How to generate a random identifier using UUID
A UUID is a universally unique identifier, which means if you generate a UUID right now using UUID it's guaranteed to be unique across all devices in the world. This means it's a great way to generate a unique identifier for users, for files, or anything else you need to reference individually – guaranteed.
Here's how to create a UUID as a string:
let uuid = UUID().uuidStringAvailable from iOS 6.0
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