DataManager.swift

import Foundation
import CoreData
 
class DataManager:NSObject{
 
    // MARK: - Core Data stack
    
    lazy var persistentContainer: NSPersistentContainer = {
        
        let container = NSPersistentContainer(name: "MyDownloadCoreData")
        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
            if let error = error as NSError? {
                
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
        return container
    }()
    
    // MARK: - Core Data Saving support
    
    func saveContext () {
        let context = persistentContainer.viewContext
        if context.hasChanges {
            do {
                try context.save()
            } catch {
                
                let nserror = error as NSError
                fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
            }
        }
    }
}






////////// For saving and retriving 



//            //save coredata
//
//                let context = dataManager.persistentContainer.viewContext
//                let entity = NSEntityDescription.entity(forEntityName: "VideoCapture", in: context)
//                let newVideo = NSManagedObject(entity: entity!, insertInto: context)
//
//                newVideo.setValue("video", forKey: "videoTitle")
//                newVideo.setValue("\(resumeURl!)", forKey: "videoUrl")
//                newVideo.setValue(resumedata, forKey: "resumedData")
//
//                do {
//                    try context.save()
//                    print("database saved")
//                } catch {
//                    print("Failed saving")
//                }
//
 
//fetchh data
 
//                let request = NSFetchRequest<NSFetchRequestResult>(entityName: "VideoCapture")
//                //request.predicate = NSPredicate(format: "videoUrl = %@", "\(resumeURl!)")
//                request.returnsObjectsAsFaults = false
//                do {
//                    let result = try context.fetch(request)
//                    for data in result as! [NSManagedObject] {
//                        print(data.value(forKey: "resumedata") as! Data)
//                    }
//
//                } catch {
//
//                    print("Failed")
//                }