SwiftUI and undo

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Created 5d

Replies 2

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In my multiplatform SwiftUI document app, where should I implement undo? In the Views with Forms and Lists, Bindings, data classes or somewhere else? I am now implementing undo in Bindings and Lists, but I'm wondering if that's the right way to do it.

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Answer 1

DTS Engineer OP

Apple

4d

Undo and redo operations are implemented in SwiftUI TextEditors and TextFields by default.

If you want to manage these actions:

See UndoManager https://developer.apple.com/documentation/foundation/undomanager

For your multi-platform app, SwiftUI has an environment value for that: .undoManager. https://developer.apple.com/documentation/swiftui/environmentvalues/undomanager

Here's an example of .undoManager used to disable Undo.

struct ContentView: View {
 
    @Environment(\.undoManager) var undoManager: UndoManager?
 
    var body: some View {
        VStack {
            TextEditor(text: $text)
        }
        .task {
            undoManager?.disableUndoRegistration()
        }
    }
}

If you still have questions, feel free to provide more information here.

 Travis

0

Answer 2

Willemien OP

3d

Thanks for your answer, but I some problems:

When I edit TextField 1 and then select TextField 2, undo on TextField 1 doesn't work.
Undo after some editing sometimes throws an exception or crashes.
Selecting a TextField registers an undo.

and questions:

Where should I implement undo with a Toggle, Picker or List (move, delete)?
Is it possible to disable the built-in TextField undo and implement my own?

0