Xcode changes unmodified storyboard and XIB files

This is not a bug, this is a consequence of how Xcode processes storyboard files. I am writing a diff and merge program for storyboard files (GitHub link) and I have spent hours analyzing the storyboard files logic and how Xcode processes it. This is what I discovered:

• Why do weird changes occur in storyboard files?Xcode uses the NSXML API to parse storyboard files into some NSSet-based logical tree structure. When Xcode needs to write changes it creates an NSXMLDocument based on the logical tree structure, clears the storyboard file and calls XMLDataWithOptions: to fill the file again. Because sets do not preserve the order of their elements, even the slightest modification could change the whole storyboard XML file.

• Why does the class tag disappear or reappear randomly?The <class> section is nothing more than an internal Xcode cache. Xcode use it to cache information about classes. The cache changes often. Elements are added when class .h/.m files are opened and removed when Xcode suspects they are outdated (at least older Xcodes behave like this). When you save the storyboard, the current version of the cache is dumped, which is why the <class> section often changes or even disappears.

I have not reverse-engineered Xcode; I made these observations by experimenting with Xcode and storyboard files. Nevertheless, I am almost 100% sure it works this way.

Conclusions:

• Cache section is unimportant; you can safely ignore any change in it.
• Contrary to what you can find on all forums, merging storyboards files is not a complicated task. For example, let’s assume you changed MyController1 view controller in a storyboard document. Open the storyboard file, and find something like this <viewController id=”ory-XY-OBM” sceneMemberID=”MyController1”>.You can safely commit only changes in this section and ignore everything else. If you changed segues or constraints, also commit anything that has “ory-XY-OBM” inside. Simple!

This is a bug in XCode 4.5+, I hope it gets fixed, and yes its a PITA.

Here's the full bug at Apple

How to avoid Xcode gratuitous edits to storyboard files?

This issue can be mitigated somewhat by extremely judicious use of git add -p on any of Xcode's generated files, including storyboards, XIBs, Core Data models, and project files, all of which suffer from similar transient modifications that have no impact on the actual interface/model/project.

The most common junk changes I've seen on storyboards are the system version numbers (as you mention) and the constant addition and removal of the <classes> section, the omission of which I have never seen cause problems. For XIBs, it's the addition and removal of <reference key="NSWindow"/>, which isn't even a class in Cocoa Touch. Just wow.

Think of it like the sea: there is both a high and low tide. Let it wash over you.

Ahh. That's it.

You can ignore these modifications when staging your changes, reset the junk changes, and make a clean commit.

The single advantage I've seen with storyboards over XIBs from a technical standpoint is that Apple has not yet neutered FileMerge to refuse to merge conflicted storyboards. (FileMerge used to be able to merge XIBs, but newer versions broke that. Thxxxx guys 💜!!!)

Please file lots of bugs about all of these problems at http://bugreporter.apple.com/! And don't forget to create entries on OpenRadar.