iOS-Extensions-access-CoreData-shared-folder-and-CloudKit.md

iOS Extensions access CoreData, shared folder and CloudKit

1. applicationDocumentsDirectory needs to point to a group directory.

   public lazy var applicationDocumentsDirectory: URL? = {
      return FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.com.xxx.xxxxxx");
   }()

2. sqlite file is required to put in a group folder

   let coordinator = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
      let url = self.applicationDocumentsDirectory?.appendingPathComponent("xxxxx.sqlite")

3. CKContainer is created with a identifier and extensions must share this identifier in targets capabilities settings.

   container = CKContainer(identifier: "iCloud.com.xxx.xxxxxx")