NSUbiquitousKeyValueStoreInitialSyncChange
A constant that indicates the initial attempt to load keys and values from iCloud is in progress.
Declaration
var NSUbiquitousKeyValueStoreInitialSyncChange: Int { get }Discussion
The system downloads the existing keys and values from iCloud when someone logs into a device using their Apple account. If you try to write a key and value to the iCloud data store while this initial download is in progress, the system generates the didChangeExternallyNotification notification with this key. Schedule the write operations after a delay to give the system time to download the data and ensure the local copies match the truth in iCloud.