We are not able to reproduce the issue “PdfViewer stops execution while loading PDF document in iOS device”. We have tried to reproduce the issue in iPad Air 2 with iOS version 10.2. Kindly provide the following details.
1. The device you used
2. iOS version of the device
3. The PDF document you have used (if possible)
4. Version of PdfViewer
5. Xamarin.Forms version you are using
These details will help us to investigate more into the reported issue and assist you better.