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The iOS chard does not support gesture recognizers. If you are not going to use any other chart gestures (pan, zoom, tap for selection) then you can disable all chart gestures and add a gesture recognizer to the chart parent. I have attached a sample project for demonstration. Please, note that the iOS chart renderer has to be modified to disable the native chart gestures, see CustomChartRenderer class in the sample.
I hope this helps.
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