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If you override the "SetFrameSize" method of NSView, the "height" field of the newSize argument is always 0 (the actual height is lost), thus your view won't render since it's resulting height is 0.
This is a new bug in the 1.12.x version of Xamarin.Mac (I just upgraded to 18.104.22.168), as this had been working in previous versions of Xamarin.Mac and MonoMac before that.
I have attached a sample to reproduce the problem. The "CustomView" class in the sample overrides "SetFrameSize", and thus the view doesn't render. If you comment out that method you'll see the view get's it's frame set correctly, and with then render correctly.
This method is useful to only invalidate portions of the view during a live resize, and while I can work around the issue in the short term, it has performance implications for me.
Created attachment 10442 [details]
Test case to reproduce the issue.
There is a 64-bit specific marshaling bug that you've run into. Please install this version of Xamarin.Mac:
and rebuild. That should fix the problem.
Sorry for the trouble. It is already fixed in the next version of Xamarin.Mac.
I have downloaded the fixed build from the link provided in the comment 2 and tried to verify this issue . But I observed that on running the attached sample, getting exception and application quit unexpectedly. Please refer the screencast: http://www.screencast.com/t/vSMTAoQyP83r
Build Info: https://gist.github.com/Rajneesh360Logica/385e95495a700e601bd7
Application Output: https://gist.github.com/Rajneesh360Logica/b1d7b6745b67a4237b57
Please please let me know what I am missing to check this issue ?
Could you retest with the latest cycle 5 build? Maybe test on 10.10 machine to compare? I'm seeing both that build and cycle 5 both work.
As an FYI, that build fixed the issue for me.
Awesome Jon, good to know.
Just FYI - Rajneesh is part of our awesome QA group who goes behind resolved bugs and validates the fix really still works so we don't regress on a fix we think is in. There was some confusion on which upcoming build has the fix I sent you.
As per @Jon comment 5 this issue has been fixed and working fine .
Hence I am closing this issue.