How to detect keyboard frame changes when dismiss the keyboard interactively?

Question

Consider this scenario, I have a textview with keyboard Dismiss interactively set in storyboard, so when user scroll down and able to dismiss keyboard interactively. I have constraints on the textview to bottom to make sure it is always fully displayed on the view.

Current problem is, when user gradually scroll down to dismiss the keyboard, I can not detect the keyboard frame changes. I tried UIKeyboardWillHideNotification and UIKeyboardWillChangeFrameNotification, they were only called after the keyboard dismissed.

So my question is, how can we detect keyboard frame changes simultaneously when dismiss the keyboard interactively?

Answer 1

If you want to observe keyboard frame changes even when the keyboard is being dragged you can use this: https://github.com/brynbodayle/BABFrameObservingInputAccessoryView

Basically you create a placeholder input view for keyboard (which sticks to the keyboard all the time, even while dragging) and you observe it's frame changes. Those changes are being returned in a block, so you get current frame of the keyboard all the time.

Answer 2

You shouldn't change the textView height to fit all view. Instead - you should change contentInset field so your textView will stay the same height and you won't have to bother about tracking frame of the interactive keyboard. See answer here: How do I scroll the UIScrollView when the keyboard appears?