Specifying HeightRequest in Webview when wrapped by ScrollView set "invisible" causes crash in iOS

[bobwhitten]

Description

e.g., Add this to MAUI template project:

            <ScrollView x:Name="myMediaFrame" 
                IsVisible="False"
                >
                <WebView x:Name="myWebView" 
                    HeightRequest="1000"
                    />
            </ScrollView>

This results in this on startup (in my app, when the page appeared):

ObjCRuntime.ObjCException
Message=Objective-C exception thrown. Name: CALayerInvalidGeometry Reason: CALayer position contains NaN: [22 nan]. Layer: <CALayer:0x30034e780; position = CGPoint (0 0); bounds = CGRect (0 0; 0 0); delegate = <Microsoft_Maui_Platform_MauiWKWebView: 0x11640b000; frame = (0 0; 0 0); backgroundColor = UIExtendedGrayColorSpace 0 0; layer = <CALayer: 0x30034e780>>; sublayers = (<CALayer: 0x300376cc0>); allowsGroupOpacity = YES; backgroundColor = <CGColor 0x30266d9a0> [<CGColorSpace 0x30211e580> (kCGColorSpaceICCBased; kCGColorSpaceModelMonochrome; Generic Gray Gamma 2.2 Profile; extended range)] ( 0 0 )>

Removing EITHER IsVisible="False" from VerticalStackLayout OR HeightRequest="1000" from WebView prevents crash.

This behavior did not happen in Windows.
This particular behaviour does not slow me down, but it was certainly unexpected, and took some time to find.

Steps to Reproduce

Run reproduction project. Observe crash.
Modify as noted above, observe no crash.

Link to public reproduction project repository

https://github.com/bobwhitten/DemoWebView

Version with bug

9.0.21 SR2.1

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

iOS

Affected platform versions

iPadOS 18.2, 17.5.1

Did you find any workaround?

Either do not start Invisible, or do not set height request.

Relevant log output

[Ying-6]

Since the project linked by the user cannot be opened, I used the MAUI template project and verified this issue with Visual Studio 17.13.0 Preview 2.1 (9.0.21 & 9.0.14 & 8.0.100). Can repro this issue on iOS platform.

MauiApp9.zip

[bobwhitten]

Apologies, the GitHub proj was private. It is now public. Thanks to Ying-6 for pointing this out.

[PureWeen]

I'm curious if this will be resolved by
#26763