What would be the normal radio button replacement on iOS?
A table with only one row that can be checked ( MobileTableCellData.AccessoryTypes.Checkmark) at a time maybe?
It really depends on your design. You could also use a MobileSegmentedButton
This is what I created for one of my apps.
Each table cell uses a custom cell and only one item can be selected at once
Great ideas @Jeremie_L thank you