DRDhanasekar R Syncfusion Team January 28, 2019 12:31 PM UTC
We have validated the reported issue "SelectedIndex is not getting updated when using custom view in SfSegmentedControl" in iOS. We have confirmed this as defect and created the bug report for the same. The fix will be available in our upcoming 2019 Volume 1 release which is expected to be rolled out by the mid of March 2019.
We have prepared the workaround for achieving your requirement by updating the selected index through tap gesture event for the image. Please have the sample with the code snippet in the below link.