Open Radar

 
Summary:
After an app returns from the background, a fullscreen UIView's hitTest:withEvent method will fire for touches that should be going to the on screen keyboard.

Steps to Reproduce:
- Subclass UIView as MyView and override hitTest:withEvent: to log when it is called.
- Create an app with 2 views:
  - 1 Fullscreen MyView (768x1024)
  - 1 UITextView (200x200) in the center of the MyView, as a subview

- Launch the app.
- Tap the textfield.
  - You will see hitTest logged the touch event. The textfield became first responder and the keyboard appeared.  Tapping elsewhere in the fullscreen view will log similar events.
- Tap on the keyboard.
  - You will see that hitTest does not log these touch events. Characters appear in the textfield.
- Dimiss the keyboard.
- Send the app to the background.
- Resume the app.
- Tap the textview to make it first responder.
  - You will see hitTest logged the touch event. The textfield became first responder and the keyboard appeared.
- Tap on the keyboard.
  - You will see that now hitTest DOES log these touch events. Characters appear in the textfield.

Expected Results:
MyView's hitTest should be called consistently for touches to the keyboard whether the app has been in the background or not.

Actual Results:
MyView's hitTest is called inconsistently.

Regression:
Unsure, see notes.

Notes:
I haven't been able to test this on earlier versions of iOS.  This behavior is only apparent on device so I could not reproduce it in earlier versions of the simulator.