inessential by Brent Simmons

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).