[Bug] Xamarin.Forms 4.5 breaks custom frame renderer shadow functionality on iOS

[doriangh]

Description

When making a custom frame renderer for iOS and changing the shadow properties, they do not get applied on Xamarin 4.5. Moreover, the custom renderer does not extend, but rather overwrite the Xamarin Forms implementation.

Steps to Reproduce

1. Make a new Xamarin Forms project
2. Create a custom frame renderer
3. Modify the shadow of the custom frame renderer

Expected Behavior

The custom frame renderer extends the properties of the current frame, modifying only the shadow.

Actual Behavior

The custom frame renderer does not affect the shadow, sets the default shadow.

Basic Information

• Version with issue: 4.5.0.356
• Last known good version: 4.4.0.991757
• IDE: Visual Studio for Mac
• Nuget Packages: Xamarin.Forms, Xamarin.Essentials
• Affected Devices: iOS

Screenshots

How it should look:

How it looks in Xamarin.Forms 4.5

Reproduction Link

https://github.com/doriangh/Xamarin-Forms-4.5-issue

[hartez]

Duplicate of #9265

[ashleypringle]

We're also experiencing this problem. Reverting to Forms version 4.4.0.991265 fixed the issue.

[samhouts]

closed by #10023

[doriangh]

@samhouts I still can't get this to work with the exact setup in the latest XF 4.5 sr4 (4.5.0.617).

[liveinvarun]

@samhouts This issue is still happening in 4.5.0.617 and pre versions too. Can you confirm which version has the fix and also reopen the ticket.

[cheles]

it's still present in XF 4.6.0.726