How do you enable touch interaction in Core Plot?

Has anyone tried to add touch interaction to CorePlot?

I'm trying to implement custom layer to be able to draw a line on the chart which will show specific value and will draw itself in specified location when user touches chart area,开发者_开发技巧 but I'm not having any luck.

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You can enable interaction by changing the allowsuserinteraction property.

[[graph defaultPlotSpace] setAllowsUserInteraction:TRUE];