On iOS platform, it will scroll to the selected item when the picker is opened. But on Android platform, the picker can't scroll to the selected item.
In the Android source code, we can see there is a NumberPicker displaying the string value. We need to record the
scrollY when an item is selected so that we can scroll the picker by ScrollBy or ScrollTo method when the picker is open.
NumberPicker is a local variable, we can't get the instance even through Custom Renderers (PickerRenderer). So I have to say, you can't implement this feature by the current API. You could try to create a new issue on GitHub for your feature request:
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