Is there any event or method to detect that I pressed the ipad's default hide keyboard button?
You can use these notifications:
UIKeyboardWillHideNotification - Posted immediately prior to the dismissal of the keyboard.
UIKeyboardWillHideNotification
UIKeyboardDidHideNotification - Posted immediately after the dismissal of the keyboard.
UIKeyboardDidHideNotification
Source: Managing the Keyboard
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You can use these notifications:
UIKeyboardWillHideNotification- Posted immediately prior to the dismissal of the keyboard.UIKeyboardDidHideNotification- Posted immediately after the dismissal of the keyboard.Source: Managing the Keyboard