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Code

    let managedObjectContext =
        (UIApplication.sharedApplication.delegate
            as! AppDelegate).managedObjectContext

Error:

  • Value of type AppDelegate has no member managedObjectContext,

My problem is I want to use managedObjectContext in Xcode 8, but it says AppDelegate have no such member. I want to use this because i want to create a project for ios 9 with core data. I want the definition of managedObjectContext,please comment if you have

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Vikrant Singh
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    when you created the project have you checked `use core data` ? or it was unchecked ? – Ketan Parmar May 17 '17 at 12:38
  • I think you need to refer [http://stackoverflow.com/questions/2032818/adding-core-data-to-existing-iphone-project](http://stackoverflow.com/questions/2032818/adding-core-data-to-existing-iphone-project) – Ketan Parmar May 17 '17 at 12:42
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    yes i checked it,the problem is i am creating a project for ios 9, and xcode 8 is creating appdelegate file with core data compatible with ios 10. – Vikrant Singh May 17 '17 at 12:43
  • it adds persistentContainer: NSPersistentContainer which is not compatible with ios 9 – Vikrant Singh May 17 '17 at 12:44
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    There's an answer on SO that includes class source for the older style of Core Data access, but converted to Swift 3: http://stackoverflow.com/questions/38120937/xcode-8-core-data-template-for-ios-8-9/39814217#39814217 – Phillip Mills May 17 '17 at 12:47
  • then [http://stackoverflow.com/questions/38140188/is-it-possible-to-use-core-data-xcode-8-and-swift-3-0-with-both-ios-9-and-10](http://stackoverflow.com/questions/38140188/is-it-possible-to-use-core-data-xcode-8-and-swift-3-0-with-both-ios-9-and-10) this one may help you! – Ketan Parmar May 17 '17 at 12:50
  • Thanks for your answer,may be it will work , but i want to know where i will put the name of my ".xcdatamodelId" in managedObjectContext to make connection with my data model. – Vikrant Singh May 17 '17 at 13:06

2 Answers2

-1

Explanation:

  • Error is quite clear, it states that AppDelegate doesn't have a property called managedObjectContext. Check AppDelegate and see if a property with the name managedObjectContext exists.

Reference:

It is very important to learn the following before writing code:

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user1046037
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  • i understand the error but i want the definition of managedObjectContext which i found now. – Vikrant Singh May 17 '17 at 13:24
  • Refer to the 1st link, it is time consuming to read but will help you understand clearly. ManagedObjectContext is like a scratch pad where you can make changes. Then later you can save the context. – user1046037 May 17 '17 at 13:25
-1

You need to just create a project with tick mark of "Use Core Data" and it will available in app delegate of you project.image of project creation and selection of use core data tick mark

    lazy var persistentContainer: NSPersistentContainer = {
    /*
     The persistent container for the application. This implementation
     creates and returns a container, having loaded the store for the
     application to it. This property is optional since there are legitimate
     error conditions that could cause the creation of the store to fail.
    */
    let container = NSPersistentContainer(name: "temp")
    container.loadPersistentStores(completionHandler: { (storeDescription, error) in
        if let error = error as NSError? {
            // Replace this implementation with code to handle the error appropriately.
            // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.

            /*
             Typical reasons for an error here include:
             * The parent directory does not exist, cannot be created, or disallows writing.
             * The persistent store is not accessible, due to permissions or data protection when the device is locked.
             * The device is out of space.
             * The store could not be migrated to the current model version.
             Check the error message to determine what the actual problem was.
             */
            fatalError("Unresolved error \(error), \(error.userInfo)")
        }
    })
    return container
}()

Use in app delegate

let context = persistentContainer.viewContext
Vivek Lathiya
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