允许用户在一台设备上创建帐户并在其他设备上使用该帐户
我想制作一个具有一些信息显示视图的应用程序。如果我在 iPhone 上安装应用程序，那么它应该显示该信息。如果我随后在 iPad 上安装该应用程序，则该应用程序应识别该设备并显示与我的帐户相关的信息。
有没有办法在没有用户 iTunes 凭据的情况下找到两个设备的单个用户，或者是否可以生成可以识别两个设备的共同用户的密钥？
I want to make an application that has some views for information display. If I install my app on my iPhone then it should display the info. If I then install that app on my iPad then the app should recognize the device and display the info related to my account.
Is there any way to find the single user of two devices without the user's iTunes credentials, or is it possible to generate a key that can identify the common user of both devices?
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否，根据您提供的信息，目前无法将多个设备与拥有这些设备的单个用户关联。
但是，如果您添加了“我想要在视图中显示的信息，属于两个设备的 Game Center 中的同一用户帐户”，那么您可以使用 Game Kit API 中的玩家标识符。
https://developer.apple.com/game-center/
No, currently there is no way to associate multiple devices to a single user owning those devices given the information you've provided.
However, if you added, "the information I want to display in the views, pertains to the same user account in Game Center for both devices", then you could use the player's identifier from Game Kit API.
https://developer.apple.com/game-center/
这是事后添加的，但是：
您可以使用 iCloud API 来完成此操作。这些与 iTunes 凭据不同，但显然是相同类型的先决条件，即用户必须拥有一个帐户，并且该帐户不受您的控制。
This is being added well after the fact, but:
You could use iCloud APIs to accomplish this. These are distinct from iTunes credentials, but obviously the same type of prerequisite in that the user must have an account and it's not under your control.