In our application we are using UIAlertViewController. When accessibility full keyboard access is enabled, and we are trying to dismiss that AlertViewController with Esc key from external keyboard that is not working. We are presenting AlertViewController as a popover. We need dismiss the AlertViewController with Esc key press from external keyboard.
Our engineering teams need to investigate this issue, as resolution may involve changes to Apple's software. Please file a bug report, include a small Xcode project and some directions that can be used to reproduce the problem, and post the FB number here once you do. If you post the bug number here I'll check the status next time I do a sweep of forums posts where I've suggested bug reports.
Bug Reporting: How and Why? has tips on creating your bug report.