CODEWITHSUNDEEP
datepickerswiftui
Jeremy
Jeremy

Reputation: 3

Is there a way to set a starting DatePicker value from CoreData?

I have a simple application that has a date component that gets saved to core data. I've set up a view to allow for editing, but when this edit view loads, my date picker always shows the current date, not the date previously entered when the item was created.

I tried using onAppear() to set the date value, and this does work. I load the edit view and the DatePicker shows the stored date as I would like it to. However, if I wish to make a change to the picker, Xcode throws an alert stating "Modifying state during view update, this will cause undefined behavior." I'm not sure how I set this value and not cause and issue with state. 

var thisCook: CookData
@State var updatedDate = Date()


DatePicker(selection: $updatedDate) {
                        Text("Cook Date:")
                    }.onAppear() {
                        self.updatedDate = self.thisCook.date
                        //Alert is shown for the line above
                    }

I'm not sure exactly what code will be helpful here, but this is where my issue arrises. If I need to show more, let me know. As I said before, this does load the edit view with the previously saved date, but if I wish to enter that date, I get the modifying state alert.

Upvotes: 0

Views: 293

Answers (1)

Fabian
Fabian

Reputation: 5358

You are assigning the current date with @State var updatedDate = Date(), that's why it shows that. Inside init you can also assign theCook.date to _updatedDate.

To avoid Modifying state during view update it possibly helps to move the state into an ObservableObject.

Upvotes: 0

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