forked from shadowfacts/Tusker
Fix crash due to PencilKit undo manager not being available until viewDidAppear
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2a05b6d326
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@ -80,12 +80,13 @@ class ComposeDrawingViewController: UIViewController {
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updateLayout(for: toolPicker)
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canvasView.becomeFirstResponder()
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}
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override func viewDidAppear(_ animated: Bool) {
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super.viewDidAppear(animated)
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// wait until the next run loop iteration so that the canvas view has become first responder and it's undo manager exists
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DispatchQueue.main.async {
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NotificationCenter.default.addObserver(self, selector: #selector(self.updateUndoRedoButtonState), name: .NSUndoManagerDidUndoChange, object: self.undoManager!)
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NotificationCenter.default.addObserver(self, selector: #selector(self.updateUndoRedoButtonState), name: .NSUndoManagerDidRedoChange, object: self.undoManager!)
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}
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NotificationCenter.default.addObserver(self, selector: #selector(self.updateUndoRedoButtonState), name: .NSUndoManagerDidUndoChange, object: self.undoManager!)
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NotificationCenter.default.addObserver(self, selector: #selector(self.updateUndoRedoButtonState), name: .NSUndoManagerDidRedoChange, object: self.undoManager!)
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}
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func updateLayout(for toolPicker: PKToolPicker) {
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