How to store type Color from SwiftUI into CoreData?

Question

I tried to use Transformable type in core data but the Color can not be cast into NSObject. What should I do if I want to store the Color information?

Answer 1

You can use Transformable, although it has to be stored as UIColor and not Color:

The withRootObject is the colour you want to save.

Also keep in mind that myColour should be of type Data:

@NSManaged public var myColour: Data?

Then you can archive the data like the following:

do {
    try obj.myColour = NSKeyedArchiver.archivedData(withRootObject: UIColor.blue, requiringSecureCoding: false)
} catch {
    print(error)
}

Retrieve it using:

func getColour(data: Data) -> Color {
    do {
        return try Color(NSKeyedUnarchiver.unarchivedObject(ofClass: UIColor.self, from: data)!)
    } catch {
        print(error)
    }

    return Color.clear
}

Usage:

Text("This is some blue text.") // we saved it as UIColor.blue earlier.
    .foregroundColor(self.getColour(data: self.data.myColour!))