Unable to change UIInputView height

Question

I have a simple UIInputViewController subclass with only two overridden methods. I use this input view controller as inputAccessoryViewController on my UIViewContro

Answer 1

When you make a view the input accessory view of a UITextView, as soon as the text view becomes first responder, a height constraint is added automatically set to whatever was sent as the frame height. For example:

let inputView = UIInputView(frame: CGRectMake(0, 0, view.bounds.width, 200), 
    inputViewStyle: .Default)
someTextView.inputAccessoryView = inputView
someTextView.becomeFirstResponder()
assert((inputView.constraints().last as NSLayoutConstraint).constant == 200)

You can modify this constraint after the fact.