NEW! Check out my latest book, Testing Swift! >>

How to identify an iOS device uniquely with identifierForVendor

Paul Hudson       @twostraws

Early iOS releases gave every device a unique identifier, but this was soon abused by developers to identify individual users uniquely – something that Apple really dislikes. So, Apple removed the truly unique identifier and instead introduced an identifier for each vendor: a UUID that's the same for all apps for a given developer for each user, but varies between developers and between devices.

That is, if a user has five of your apps installed and five of mine, your five will all share the same vendor identifier, and my five will all share the same vendor identifier, but our two identifiers will be different.

Here's how to use it:

if let uuid = UIDevice.current.identifierForVendor?.uuidString {
    print(uuid)
}

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.

Build for watchOS

Take your existing Swift skills to Apple's tiniest platform – check out Hacking with watchOS!

MASTER SWIFT NOW
Buy Testing Swift Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns 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 Advanced iOS Volume Two 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!

Average rating: 5.0/5

Click here to visit the Hacking with Swift store >>