How can i check if data is successfully stored in coredata, next time when i launch an app ? - iOS Swift

Question

i have successfully fetched data through api and stored them in coredata. Now next time when user launches an app i want to check if there is local data available then i want to load local data, not server data.

Answer 1

You should apply two things for fulfilling your scenario.

1) First Fetch Data from CoreData.

let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Users")
        request.returnsObjectsAsFaults = false
        do {
            let result = try context.fetch(request)
            for data in result as! [NSManagedObject] {
               print(data.value(forKey: "username") as! String)
          }

        } catch {

            print("Failed")
        }

if result is available then Don't need to call API.

2)If Fetched Result is nil Call the API and Save Data Into CoreData