问题
Hi I'm working on an iphone app that needs to be maintain a somewhat unique identifier per download. Is there a way to retrieve either the Apple ID used to download the App or another identifier I can use to link all devices with that download to a remote database/service?
Basically I want a single instance of my custom-generated data sitting on whatever device is linked to a certain Apple ID. If iTunes signs any App that you download, using that checksum would also be an option.
Any thoughts?
回答1:
If you use IAP(In App Purchase), you can tie a users purchase to a single receipt, and verify that receipt against Apple's servers.
For App store purchases, as opposed to IAP, Apple allows, and pretty much forces a developer to allow their App store apps to run identically on as many devices as a customer can put their iTunes account on, with no information available to the app about whether this was the customer's first install or their Nth. If that business model doesn't work for you, don't put the app for sale in the App store.
回答2:
As far as I am aware, there is absolutely no way to get access to the current signed-in Apple ID on the device. Your only real option is to maintain your own username/login combo that the user has to enter on each device they own.
回答3:
I don't believe you can get the Apple ID, but you can however get the current device's ID via the UIDevice uniqueIdentifier method.
For example:
UIDevice *ourDevice = [UIDevice currentDevice];
NSString *uniqueIdentifier = [ourDevice uniqueIdentifier];
However, you should note the following (emphasis mine) from the above linked document:
A device’s unique identifier (sometimes abbreviated as UDID for Unique Device Identifier) is a hash value composed from various hardware identifiers such as the device serial number. It is guaranteed to be unique for each device. The UDID is independent of the device name. For devices that use a SIM (subscriber identity module) card, the UDID is independent of the SIM card.
For user security and privacy, you must not publicly associate a device’s unique identifier with a user account.
You may use the UDID, in conjunction with an application-specific user ID, for identifying application-specific data on your server.
来源：https://stackoverflow.com/questions/4753223/apple-id-retrievable-from-app-download-within-cocoa-touch