App Crashing while updating BarChart with data

[sulaiman-mlbd]

What did you do?

I wanted to show a bar chart. while configuring bar chart with data , my app get crashing
my code was
func updateBarChart() {

    let entry1 = BarChartDataEntry(x: 1.0, y: 10)
    let entry2 = BarChartDataEntry(x: 2.0, y: 20)
    let entry3 = BarChartDataEntry(x: 3.0, y: 30)
    let dataSet = BarChartDataSet([entry1, entry2, entry3])
    let data = BarChartData(dataSets: [dataSet])
    barChart.data = data
    //        barChart.chartDescription?.text = "Number of Widgets by Type”

    dataSet.colors = ChartColorTemplates.vordiplom()

    barChart.notifyDataSetChanged()
}

It was crashing on library part . I am adding details about where it crashed.
FileName: BarChartRenderer.swift
Line 79:
full library function code;
open override func initBuffers()
{
if let barData = dataProvider?.barData
{
// Matche buffers count to dataset count
if _buffers.count != barData.dataSetCount
{
while _buffers.count < barData.dataSetCount
{
_buffers.append(Buffer())
}
while _buffers.count > barData.dataSetCount
{
_buffers.removeLast()
}
}

        for i in stride(from: 0, to: barData.dataSetCount, by: 1)
        {
            **let set = barData.dataSets[i] as! IBarChartDataSet** // crashing on this line
            let size = set.entryCount * (set.isStacked ? set.stackSize : 1)
            if _buffers[i].rects.count != size
            {
                _buffers[i].rects = [CGRect](repeating: CGRect(), count: size)
            }
        }
    }
    else
    {
        _buffers.removeAll()
    }
}

What did you expect to happen?

This code was taken from your dummy project. It ran perfectly before. Now i don't know why crashing

Charts Environment

Charts version/Branch/Commit Number:
Xcode version: 10.2 updated
Swift version: 4.2
Platform(s) running Charts: iPhone XR emulator
macOS version running Xcode: mac OS Mojave

[simbo64]

Have you tried cleaning the build folder and then re-building? I had an issue where the new code hadn't built properly

[scjc]

I fixed this issue with a clean build (Cmd + Shift + K)

[anekk]

Duplicate of #3917

[liuxuan30]

Post the crash log.
from your code

let dataSet = BarChartDataSet([entry1, entry2, entry3])

it shouldn't fail to cast. So I need the crash message of the reason. your screenshot includes almost everything but the crash message.

Unlike #3917, it's crashed because it's passing in a ChartDataSet rather than a BarChartDataSet.

However you are saying you passed in BarChartDataSet. so it's why the crash message matters here. I don't know why it's crashed.

The ChartsDemo works fine though.

[liuxuan30]

take a look at #3917, we found something that may causes the crash. closing as dup

[aksamitsah]

hi, i get issue i dont get any error during build when i run my app than runtime crash