How to reduce the size of my iPhone application?

Question

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Answer 1

Inspecting an .ipa File

Simply change the extension of an .ipa file to .zip, then open it with Finder to decompress it. Right-click on the unzipped .app bundle and choose "Show Package Contents" to see the resources inside. This can give you an idea of what is using the most space.

You can examine the compressed size of each item in your .ipa by opening Terminal and executing the following command:

unzip -lv /path/to/your/app.ipa

The size column has the compressed size of each file within your .ipa file. You should evaluate this size as you work to reduce the size of resources in your app. You may reduce the size of a resource by a lot, but after producing an .ipa file, you may discover the compressed size of that resource has not changed as dramatically. The most effective technique for reducing the size of an .ipa file is to remove unnecessary resources.

To access the full article, see the link from Apple Developer Website.