iOS: Delete ALL Core Data Swift

Question

I am a little confused as to how to delete all core data in swift. I have created a button with an IBAction linked. On the click of the button I have the follow

Answer 1

In Swift UI

when you select core data at the beginning of project the persistence coordinator is automatically created by swift in app delegate. The scene delegate creates @environmentObject for managed context

let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

let contentView = ContentView().environment(\.managedObjectContext, context)

create instance of manageObjectContext in content view and also fetchRequest object using property wrapper @FetchRequest

@Environment(\.managedObjectContext) var moc
@FetchRequest(entity: EntityName.entity(), sortDescriptors: []) var entityNames: FetchedResults

For delete action perform

for entityName in entityNames {
moc.delete(entityName)
}
try? moc.save()

try operation can throw error so please implement do try catch block in production code to handle error properly.