Xamarin.forms: iOS Frame IsClippedToBounds broken [Bug]

[taublast]

Description

After upgrading from Forms from 4.6.0.726 to 4.6.0.967
frames on iOS stopped clipping content, tested with a grid inside.

Edit: Last good version checked 4.6.0.847 is okay.

Steps to Reproduce

<frame    CornerRadius="something"     IsClippedToBounds="True">
    <grid>
    <image/><or whatever/>
    </grid>
<frame>

Please kindly check here:
https://forums.xamarin.com/discussion/comment/414472

Expected Behavior

frame to clip content while IsClippedToBounds="True"

Actual Behavior

Not clipping content while IsClippedToBounds="True"

Basic Information

• Version with issue: Forms 4.6.0.967
• Last known good version: 4.6.0.847
• IDE: VS 2019 16.6.2
• Platform Target Frameworks:
  
  
  
  • iOS: latest.. no idea where to check the version when developing from windows
  
  

Screenshots

Reproduction Link

https://forums.xamarin.com/discussion/comment/414472 confirmed by xamarin staff, LeonLu.

Workaround

credits to LeonLu

```
[assembly: ExportRenderer(typeof(Frame), typeof(FrameFix))]
namespace Your.iOS.Renderers
{
protected override void OnElementChanged(ElementChangedEventArgs e)
{
base.OnElementChanged(e);

        if (e.OldElement != null && Control != null)
        {
            Control.PropertyChanged -= OnControlPropertyChanged;
        }

        if (e.NewElement!=null && NativeView != null)
        {
            Control = e.NewElement;
            Control.PropertyChanged += OnControlPropertyChanged;

            UpdateCorners();
        }
    }

    protected void UpdateCorners()
    {
        NativeView.Layer.AllowsEdgeAntialiasing = true;
        NativeView.Layer.MasksToBounds = Control.IsClippedToBounds;
        NativeView.Layer.CornerRadius = Control.CornerRadius;
    }

    private void OnControlPropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        if (NativeView == null || Control == null)
            return;

        if (e.PropertyName == "IsClippedToBounds" 
            || e.PropertyName == "CornerRadius")
        {
            UpdateCorners();
        }
    }
}

```

[Codelisk]

Already solved in nightly build version Xamarin.Forms nighly build 4.8.0.908

[MSiccDev]

Just adding that UWP also works, it is really only iOS.

[thisisthekap]

Is this one going to be fixed on 4.6.0?

[knasher]

I've just upgraded to 4.7.1080 and this behaviour is still happening; the release notes mentioned there was a fix for #11031

[samhouts]

closed by #11129