ios - how to set xAxis label to show dates with interval of 1 day or week using charts? Also issue when showing yAxis value -

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my code bar chart shown below: 

    override func viewdidload() {         super.viewdidload()          ibviewgarph.delegate = self          months = ["jan", "feb", "mar", "apr", "may", "jun", "jul", "aug", "sep", "oct", "nov", "dec"]         let unitssold = [1200.0, 1400.0, 600.0, 3500.0, 1200.0, 1600.0, 1400.0, 1800.0, 1200.0, 1400.0, 1500.0, 1400.0]          setchart(months, values: unitssold)     } func setchart(datapoints: [string], values: [double]) {          ibviewgarph.leftaxis.axisminvalue = 500         ibviewgarph.leftaxis.axismaxvalue = 3500          var dataentries: [barchartdataentry] = []          in 0..<datapoints.count {             let dataentry = barchartdataentry(value: values[i], xindex: i)             dataentries.append(dataentry)         }          let chartdataset = barchartdataset(yvals: dataentries, label: "units sold")         let chartdata = barchartdata(xvals: months, dataset: chartdataset)          ibviewgarph.data = chartdata         ibviewgarph.descriptiontext = ""         chartdataset.colors = [uicolor(red: 230/255, green: 126/255, blue: 34/255, alpha: 1)]         ibviewgarph.xaxis.labelposition = .bottom         ibviewgarph.rightaxis.drawlabelsenabled = false         ibviewgarph.animate(xaxisduration: 2.0, yaxisduration: 2.0)      }

issue can see image , yaxis showing 2 lines , dont know issue , want set xaxis labels show dates ex: "28/8/2016" interval of 1 day or 1 week , how pass custom labels xaxis same have done yaxis? may similar question :chart - controlling axis interval, spacing , visibility dont know work around question have put numbers image


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