How to find identifier in IOS7

You cannot get the unique identifier directly in iOS7.

In app delegate, there is a method called "application:didRegisterForRemoteNotificationsWithDeviceToken:", Use this method you can get the deviceToken in NSData, then you can use NSRegularExpression with pattern "[><]" to replace with "" for NSData's description. Then that will be the "unique identifier" you are looking for. 

我们现在不能直接得到唯一表示用 

[[UIDevicecurrentDevice] uniqueIdentifier]

但是我们可以使用"application:didRegisterForRemoteNotificationsWithDeviceToken:"来得到。