Added block callback for prev/next changes #6
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I added a block callback that fires whenever the Next/Previous buttons are pressed, in order to get XCDFormInputAccessoryView to play nice with TPKeyboardAvoiding.
I found that I could press Next until the active text field was way offscreen, and needed to fire TPKeyboardAvoiding's
-scrollToActiveTextFieldmethod to move it into the visible area.If there's already an easy way to do this I totally missed it...but this callback might be useful for other things as well.