NEW! Master Swift design patterns with my latest book! >>

How to generate a random identifier using UUID

Paul Hudson       @twostraws

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().uuidString

Available from iOS 6.0

Did this solution work for you? Please pass it on!

Other people are reading…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

Take Swift further!

Your Swift skills let you make apps for macOS, watchOS, tvOS, and more, and for one low price you can learn it all with my Swift Platform Pack!

MASTER SWIFT NOW
Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Practical iOS 11 Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let me know!

Click here to visit the Hacking with Swift store >>