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Created attachment 9040 [details]
I'm using the Position X property to get and set the position of a horizontal scrollbar, like is done in the Forms.Labs.ExtendedScrollbar except in horizontal mode. It does work ok in vertical mode. I am attaching a simple one-page project that demonstrates this, there is a flag vert, which can switch the scroller mode to demonstrate. Behavior confirmed by Jon Douglas in support 11 Dec. (Thanks Jon)
I have tried to reproduce this issue and getting the same behavior. The Position X property to get and set the position of a horizontal scroll bar is not working. However this is working fine in vertical mode.
IDE log: https://gist.github.com/sunil360/b5a2ec10d90dcd6a380e
Debug Output: https://gist.github.com/sunil360/52642ee53b30f05224cd
Device log: https://gist.github.com/sunil360/bf61844abf6ae6380110
Microsoft Visual Studio Professional 2013
Version 12.0.31101.00 Update 4
Microsoft .NET Framework
Xamarin 220.127.116.11 (a6d269d)
Xamarin.Android 18.104.22.168 (49a04b966feb40dfdba49d57ba16249b66d606a6)
Xamarin.iOS 22.214.171.124 (43e3b715220b50914b45bec675e19008ff50682a)
The child of the ScrollViewRenderer provides the horizontal scrolling and not the ScrollViewRenderer itself. This should help you achieve what you want.
I believe the problem is in the Position.X property of the ScrollView, and also in the ScrollTo function when setting a horizontal scrolling position. I am not sure what you mean by the child of the ScrollViewRender providing the scrolling