Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download iOS and tvOS iCloud Plugin Free.
iOS and tvOS iCloud Plugin
iCloud is the next big thing from Apple allowing seamless data storage in the cloud. As it turns out, this is the perfect way to persist game data as well. Current level, scores, achievements and anything else you can think of will automatically be sent to all the devices a user has.
Implementing it could not be easier: swap your calls to PlayerPrefs with our P31Prefs class and let it do it’s magic: if iCloud is available it will use it and if it isn’t it falls back to standard PlayerPrefs. It couldn’t be any easier! If you need a bit more storage you can now use the P31CloudFile class to transparently persist all your files to iCloud as well. And if that isn’t enough you can also use CloudKit for storing files as well!
Supports both iOS and tvOS (Apple TV)!