UndoManager — Swift

The Undo Manager in Swift is a mechanism used for managing undo and redo operations in an application. It allows users to revert changes made to a document or data if desired. The undo manager tracks changes made to a document or data and allows users to undo or redo those changes. It can be used in iOS, macOS, and other Apple platforms for implementing undo and redo functionality in applications. The Undo Manager is part of the Foundation framework in the Swift standard library and can be easily used in any Swift project.

Here’s an example of how you can use an undo manager in Swift:

// create an undo manager
let undoManager = UndoManager()

// register an undo operation
undoManager.registerUndo(withTarget: self) { [weak self] in
    self?.textField.text = "Old Text"
}

// perform a change
textField.text = "New Text"

// check if undo is possible
if undoManager.canUndo {
    // perform undo
    undoManager.undo()
    
    // check if redo is possible
    if undoManager.canRedo {
        // perform redo
        undoManager.redo()
    }
}