Working on Day 57 and trying to save the list of Wizards. It says to make some changes to my SceneDelegate.swift file, but I don't have one. Is this something I'm supposed to create or is that a file added by an older version of Xcode?

Using Xcode 12.4 on Mac OS 10.15.7.

Based on the note at the end of Day 58, the one-to-many lesson, I'm guessing the question I have above is no longer relevant. Looks like it may have been fixed in a version of Xcode after these tutorials were written.

Actually,I find the solution by myself,this is the best solution!!!!!!!

@Environment(\.managedObjectContext) var moc1

@FetchRequest(entity:Wizard.entity(),sortDescriptors:[]) var mywizard:FetchedResults<Wizard>

    func add1(){
        let movename1="天天"
        let wizard=Wizard(context: self.moc1)
        wizard.name=movename1

    }
    func save(){

           if  self.moc1.hasChanges {

               do{
                   moc1.mergePolicy=NSMergePolicy.mergeByPropertyObjectTrump
                   try self.moc1.save()

               }catch{
                   print("it cannot be saved")
               }
           }
    }