Requires Unity 5.0.0 or higher.
Access the iOS Keychain through Unity and store data that can be automatically synced across devices and persist between installations.
通过Unity访问iOS密钥链并存储数据，这些数据可以跨设备自动同步并在安装之间保持
Common uses include:
? Game save file
? Preferences
? Passwords
? Unique Identifier to consistently identify a user, even after they uninstall/reinstall the application or switch to a new device.
? Compatible with tvOS All other platforms are compatible and encrypt data and save it locally. Users will not be able to edit this data!
Requires iOS 7+ and iCloud Keychain to be enabled for syncing to work
