Hi Hau,
Thanks for using Syncfusion Product.
We have checked the reported query “SfListView Re-ordering not working on Xamarin.Forms.IOS” from our side. Unfortunately the reported issue does not reproduced form our end. We have checked the sample with latest SfListview(16.3.0.21) and XF version(3.2**) in.net std, OnDragIndicator and OnHold works while dragging. Can you please share the details if you are getting this issue in any specific devices alone. We have attached the tested sample in below link and please find the sample from below.
Can you please check above sample whether the issue occurs in our sample also, if no then please revert us back with modified sample or full xaml page if you have loaded listview along with view like pulltorefresh or any other in sample which will help us to analyze the methods you implemented in sample better and provide appropriate solution from our end.
Regards,
Jayaleshwari N