Index out of bounds exception in v3.2 in createAccessibleElement

[simonbengtsson]

After updating to charts 3.2 I started getting Fatal error: Index out of range in the new BarChartRenderer#createAccessibleElement():809. It seems this code dataSet.stackLabels[idx % stackSize] makes stackLabels required?

My workaround for now is to always specify stackLabels. Can be done with something like this:

let dataSet = BarChartDataSet(values: entries, label: nil)
dataSet.stackLabels = [String](repeating: "", count: dataSet.stackSize)

Charts Environment

Charts version: 3.2
Xcode version: 10
Swift version: 4.2
Platform: iOS
macOS: 10.13.6

[liuxuan30]

@petester42 may have answer who's responsible for checking the bound for accessibility

[Talgat777]

+1

1 | Charts | createAccessibleElement (ChartViewBase.swift:47)
2 | Charts | createAccessibleElement (:809)
3 | Charts | drawDataSet (HorizontalBarChartRenderer.swift:280)
4 | Charts | drawData (BarChartRenderer.swift:253)
5 | Charts | draw (BarLineChartViewBase.swift:231)

[AflyingApple]

I also encountered the same problem.

[nathantannar4]

+1

[igzrobertoestrada]

I found this issue too

[nathantannar4]

@simonbengtsson's workaround still fails for me

_{Sent with GitHawk}

[pmairoldi]

I believe I've fixed the issue but we should not allow setting colours/stackLabels individually. There are too many cases where they won't be of the some size but they should be. @liuxuan30, @danielgindi what do you guys think?

[pmairoldi]

I've fixed the crashes but I found some accessibility issue with our current implementation. The fix will take a little longer

[JuhaO81]

We are also facing same issues. Any estimates on fix release?

[pmairoldi]

Problably the end of the week. I’ll see if I have time tomorrow. Please keep in mind that we are all just volunteering our time here.

[Scalman]

Hi, im still getting this error when using stacked bar chart. I can provide you with code if it is necessary!

Error:
Thread 1: Fatal error: Index out of range

Where
elementValueText = dataSet.valueFormatter?.stringForValue(
vals[idx % stackSize], <-- HERE
entry: e,
dataSetIndex: dataSetIndex,
viewPortHandler: viewPortHandler) ?? "(e.y)"

Charts Environment
Charts version: 3.2.1
Xcode version: 10
Swift version: 4.2
Platform: iOS
macOS: 10.14

[pmairoldi]

Some sample code to reproduce the issue would be welcomed. Thanks.