Changing the frame of an inputAccessoryView in iOS 8

Question

Long time lurker - first time poster!

I am having an issue while recreating a bar with a UITextView like WhatsApp does it.

I am using a custom <

Answer 1

Unfortunately, iOS8 adds a private height constraint to the inputAccessoryView, and this constraint is not public.

I recommend recreating the accessory view when its frame should change, and call reloadInputViews so that the new one is installed.

This is what I do, and it works as expected.

Answer 2

I've been banging my head against the wall on this one for quite some time, as the behavior changed from iOS 7 to iOS 8. I tried everything, until the most obvious solution of all worked for me:

inputAccessoryView.autoresizingMask = UIViewAutoresizingFlexibleHeight;

duh!

Answer 3

Here's a complete, self-contained solution (thanks @JohnnyC and @JoãoNunes for pointing me in the right direction, @stigi for explaining how to animate intrinsicContent changes):

class InputAccessoryView: UIView {

    // InputAccessoryView is instantiated from nib, but it's not a requirement
    override func awakeFromNib() {
        super.awakeFromNib()        
        autoresizingMask = .FlexibleHeight
    }

    override func intrinsicContentSize() -> CGSize {
        let exactHeight = // calculate exact height of your view here
        return CGSize(width: UIViewNoIntrinsicMetric, height: exactHeight)
    }

    func somethingDidHappen() {
        // invalidate intrinsic content size, animate superview layout        
        UIView.animateWithDuration(0.2) {
            self.invalidateIntrinsicContentSize()
            self.superview?.setNeedsLayout()
            self.superview?.layoutIfNeeded()
        }
    }
}