  </p>
  
  <pre><code>let leftAxis = chartView.leftAxis
  leftAxis.removeAllLimitLines()
  leftAxis.gridLineDashLengths = [5, 5]
  leftAxis.drawLimitLinesBehindDataEnabled = true
  leftAxis.labelTextColor = .white
  leftAxis.axisMinimum = 0
  leftAxis.drawLabelsEnabled = true
  let array = ["a","b","c","e","f","g","h"]
  leftAxis.valueFormatter = IndexAxisValueFormatter(values: array)
  leftAxis.granularity = 1
  </code></pre>
  
  <p>Why not show my labels in left axis iOS Swift?</p>