a great tool for automatically formating your code!

1. make your own format file at your project's root or file's folder. (The clang-format will automatically use the latest format file to format your code)
vim .clang-format
IndentWidth: 8
UseTab: Always
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
2. Then use the clang-format plug-in to automatically format your code.
Edit-->Clang-format-->Format File in Focus
 
Most likely, you'll have a .clang-format file at the root of your project.
So easy! so neat!
 
ClangFormat-Xcode
An Xcode plug-in to format your code using Clang's format tools, by  @travisjeffery .
With  clang-format  you can use Clang to format your code to styles such as LLVM, Google, Chromium, Mozilla, WebKit, or your own configuration.
Installation:
Install via  Alcatraz .
OR
Clone this repo, build and run ClangFormat, restart Xcode.
Usage:
Format on save
I.e., you press  command-s  and the file is formatted and wrote to disk.
In the menu, open Edit > Clang Format > Click Format on save (a checkmark appears in this menu item indicicating that the feature is active.)
Assign keyboard shortcuts
You can assign your own keyboard shortcuts like so:

Open the System Preferences > Keyboard > Shortcuts > App Shortcuts > Click +

Set the application to be Xcode

Set the menu title to an action title, e.g. "Format File in Focus"

Set your shortcut

In this example, we'll format the active file when  control-i  is pressed.
Using your own style configuration
By using Clang Format > File in the plug-in menu, Clang will look for the nearest  .clang-format  file from the input file. Most likely, you'll have a .clang-format file at the root of your project.
Here are the options for .clang-format and how they're configured .
If one of the built-in styles is close to what you want, you can bootstrap your own configuration with: ./bin/clang-format -style=llvm -dump-config > .clang-format
For example, this .clang-format is similar to the  Linux Kernel style :

BasedOnStyle: LLVM

IndentWidth: 8

UseTab: Always

BreakBeforeBraces: Linux

AllowShortIfStatementsOnASingleLine: false

IndentCaseLabels: false

And this is similar to Visual Studio's style:

UseTab: Never

IndentWidth: 4

BreakBeforeBraces: Allman

AllowShortIfStatementsOnASingleLine: false

IndentCaseLabels: false

ColumnLimit: 0