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In previous versions of Xamarin.Forms, you could set Upside Down as a supported orientation in Info.plist, and the screen would correctly rotate. In the latest version, this is no longer the case. I believe it's a result of this pull request: https://github.com/xamarin/Xamarin.Forms/pull/147
To fix this, I had to implement a custom renderer and override GetSupportedInterfaceOrientations. This behaviour should be supported without the use of a custom render as it was in previous versions of Xamarin.Forms.
To reproduce this issue, you just need to create a new Xamarin.Forms solution, and add UIInterfaceOrientationPortraitUpsideDown to the supported orientations in Info.plist of the iOS project. On version 126.96.36.199, the screen will not rotate when upside down.
Closing as invalid as I didn't realize that implementation of SupportedInterfaceOrientations was also required in native Obj-C and Swift.