Upvote:0 

import UIKit

class ViewController: UIViewController {


  @IBOutlet weak var barChartView: BarChartView!

        override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        let months = ["7/23/2016", "7/22/2016", "7/21/2016", "7/20/2016", "7/19/2016", "7/18/2016", "7/17/2016"]
        let unitsSold = [0.0, 0.0, 0.0, 0.0, 20.0, 50.0, 30.0]

        setChart(months, values: unitsSold)

    }


    func setChart(dataPoints: [String], values: [Double]) {

        var dataEntries: [BarChartDataEntry] = []

        for i in 0..<dataPoints.count {
            if !values[i].isZero {
                let dataEntry = BarChartDataEntry(value: values[i], xIndex: i)
                dataEntries.append(dataEntry)
            }
        }

        let chartDataSet = BarChartDataSet(yVals: dataEntries, label: "")
        let chartData = BarChartData(xVals: dataPoints, dataSet: chartDataSet)
        barChartView.data = chartData

        barChartView.leftAxis.enabled = false
        barChartView.descriptionText = ""
        barChartView.xAxis.labelPosition = .Bottom

    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

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