Hello,
I have the same issue. When I am trying to change the sashColor of WKUserNotificationInterfaceController in WatchOS 9.0 by overriding the sashColor property of the controller, it seems that this does not work for WatchOS 9, but this still works on WatchOS (< 9.0). Also, I made some research and can not find a way how to change the background colour of the content area of the long-look notification view? It seems that there is no backgroundColor (or related...) property to be overridden in the WKUserNotificationInterfaceController. Do you have any solutions or advices? Thanks in advance!
oistanchev
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