On how many devices my iOS app is installed

Question

After a whole day search, i'm unable to find a good solution

Apple does't allow to check IMEI number of iDevice

Apple does't allow to check UDID (Its deprecated)

there is an option of "identifierForVendor" , but i found it may change if user uninstall and reinstall the app.

My Problem at this time is this

for single "Specific USER NAME" any one can install my app on upto 5 iDevices, after that user must change the "USER NAME"

my app just ask this on first Launch and never again. at this stage i want a check or Counter Like anything that counts the iDevices for that "USER NAME" to check if it is 1st, second …. ……… or fifth. ….

need your ideas or help on this matter / issue

Answer 1

您可以尝试使用applet提供的令牌来进行APN（Apple推送通知），这对于device + app来说是唯一的……可能会出现问题，即应用程序会要求用户获得推送通知的权限，但是您可以将其强制设置为您的应用程序，并使其仅在casa用户接受的情况下起作用。

Answer 2

What i have got from your question is that you need a unique identifier to identify total devices . Please take a look at my answer here at this post i may help you understand many things ( How to generate unique identifier which should work in all iOS versions? )