@WillBishop Thanks for finding a solution to this problem.
I just wanted to add the "Redo" method in case everyone else need it:
self.undoManager?.groupsByEvent = false
self.drawing.strokes.append(YOURCUSTOMPKSTROKE)
for (index, _) in self.drawing.strokes.enumerated() {
self.undoManager?.beginUndoGrouping()
self.undoManager?.registerUndo(withTarget: self, handler: {
$0.drawing.strokes.remove(at: index)
self.undoManager?.registerUndo(withTarget: self, handler: { // redo here
$0.drawing.strokes.append(YOURCUSTOMPKSTROKE)
})
})
self.undoManager?.endUndoGrouping()
}
self.undoManager?.groupsByEvent = true
vuhotan
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