为什么当我从 Swift 中的同一部 iPhone 中删除应用程序时，我的唯一设备 ID 会发生变化？

Question

I am getting the current device ID of an iPhone by using the below code:

 let deviceId: String = (UIDevice.current.identifierForVendor?.uuidString)!

...but when I delete the app from the same phone its ID is changing. Why?

The device ID has to be changed when I install the app in other devices.

How do I do that? Please help me with code.

Answer 1

That's the way Apple designed it to work. From the documentation :

The value in this property remains the same while the app (or another app from the same vendor) is installed on the iOS device. The value changes when the user deletes all of that vendor's apps from the device and subsequently reinstalls one or more of them. The value can also change when installing test builds using Xcode or when installing an app on a device using ad-hoc distribution. Therefore, if your app stores the value of this property anywhere, you should gracefully handle situations where the identifier changes.