SOLVED: Picker from CoreData Object

@Benji HWS+

Aug '22

Hi all,

I'm having an issue with a picker. I managed to get all data shown in the picker (here: project.petsArray) but I can't select them.

Most topics found only refer to the usual picker with a given (string) array like

var colors = ["Blue", "Green", "Red"]

I think it got to do with my "project.petsArray" not being an array of strings, right?

Projects is my parent Entity with a one-to-many relationship pointing to the Pets Entity. I've created my petsArray as an extension to Projects to use elsewhere in my app:

 public var petsArray: [Pets] {
        let set = pets as? Set<Pets> ?? []
        return set.sorted {
            $0.wrappedPetName < $1.wrappedPetName
        }
    }

Here is my Picker:

 Picker("Pet", selection: $stdPet) {
                    ForEach(project.petsArray, id: \.self) { pet in
                        Text(pet.wrappedPetName)
                    }
                }

I thought of converting my petsArray to an Array of Strings to see if that helps but I can't wrap my head around how to do that right now. Is there anything else anyone can think of that may work?

Many thanks in Advance!

@roosterboy HWS+

Aug '22

You don't show enough of your View to really tell what's going on, unfortunately.

One thought:

stdPet is probably set up as an @State property. But Pets, being a Core Data entity, is a class. @State is intended for use with value types, not reference types like classes. It doesn't always work correctly if you try using it with a class.

The other thing that comes to mind is: what is the type of stdPet? It needs to be the same type as the tag used for each of the Views inside your ForEach. Since you don't explicitly assign a tag, the default is to use the item's id, which you have indicated should be self. This means the type of the tag is a Pets instance.

I thought of converting my petsArray to an Array of Strings to see if that helps but I can't wrap my head around how to do that right now.

You can do this:

public var petsArray: [Pets] {
    let set = pets as? Set<Pets> ?? []
    return set.map { $0.wrappedPetName }
              .sorted(by: <)
}

Sponsor Hacking with Swift and reach the world's largest Swift community!

Archived topic

This topic has been closed due to inactivity, so you can't reply. Please create a new topic if you need to.

All interactions here are governed by our code of conduct.