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Summary:
If the previous keyboard is a custom keyboard from a keyboard extension, setting the inputView of a UITextField/UITextView to the view of a UIViewController will have the custom keyboard prevent the custom inputView from appearing. UIView hierarchy analysis shows that the view is resized to a negative y origin and 0 width.

However, just using a regular view that wasn't created in the loadView method of the UIViewController will not cause issues. You will however lose view events.

Steps to Reproduce:
0. Run "TheInputView" Project.
1. Tap the text field at the bottom of the screen to expand and show the keyboard.
2. Switch to a custom keyboard.
3. Tap the "UIView" button; You should successfully switch to an Orange view where the custom keyboard previously should be. This is correct.
4. Tap the "View Controller's view" button; Purple view appears momentarily before the custom keyboard takes over. This is wrong.

Expected Results:
The purple view should appear where the custom keyboard previously was and remain.

Actual Results:
Purple view appears momentarily before the custom keyboard takes over.

Version:
iOS 8.x

Notes:
This works correctly in anything prior to iOS 8.

Configuration:
All iPhones

Attachments:
'TheInputView.zip' was successfully uploaded.