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There is no solution to this problem now. Apple prohibits identification of devices
UUID is basically enough

i Apple doesn’t want you to get it and prohibits you from labeling your phone. You can only use OpenUDID or UUID+keychain, but neither is a perfect solution and you must make a choice

3 seems to be unable to satisfy

I studied this problem one day before
The final answer is that there is no solution
My final solution is
I work on smart hardware
I asked the hardware side to tell me the unique ID of the hardware

You can get the deviceId of the device, this is accurate

Someone has already answered it. If there is no solution, you can only use UUID

Apple is awesome, no solution

There is a UDID framework that can generate a unique identifier by yourself, but it is not a real UDID, just a simple unique identifier. Search it yourself.

OpenUUID