ReferenceFileDocument DOES NOT saving!

Question

Created Aug ’20

Replies 3

Boosts 0

Views 1.6k

Participants 3

The reference file document does not trigger any save action upon objectWillChange, assuming this is what trigger the write mechanism.

I've tested both using a simple String as the Snopshot type. As well as my production document model which is an ObservableObject.

Is it a bug? Or can Apple engineer provide a working example using ReferenceFileDocument?

version: XCode 12 beta 6

Answered by FrankZR in 634269022

Recently, I've received feedback via the bug report and been suggested to register an undo.
Turnout, the update of ReferenceFileDocument can be triggered, just like UIDocument, by registering an undo action. The difference is that the DocumentGroup explicitly setup the UndoManager via the Environment.

For example,

Code Block @main
struct RefDocApp: App {
    var body: some Scene {
        DocumentGroup(newDocument: {
            RefDocDocument()
        }) { file in
            ContentView(document: file.document)
        }
    }
}
struct ContentView: View {
    @Environment(\.undoManager) var undoManager
    
    @ObservedObject var document: RefDocDocument
    var body: some View {
        TextEditor(text: Binding(get: {
            document.text
        }, set: {
            document.text = $0
            undoManager?.registerUndo(withTarget: document, handler: {
                print($0, "undo")
            })
        }))
    }
}

Boost

Answer 1

Philip Mobil OP

Sep ’20

Same problem here using Xcode12 beta6

1

Answer 2

timtimmy OP

Sep ’20

Same on Xcode12 beta 6 and iPadOS 14 beta 8.

0

Answer 3

FrankZR OP

Sep ’20

Accepted Answer

Recently, I've received feedback via the bug report and been suggested to register an undo.
Turnout, the update of ReferenceFileDocument can be triggered, just like UIDocument, by registering an undo action. The difference is that the DocumentGroup explicitly setup the UndoManager via the Environment.

For example,

Code Block @main
struct RefDocApp: App {
    var body: some Scene {
        DocumentGroup(newDocument: {
            RefDocDocument()
        }) { file in
            ContentView(document: file.document)
        }
    }
}
struct ContentView: View {
    @Environment(\.undoManager) var undoManager
    
    @ObservedObject var document: RefDocDocument
    var body: some View {
        TextEditor(text: Binding(get: {
            document.text
        }, set: {
            document.text = $0
            undoManager?.registerUndo(withTarget: document, handler: {
                print($0, "undo")
            })
        }))
    }
}

0