If opened in insert mode, nothing responds to touch.
If opened in update mode, everything responds fine even if all data is cleared.
Can't see any blocking views.
Can manually set title as first responder but tapping away (keyboard closes) causes everything to go dead again. Cannot restore title as first responder on touch.
Seems to have been introduced by iOS 11.2 (confirmed everything works find with iOS 10)
ChannelEditViewController