问题:

What is the size of the device token generated by APNs (Apple Push Notification). I am trying to store device tokens on the server side in a mysql database, and would like to know maximum size of device tokens generated

回答1:

You get told but it's currently 32 bytes. Apple says the token length is variable and to not hard code it

When you get a notification it has a header, currently 35 bytes in size. This is arranged as follows:

Byte 1: Command
Byte 2-3: Token length
Bytes 4-35: Token

Source: http://mark.aufflick.com/files/view/talks/apns.pdf

回答2:

Apple Push Notification Service Programming guide very clearly says:

"Important: APNs device tokens are of variable length. Do not hardcode their size."

回答3:

According to Apple's iOS Developer Library, it's 32 bytes, as Philip said.

Here's a link to their page on "Local and Push Notification Programming," which may include other helpful information on the subject.

https://developer.apple.com/library/mac/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/Chapters/Introduction.html

回答4:

The limit in iOS8 is reported to be 2k. Still half of the size of GCM's 4k, but I suspect most people will have to alter their tables to handle the new iOS8 token limit.