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On WinPhone and Android, the WebView control re-sizes automatically (within a ContentPage) if the device changes orientation. However, on iOS the re-size does not happen. The behaviour should be consistent across the different platforms, with the re-sizing happening.
We'd be happy to help you resolve this issue. Please help us by attaching a reduced reproduction to the bug by starting with a clean Xamarin.Forms project and adding just the code necessary to demonstrate the issue. If you'd do this for us we would very much appreciate it. If you are able to reproduce the issue without modifying the platform specific projects that would eliminate a number of possibilities and likely expedite a resolution.
Xamarin Forms Team
The Forms Gallery sample demonstrates this problem - just select WebView from the menu when running it on iOS.
I am building both the Forms Gallery sample and my own app (which also shows the problem) using Xamarin.Forms version 188.8.131.5259
I have checked this issue with Xamarin.Forms 1.4.3 and observed that WebView does not resize on iOS when change orientation. To reproduce this issue I have followed FormsGallery sample.
ZipXam Log: https://gist.github.com/Parmendrak/61a5c6cdaaeb68f45396
Microsoft Visual Studio Professional 2013
Version 12.0.30723.00 Update 3
Microsoft .NET Framework
Installed Version: Professional
Xamarin 3.11.666.0 (ebae43a)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android 184.108.40.206 (5f55a9ef61c11b6ce0890bc91e4c71b1b92be214)
Visual Studio plugin to enable development for Xamarin.Android.
Xamarin.Forms Intellisense 1.0
Provides intellisense for Xamarin.Forms in the XML editor.
Xamarin.iOS 220.127.116.11 (67b390d0d1bd741582cf7b7fd3ffea08583a3f83)
Visual Studio extension to enable development for Xamarin.iOS.
Xamarin.iOS Unified Migration 1.0
Automated migration for Xamarin iOS Classic projects to Unified
Early preview of Xamarin Test Cloud integration
I am also experiencing this issue.
*** This bug has been marked as a duplicate of bug 30047 ***