I have tried to apply some of the learnings from prior chapters to sheets and I am having trouble using an undo manager in sheets. My thinking was to have an undo for setting the die call;
private dynamic var rolls: Int = 10 {
willSet {
let undo: NSUndoManager = undoManager!
..... more undo code
}
}
But the trouble is that “fatal error: unexpectedly found nil while unwrapping an Optional value” when running code, relating to unwrapping undoManager
Is it possible to use undo manager within a sheet?
Thanks
Paul