[Bug] [iOS] Rendering Line shape crashes the app when building using iOS SDK 15.2

[activa]

Description

When using iOS SDK 15.2 (with Xcode 13.2), any Xamarin Forms app that uses Line shapes crashes immediately when the line is rendered.

Steps to Reproduce

1. Add a Line shape in XAML (or in code)
2. Compile using iOS SDK 15.2
3. Run app

For example, this page will crash the app:

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="XFLineBug.MainPage">

    <Grid>
        <Line X1="10" Y1="10" X2="100" Y2="50" Stroke="Red" StrokeThickness="3"/>
    </Grid>

</ContentPage>

Exception thrown: Could not initialize an instance of the type 'CoreGraphics.CGPath': handle is null.

Repro project: XFLineBug.zip
(this is a clean new Xamarin Forms iOS project with the MainPage changed to show a line shape)

Expected Behavior

Line is shown on screen

Actual Behavior

App crashes immediately.

100% reproducible

Basic Information

• Version with issue: 5.0.0.2125 and 5.0.0.2291 (possibly earlier versions as well)
• Last known good version: unknown
• Platform Target Frameworks:
  • iOS: 15.2 (Xamarin.iOS 15.4.0)
  • Android: N/A
  • UWP: N/A
• Android Support Library / AndroidX Version: N/A
• Affected Devices: all iOS devices

Environment

Visual Studio 2022 on Windows
Visual Studio 2019 with Xamarin.iOS 15.4.0, Xcode 13.2 and iOS SDK 15.2 installed on Mac agent

[DoubleDBE]

Can confirm, having the same issue. Same environment as OP.

[NiknakSi]

Seeing this issue as well using Visual Studio for Mac on macOS. VS 8.10.16 (build 2), Xamarin.iOS 15.4.0.0, Xcode 13.2 (13C90), XF 5.0.0.2125 or 5.0.0.2291. Will fail on physical device or simulator, tested on iOS 14.5 and 15.2.

[adamzucchi]

Can also confirm.

[robintschroeder]

Confirmed. Please fix!

[activa]

@jsuarezruiz Can this be looked into ASAP? It's a crippling bug that needs to be addressed immediately. Anyone using Line shapes in an iOS app is no longer able to build and run the app - at all!
There's no workaround other than going back to Xcode 13.1 or earlier (if that's even possible)

[activa]

Stack trace:

Exception : Could not initialize an instance of the type 'CoreGraphics.CGPath': handle is null.
It is possible to ignore this condition by setting ObjCRuntime.Class.ThrowOnInitFailure to false.

at ObjCRuntime.DisposableObject.InitializeHandle (System.IntPtr handle, System.Boolean verify) [0x0003e] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/ObjCRuntime/DisposableObject.cs:85
at ObjCRuntime.DisposableObject..ctor (System.IntPtr handle, System.Boolean owns, System.Boolean verify) [0x00006] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/ObjCRuntime/DisposableObject.cs:51
at CoreFoundation.NativeObject..ctor (System.IntPtr handle, System.Boolean owns, System.Boolean verify) [0x00000] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/CoreFoundation/NativeObject.cs:46
at CoreFoundation.NativeObject..ctor (System.IntPtr handle, System.Boolean owns) [0x00000] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/CoreFoundation/NativeObject.cs:41
at CoreGraphics.CGPath..ctor (System.IntPtr handle, System.Boolean owns) [0x00000] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/CoreGraphics/CGPath.cs:109
at CoreGraphics.CGPath.MakeMutable (System.IntPtr source, System.Boolean owns) [0x0000f] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/CoreGraphics/CGPath.cs:518
at CoreGraphics.CGPath.CopyByTransformingPath (CoreGraphics.CGAffineTransform transform) [0x00000] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/CoreGraphics/CGPath.cs:573
at Xamarin.Forms.Platform.iOS.ShapeLayer.BuildRenderPath () [0x003de] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Shapes\ShapeRenderer.cs:449
at Xamarin.Forms.Platform.iOS.ShapeLayer.UpdatePathStrokeBounds () [0x0004a] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Shapes\ShapeRenderer.cs:584
at Xamarin.Forms.Platform.iOS.ShapeLayer.UpdateShape (CoreGraphics.CGPath path) [0x00034] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Shapes\ShapeRenderer.cs:289
at Xamarin.Forms.Platform.iOS.LineView.UpdateShape () [0x0002a] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Shapes\LineRenderer.cs:106
at Xamarin.Forms.Platform.iOS.LineView.UpdateX1 (System.Double x1) [0x0000c] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Shapes\LineRenderer.cs:80
at Xamarin.Forms.Platform.iOS.LineRenderer.UpdateX1 () [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Shapes\LineRenderer.cs:54
at Xamarin.Forms.Platform.iOS.LineRenderer.OnElementChanged (Xamarin.Forms.Platform.iOS.ElementChangedEventArgs`1[TElement] args) [0x0002a] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Shapes\LineRenderer.cs:31
at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00172] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:296
at Xamarin.Forms.Platform.iOS.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:158
at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00032] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:240

[cfzdevelop]

Having similar error. I have a LaunchStoryboard as splash screen. The splash screen will be shown. But the app doesn‘t change to main window. This is happening since update to latest XF (*.2291) and XCode 15.2.

[matt-uib]

We see the same error here since we updated to Xcode 13.2 and Visual Studio for Mac 8.10.

[jfversluis]

Seems like something changed on the Apple side of this API... I think I got a fix, testing a couple of other scenarios as we speak!