shouldRasterize on CALayer breaks iOS 7 UINavigationBar background blur

Question

I'm doing some 3D transforms on a UINavigationController. In an attempt to increase performance and create prettier rendering (antialiased edges and content), I'm trying out -[CALayer shouldRasterize]. When enabling this on the view that UINavigationBar is contained in, the blur is removed, resulting in a broken look.

Is this simply a limitation of the underlying _UIBackdropView or does anyone know a way to work around this?

With myNavigationController.view.layer.shouldRasterize = NO:

With myNavigationController.view.layer.shouldRasterize = YES:

Answer 1

I still haven't found a way to properly handle this with -[CALayer shouldRasterize]. I did, however, succeed in creating a cached version of the view using the new iOS 7 method -[UIView snapshotViewAfterScreenUpdates:]