Snap to position for x values (paging)

[humanootc]

• I've read, understood, and done my best to follow the *CONTRIBUTING guidelines.

What did you do?

I have created a draggable LineChartView (only on the xAxis). I have been trying to have a snap to position (chart should automatically snap to the closest x value to center when scrolling ends) functionality similar to UICollectionView with paging enabled.
Tried implementing the chartViewDidEndPanning delegate method and using highestVisibleX to somehow get the value closest to center but it doesn't behave as expected when scrolling fast.
Is there a better way to achieve this functionality?

func chartViewDidEndPanning(_ chartView: ChartViewBase) {
        let highestVisibleX = lineChartView.highestVisibleX.rounded()
        lineChartView.centerViewToAnimated(xValue: highestVisibleX - 1, yValue: 0, axis: .left, duration: 0.33)
    }

Charts Environment

Charts version/Branch/Commit Number: 3.3.0 / master
Xcode version: 10.2.1
Swift version: 5
Platform(s) running Charts: iOS
macOS version running Xcode: 10.14.5

[liuxuan30]

ask on stack overflow for such questions plz.

[ivarvanwooning]

I managed to fix this issue myself by using DispatchQueue and a delay of 0.75 seconds. The downside of this is that the update is only triggered after 0.75 seconds; the upside is that it is accurate.

func chartViewDidEndPanning(_ chartView: ChartViewBase) { // when panning is stopped, print lowest and highest visible X DispatchQueue.main.asyncAfter(deadline: .now() + 0.75) { [self] in print(parent.chartView.lowestVisibleX.rounded()) print(parent.lineChart.highestVisibleX.rounded()) } }

[aaronsheah]

am looking to implement something similar any chance @ivarvanwooning could post an example? 🙏