CloudKit同步和 Today Extension 的 APP group 冲突

ios 的 extension 使用了APP group 存储数据导致同步数据失败
可以看一下wwdc2019
最后的CoreDataStack代码大概就是下面这样的

import CoreData

class CoreDataStack {
    // MARK: - Core Data stack

    static var persistentContainer: NSPersistentCloudKitContainer = {
        let container = NSPersistentCloudKitContainer(name: "data")
        let storeURL = URL.storeURL(for: "group.com.myapp", databaseName: "data")
        let storeDescription = NSPersistentStoreDescription(url: storeURL)
        storeDescription.cloudKitContainerOptions = NSPersistentCloudKitContainerOptions(containerIdentifier: "iCloud.com.myapp")
        container.persistentStoreDescriptions = [storeDescription]
        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

    static 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)")
            }
        }
    }
}

public extension URL {
    static func storeURL(for appGroup: String, databaseName: String) -> URL {
        guard let fileContainer = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: appGroup) else {
            fatalError("Shared file container could not be created.")
        }

        return fileContainer.appendingPathComponent("\(databaseName).sqlite")
    }
}