How to highlight cirlce in Show touch coords example? about swiftcharts

[owlmafia]

Yes, it's correct, you only have to add circleView.setNeedsDisplay() after the color changes. In order to clear the selection you can use the same approach from AreasExample, just store the last selection in a variable and reset the colors when you select a new one.

[owlmafia]

I think you can adjust the circleViewGenerator to handle the touches itself. You can pass a touchHandler block to ChartPointEllipseView. In this handler you would have access to ChartPointEllipseView to change its colors. Then you also don't need the touchViewsGenerator.

I'm not sure if the tap area of ChartPointEllipseView will be sufficient, if not you could return a HandlingView in circleViewGenerator (instead of ChartPointEllipseView) with a slightly bigger area than the circles. You would add then ChartPointEllipseView as a subview of this bigger view.

[christinalau]

Thanks, can you share the snippet of code? I tried to add circleView.touchHandler to the circleViewGenerator, but it does not get call at all. Thanks again...

[owlmafia]

Did you inspect the view hierarchy? Maybe there's something on top of the views consuming the touch. Maybe it also needs to set userInteractionEnabled. If this doesn't help please post your code to find the problem.

[christinalau]

The userInteractionEnabled seems to solve the original problem, now the touchHandler is called. However, I am unable to change the color:

let circleViewGenerator = {(chartPointModel: ChartPointLayerModel, layer: ChartPointsLayer, chart: Chart) -> UIView? in

        let circleView = ChartPointEllipseView(center: chartPointModel.screenLoc, diameter: 24)

        circleView.touchHandler = {
            print("@@@@ **** touch circle..")
            circleView.fillColor = UIColor.redColor()
            circleView.borderColor = UIColor.greenColor()
            circleView.animDuration = 1.5

        }
        circleView.userInteractionEnabled = true
        circleView.animDuration = 1.5
        circleView.fillColor = UIColor.whiteColor()
        circleView.borderWidth = 5
        circleView.borderColor = UIColor.blueColor()

        return circleView
    }

Is this correct or am I missing something? Thanks... I also need a way to clear the previous selection and is uncertain about the approach...

[christinalau]

Thanks, works perfectly 👍

[owlmafia]

You're welcome!