iphone - iOS Keyboard Location and Orientation

Question

I'm relatively new to iOS SDK, and I'm experiencing a very bizarre issue regarding the device keyboard location and orientation for an app I'm working on. The problem is that if the keyboard is open while the user multi-tasks or the app goes into background, after the user comes back to the app, the keyboard will be be displaced (with UIKeyboardWillChangeFrameNotification being raised), but in an incorrect orientation and location.

Sometimes the keyboard shows up completely off the screen too, which is completely undesired behaviour.

My questions are:

1. What is the position and orientation of the keyboard dependant on? How is it controlled by iOS?

2. Is there a way to detect when the keyboard is being displayed off-screen regardless of the device type and screen size? I'm thinking it would be doable by tracking UIKeyboardWillChangeFrameNotification or UIKeyboardWillShowNotification.

3. How would I reset/set the location and orientation of the keyboard prior to displaying it? Is this even possible?

Answer 1

From the documentation:

Use the keys described in “Keyboard Notification User Info Keys” to get the location and size of the keyboard from the userInfo dictionary.

Keys used to get values from the user information dictionary of keyboard notifications:

NSString * const UIKeyboardFrameBeginUserInfoKey;
NSString * const UIKeyboardFrameEndUserInfoKey;
NSString * const UIKeyboardAnimationDurationUserInfoKey;
NSString * const UIKeyboardAnimationCurveUserInfoKey;