On iOS 7, the on-screen keyboard (TouchScreenKeyboard) doesn’t get closed after the following steps:

- Open the on-screen keyboard with TouchScreenKeyboard.Open().
- Suspend the app without closing the keyboard.
- Resume the app. Still it has the keyboard.
- Press Done or Cancel button on the input field.

After the steps above are done, it closes the text field, but the keyboard keeps visible and unresponsive.

Note that the issue is not reproducible on iOS 8 and later.