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How to Zoom and Pan to thow last 20 candles

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I have a chart with 300 holc data. So I got 300 candles.

But I want show tha last 20 candles to the user when the view is created. And then user can zoom and pan to see more data by finger.

 

We have implement this feature with android version.

How can I do that with ios version?

Thank you very much.


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