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Creating a new iOS project using Core Data and I cannot find the managedObjectModel variable in the AppDelegate

Hi I'm watching the Stanford CS193p iOS 9 Core Data lecture

A new iOS project is created with Core Data and copies the AppDelegate's Core Data part to the other project.

The question is when I create a new project with Core Data it's AppDelegate only has the two methods and a variable (see the screenshot).

Code screenshot

I cannot find the managedObjectModel variable.

Do I have to implement this myself?

I'm using Xcode 8.0

我发现使用persistentContainer.viewContext的swift3

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