Lag during scroll

[Dbigshooter]

I've just implemented the library in a tableview, but I experience pretty heavy lagging during scrolling, when my charts hold a lot of data.

I have a method inside the ChartTableViewCell where I draw the chart based on the data I pass and call from my viewcontroller.

func updateCell() {
        let dataSet = LineChartDataSet(values: entries, label: chartLabel)
        dataSet.drawCirclesEnabled = false
        dataSet.lineWidth = 2
        dataSet.mode = .cubicBezier
        dataSet.drawValuesEnabled = false
        
        let lineChartData = LineChartData(dataSets: [dataSet])
        
        // SET DATA AND RELOAD
        chartView.data = lineChartData
        chartView.fitScreen()
    }

In my tableViewController I call the function after parsing the data:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        
        let meta = chartMetas[indexPath.row]
        let cell = tableView.dequeueReusableCell(withIdentifier: "chartCell", for: indexPath) as! ChartTableViewCell
        cell.readings = currentReadings
        cell.updateCell()
        
        return cell
    }
    

What did I miss? Since the view is lagging so hard when scrolling.

[jjatie]

Charts aren't designed to work well in reusable views. My recommendation would be to render all of your Charts off screen, and grab images of them to place in your table view cell.

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