Three-finger undo gesture with custom undo manger
问题 I'm trying to handle the three-finger gesture with a custom undo manager. Using the default undo manager provided by the window, resolved via the UIResponder chain works flawlessly. As soon as I try to use an own undo manager in a view controller I run into issues. (Background: I want to switch between different managers depending on the state of the view, so I can't use the single undo manager provided by the window.) What I did: override undoManager in my view controller and return an own