gistfile1.txt

func backgroundLoad(){
        
        
        if let coord = self.stack.context.persistentStoreCoordinator{
            
            
            let bckgContext = NSManagedObjectContext(concurrencyType: .PrivateQueueConcurrencyType)
            
            bckgContext.persistentStoreCoordinator = coord
            
            
            // This will run in the background
            bckgContext.performBlock(){
                
                for i in 1..<100{
                    let nb = Notebook(name: "New notebook \(i)", context: bckgContext)
                    for j in 1..<100{
                        let note = Note(text: "Type something \(j)", context: bckgContext)
                        note.notebook = nb
                    }
                
                }
            }
        }