I would like to implement a toggle button so people can choose if they want to sync with icloud anytime.

I found https://fluffy.es/toggle-icloud-sync-nspersistentcloudkitcontainer/ , this seems working well, except two problems happen when user switch "not sync" to "sync" in one of device:

1. In debug windows, it shows:

NSLocalizedFailureReason=CloudKit setup failed because there is another instance of this persistent store actively syncing with CloudKit in this process., NSUnderlyingException=Illegal attempt to register a second handler for activity identifier

2. the cloud data overwrite the local new data, even I am using NSMergeByPropertyObjectTrumpMergePolicy

if I created only once PersistentCloudContainer in init, and change cloudKitContainerOptions + loadPersistentStores everytime user toggle, there will be error during loadPersistentStores: NSUnderlyingException : Can't add the same store twice

Any tips? Thank you very much!