问题
Since the announcement by Apple that all apps distributed by the App Store require 64-bit support, I've had to build multiple-architecture fat binaries that increase the size of the resulting IPA. Does this size increase directly affect my users, or does the App Store strip out irrelevant architectures from an IPA containing fat binaries when downloading to a device?
回答1:
It does not appear that they currently do, since that feature was announced for iOS 9.
Slicing is the process of creating and delivering variants of the app bundle for different target devices. A variant contains only the executable architecture and resources that are needed for the target device. You continue to develop and upload full versions of your app to iTunes Connect. The App Store will create and deliver different variants based on the devices your app supports.
来源：https://stackoverflow.com/questions/29011677/does-the-app-store-remove-architectures-from-an-ipa