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在Core Data中實現(xiàn)和管理用戶驅動的數(shù)據(jù)撤銷和恢復操作需要遵循以下步驟:
let managedContext = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType)
managedContext.undoManager = NSUndoManager()
managedContext.undoManager?.beginUndoGrouping()
// Perform data changes here
managedContext.undoManager?.endUndoGrouping()
managedContext.undoManager?.undo()
managedContext.undoManager?.redo()
NotificationCenter.default.addObserver(self, selector: #selector(undoManagerDidUndo), name: .NSUndoManagerDidUndoChange, object: managedContext.undoManager)
NotificationCenter.default.addObserver(self, selector: #selector(undoManagerDidRedo), name: .NSUndoManagerDidRedoChange, object: managedContext.undoManager)
@objc func undoManagerDidUndo() {
// Update UI elements to reflect the undo state
}
@objc func undoManagerDidRedo() {
// Update UI elements to reflect the redo state
}
通過遵循以上步驟,在Core Data中實現(xiàn)和管理用戶驅動的數(shù)據(jù)撤銷和恢復操作可以提供更好的用戶體驗,并增加用戶的工作效率。
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