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Fix crash due to PencilKit undo manager not being available until viewDidAppear

This commit is contained in:
Shadowfacts 2021-06-10 10:33:24 -04:00
parent 2a05b6d326
commit 7c9287543c
1 changed files with 6 additions and 5 deletions
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11
Tusker/Screens/Compose/ComposeDrawingViewController.swift
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@ -80,12 +80,13 @@ class ComposeDrawingViewController: UIViewController {
updateLayout(for: toolPicker)
canvasView.becomeFirstResponder()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
// wait until the next run loop iteration so that the canvas view has become first responder and it's undo manager exists
DispatchQueue.main.async {
NotificationCenter.default.addObserver(self, selector: #selector(self.updateUndoRedoButtonState), name: .NSUndoManagerDidUndoChange, object: self.undoManager!)
NotificationCenter.default.addObserver(self, selector: #selector(self.updateUndoRedoButtonState), name: .NSUndoManagerDidRedoChange, object: self.undoManager!)
}
NotificationCenter.default.addObserver(self, selector: #selector(self.updateUndoRedoButtonState), name: .NSUndoManagerDidUndoChange, object: self.undoManager!)
NotificationCenter.default.addObserver(self, selector: #selector(self.updateUndoRedoButtonState), name: .NSUndoManagerDidRedoChange, object: self.undoManager!)
}
func updateLayout(for toolPicker: PKToolPicker) {