UndoProvider.md

ENUM

UndoProvider

Register undo and redo actions.

An example implementation with a view model:

class ViewModel: ObservableObject {
  @Published var text: String = "" {
      didSet {
          UndoProvider.registerUndo(withTarget: self, set: { $0.text = oldValue })
      }
  }
}

Methods

registerUndo(withTarget:undoManager:set:)

Registers the undo and redo actions. Thanks to Matthaus Woolard for the article "Handling undo & redo in SwiftUI".

• Parameters:
  • target: The target object, usually the observable object with the property.
  • undoManager: If you do not want to use the key window's undo manager, specify one here.
  • set: The closure that assigns the old value to the property.