Unbalanced calls to begin/end appearance transitions
You can download the test case.
Launch using the iPhone 6+ simulator.
Rotate to landscape.
Tap the Show Popover button.
Rotate to portrait.
Note the message in the console, which will be something like: “Unbalanced calls to begin/end appearance transitions for <UITableViewController: 0x7fbb02346170>.”
As bugs go, a message isn’t a serious thing. But it could be indicative of a more serious bug, and so it’s worth reporting.
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There’s very little code in the test case. The action is in TableViewController.m, which presents a view controller as a popover with an adaptive presentation style (full-screen).