Bug 40656 - iOS WebView Rotation, Sizing and Scaling issues
Summary: iOS WebView Rotation, Sizing and Scaling issues
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 2.2.0
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2016-04-24 01:04 UTC by Adam
Modified: 2016-04-24 14:09 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Adam 2016-04-24 01:04:15 UTC
This is a regression that started happening in 2.2.0, in 2.1.0 this all works as expected

1 - Rotate the webview once and of course due to the never getting out of IN_PROGRESS bug report: https://bugzilla.xamarin.com/show_bug.cgi?id=30047 it doesn't give the correct height. But by doing this you could essentially fix it if you had it full screen (which I did)

   public override void LayoutSubviews()

        CGRect bounds = UIScreen.MainScreen.Bounds;
        bounds.Height = NativeView.Bounds.Height;

        NativeView.Bounds = bounds;

This now no longer works.

2 - Do a rotate to landscape, then back to portrait and the width of the WebView is half the screen.

3 - Go away from the WebView, then go back to the page, then rotate and you get this exception (everytime)

System.ObjectDisposedException: Cannot access a disposed object.

Object name: 'WebViewRenderer'.
Of course if I do this it stops the error

  protected override void Dispose(bool disposing)
           // base.Dispose(disposing);

But it looks like the WebViewRenderer shouldn't be disposed at that point until the actual page or control is disposed of.

This was all done on an iPhone 4S and 6 simulators on iOS 9.2
Comment 1 Adam 2016-04-24 01:20:16 UTC
Forgot to add that the first time you view a webpage in the WebView the content inside it also hasn't scaled properly and is larger than usual. A move to another page (ContentPage) and then back to the ContentPage with a WebView, it will then scale the content to the correct height.
Comment 2 Rui Marinho 2016-04-24 14:09:34 UTC
Should be fixed in 2.2.0-pre5