title: ios charts not displaying line/bar in charts
body: <p>I am working on <a href="https://github.com/danielgindi/Charts" rel="nofollow noreferrer">ios-charts</a> by Daniel Gindi on swift 3.0. I have written following code for bar charts</p>
  
  <pre><code>var dataEntries: [BarChartDataEntry] = []
  for i in 0..&lt;dateTime.count {
      let dateFormatter = DateFormatter()
      dateFormatter.dateFormat = "MM/dd/yyyy hh:mm:ss aa"
      let dateObj = dateFormatter.date(from: dateTime[i])
      let timeIntervalForDate = dateObj!.timeIntervalSince1970
      let dataEntry = BarChartDataEntry(x: Double(timeIntervalForDate), y: Double(readings[i]))
      dataEntries.append(dataEntry)
  }
  let chartDataSet = BarChartDataSet(values: dataEntries, label: "Units")
  let chartData = BarChartData(dataSet: chartDataSet)
  self.ChartsView.data = chartData
  </code></pre>
  
  <p>i get following result in emulator:
  <a href="https://i.stack.imgur.com/NeCRe.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NeCRe.png" alt="enter image description here"></a></p>
  
  <p>you can see no red line reflecing my values. I even zoomed to charts but nothing was shown.</p>
  
  <p>I also tried line chart with sample values. Here is the code: </p>
  
  <pre><code>let dollars1 = [20.0, 4.0, 6.0, 3.0, 12.0, 16.0, 4.0, 18.0, 2.0, 4.0, 5.0, 4.0]
  let months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
  var yValues : [ChartDataEntry] = [ChartDataEntry]()
  for i in 0 ..&lt; months.count {
      yValues.append(ChartDataEntry(x: Double(i + 1), y: dollars1[i]))
  }
  let LineData = LineChartData()
  let ds = LineChartDataSet(values: yValues, label: "Months")
  
  LineData.addDataSet(ds)
  self.ChartsView.data = LineData
  </code></pre>
  
  <p>Its result is even more weird. No grid lines are shown either in this chart. Here is the image.</p>
  
  <p>I am not sure what is wrong with these graphs. Am I missing something. So far i am unable to look any furthur as most solutions are using old version of charts(or may be it is something else i am not aware). Please guide me to proper direction. Thanks</p>
  
  <p><a href="https://i.stack.imgur.com/xTPhn.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xTPhn.png" alt="enter image description here"></a></p>