Status bar could not find cached time string image. Rendering in-process

Question

I get the above runtime message after I upgraded to Swift4.1 and Xcode 9.3. Before the upgrade I did not have this message in my console window.

Status ba

Answer 1

I am also seeing this warning appear, and in answer to Question 1, I am also seeing potentially very nasty behaviour associated with it.

Running something close to a basic sample animated triangle Metal app, but with

renderPassDescriptor.colorAttachments[0].loadAction = .load

such that the frame isn't cleared every frame. What seems to be happening is that every other time the warning message is logged, iOS also gets some part of its management of graphics state confused so that I witness a violent flashing of parts of the image (which then goes away again later).

How likely this situation would be to emerge in a 'real' app I'm not sure, but it's definitely not something you want users to end up seeing.

I haven't fixed the problem here thus far; 'Hide status bar' and 'Requires full screen' settings don't help.