App Store Incremental update

Https://developer.apple.com/library/ios/qa/qa1779/_index.html

Support for incremental updates at the file level from ios6.x to iOS7.0, which replaces modified files with new files.

Incremental updates at the file content level are supported starting from 7.1, which is to update only the modified content. But relative, the installation time will increase.

Official advice:

To optimize the size of your app updates, you should consider the tips:

• Unnecessary modifications to files. Compare the contents of the prior and new versions of your app with diff or another directory comparison tool and verify That's you ' ve only changed expect within your app bundle.

• Content that you expect to the change in an update should is stored in the separate files from content so you don ' t expect to CH Ange. This reduces the size of the update package and increases it install speed.

App Store Incremental update