Invalidate method missing

[adamstener]

This repo leaves the documentation up to the Android version of Charts, which is very similar, but with dynamic data or data refreshing, the Android repo says to call invalidate on the chart. There is no such method on this repo. How does one refresh the graph after modifying the data or dataset? Calling notify does not seem to do the trick.

[roxanajula]

I was wondering the same, I have this issue on IOS charts: #2854 On Android it seems to be working fine and the only thing that is different in the code is the invalidate() function on Android. I also tried chartView.notifyDataSetChanged() and chartView.data.notifyDataChanged() but they don't seems to have the same effect as invalidate() has on Android.

[adamstener]

I have the graph updating by adding the new item(s) to the dataSet, then calling these 3 methods.

DataSet.notifyDataSetChanged()
Data.notifyDataChanged()
Chart.notifyDataSetChanged()

[andrealufino]

As a workaround you could call chart.animate(xAxisDuration: 0.05) that redraws the chart (not in the correct way I guess).

[alum]

Solution by @adamstener works. As a matter of fact, only Chart.notifyDataSetChanged() is needed. However, I am updating the data by looping over the DataSet and doing something like:

let y = someMethodToGetNewDataPoint()
let entry = dataSet.entryForIndex(i)
entry?.y = y

[liuxuan30]

Data.notifyDataChanged() includes DataSet.notifyDataSetChanged() I think, because notifyDataSetChanged calls calcMinMax while Data.notifyDataChanged() will loop the data set to call it anyway.

But I found one improve here is not to loop all the time.

[dxshindeo]

Chart.notifyDataSetChanged() did the trick for me. My problem was that sometimes legends would go outside the chart, even though the wrapping was enabled. This fixed it.

[ghost]

Ok, what worked me – I just cleared the array before adding new entries.

dataEntries.removeAll()