A Code Sample to use Core Data Stack as a Singleton

I used to create an instance of my Core Data Stack in AppDelegate file and accessed it from other View Controllers. But I have to modify it because iOS 11 forces to access AppDelegate file in the main thread. So I made my Core Data Stack as a singleton.

If you are looking for a code sample to make your core data stack as a singleton. Please refer the code below.

class func sharedInstance() -> CoreDataStack {
    struct Static {
        static let instance = CoreDataStack()
    }
    return Static.instance
}

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NSBatchUpdateRequest doesn't support updating relationship in Core Data

NSBatchUpdateRequest allows that you can directly store and modify your records rather than with an object graph.

By the way it seems that it doesn’t support updating or modifying a relationship in a core data.

If you want to learn how to use NSBatchUpdateRequest, here is a great and recent tutorial that I found.

So NSBatchUpdateRequest is essential that you handle with lots of data by using Core Data.

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