One popular code beautification tool is the open source Uncrustify tool. Uncrustify is incredibly versatile, but going through the hundreds of available options to set things up can be extremely difficult.
Ryan Maxwell has created an open source tool for Uncrustify called UncrustifyX that runs on Mac OS X 10.8+ that you can use with Objective-C (along with C/C++/C# Java Pawn and Scala).
The tool provides a GUI so you can easily modify the Uncrustify configuration objects and get things exactly how you’d like.
Here are a couple of images from the readme showing UncrustifyX in action:
You can find a gist containing an example Objective-C configuration to get you started on Github here.
The original Uncrustify source code beautifier tool can be found here.
An excellent tool for code beautification that you can easily configure to your liking.
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