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XcodeColors allows you to use colors in the Xcode debugging console.
It's designed to aid in the debugging process. For example:

• Make error messages stand out by printing them out in red.
• Use different colors for logically separate parts of your code.

You're not limited to a restricted color palate.
You can specify, in your source code, the exact RGB values you'd like to use.
You can specify foreground and/or background color(s).

XcodeColors is a simple plugin for Xcode 3, 4 & 5.

• Download or clone the repository.
• Open the XcodeColors project with Xcode
• If compiling for Xcode 4, then change the schemes to use the Xcode4 build configuration (instead of the Xcode5 build configuration which is the default)
• Compile the XcodeColors target.
  When you do this, the Xcode plugin is automatically copied to the proper location.
  This is done via the build settings. You can validate the plugin was copied to "~/Library/Application Support/Developer/Shared/Xcode/Plug-ins/XcodeColors.xcplugin"
• Now completely Quit Xcode
• Re-Launch Xcode, and re-open the XcodeColors project
• Now run the TestXcodeColors target.
  This will test your installation, and you should see colors in your Xcode console.

Did you upgrade Xcode and now XcodeColors is "broken"? Get the fix here: XcodeUpdates.

Wow, you're still running Xcode 3?

See this page for installation instructions:
http://deepitpro.com/en/articles/XcodeColors/info/index.shtml

There are 2 ways to use XcodeColors:

1. Manually specify the colors inside NSLog (or create custom macros)
2. Use CocoaLumberjack

• Testing to see if XcodeColors is installed and enabled:

  char *xcode_colors = getenv(XCODE_COLORS);
  if (xcode_colors && (strcmp(xcode_colors, "YES") == 0))
  {
      // XcodeColors is installed and enabled!
  }

• Enabling / Disabling XcodeColors

  setenv("XcodeColors", "YES", 0); // Enables XcodeColors (you obviously have to install it too)
  
  setenv("XcodeColors", "NO", 0); // Disables XcodeColors

• Using XcodeColors

  The following is copied from the top of the XcodeColors.m file:

  // How to apply color formatting to your log statements:
  // 
  // To set the foreground color:
  // Insert the ESCAPE into your string, followed by "fg124,12,255;" where r=124, g=12, b=255.
  // 
  // To set the background color:
  // Insert the ESCAPE into your string, followed by "bg12,24,36;" where r=12, g=24, b=36.
  // 
  // To reset the foreground color (to default value):
  // Insert the ESCAPE into your string, followed by "fg;"
  // 
  // To reset the background color (to default value):
  // Insert the ESCAPE into your string, followed by "bg;"
  // 
  // To reset the foreground and background color (to default values) in one operation:
  // Insert the ESCAPE into your string, followed by ";"
  
  #define XCODE_COLORS_ESCAPE @"\033["
  
  #define XCODE_COLORS_RESET_FG  XCODE_COLORS_ESCAPE @"fg;" // Clear any foreground color
  #define XCODE_COLORS_RESET_BG  XCODE_COLORS_ESCAPE @"bg;" // Clear any background color
  #define XCODE_COLORS_RESET     XCODE_COLORS_ESCAPE @";"   // Clear any foreground or background color

  To manually colorize your log statements, you surround the log statements with the color options:

  NSLog(XCODE_COLORS_ESCAPE @"fg0,0,255;" @"Blue text" XCODE_COLORS_RESET);
  
  NSLog(XCODE_COLORS_ESCAPE @"bg220,0,0;" @"Red background" XCODE_COLORS_RESET);
  
  NSLog(XCODE_COLORS_ESCAPE @"fg0,0,255;"
        XCODE_COLORS_ESCAPE @"bg220,0,0;"
        @"Blue text on red background"
        XCODE_COLORS_RESET);
  
  NSLog(XCODE_COLORS_ESCAPE @"fg209,57,168;" @"You can supply your own RGB values!" XCODE_COLORS_RESET);

• Defining macros

  You may prefer to use macros to keep your code looking a bit cleaner.
  Here's an example to get you started:

  #define LogBlue(frmt, ...) NSLog((XCODE_COLORS_ESCAPE @"fg0,0,255;" frmt XCODE_COLORS_RESET), ##__VA_ARGS__)
  #define LogRed(frmt, ...) NSLog((XCODE_COLORS_ESCAPE @"fg255,0,0;" frmt XCODE_COLORS_RESET), ##__VA_ARGS__)

  And then you could just replace NSLog with LogBlue like so:

  LogBlue(@"Configuring sprocket...");
  LogRed(@"Sprocket error: %@", error);

The CocoaLumberjack framework natively supports XcodeColors!
Lumberjack is a fast & simple, yet powerful & flexible logging framework for Mac and iOS.

From it's GitHub page:

[Lumberjack] is similar in concept to other popular logging frameworks such as log4j, yet is designed specifically for Objective-C, and takes advantage of features such as multi-threading, grand central dispatch (if available), lockless atomic operations, and the dynamic nature of the Objective-C runtime.

In most cases it is an order of magnitude faster than NSLog.

It's super easy to use XcodeColors with Lumberjack!

And if color isn't available (e.g. XcodeColors isn't installed), then the framework just automatically does the right thing. So if you install XcodeColors on your machine, and enable colors in your team project, your teammates (without XcodeColors... yet) won't suffer, or even notice.

Plus Lumberjack colors automatically work if you run your application from within a terminal! (E.g. Terminal.app, not Xcode) If your terminal supports color (xterm-color or xterm-256color) like the Terminal.app in Lion, then Lumberjack automatically maps your color customizations to the closest available color supported by the shell!

// Standard lumberjack initialization
[DDLog addLogger:[DDTTYLogger sharedInstance]];

// And then enable colors
[[DDTTYLogger sharedInstance] setColorsEnabled:YES];

// Check out default colors:
// Error : Red
// Warn  : Orange

DDLogError(@"Paper jam");                              // Red
DDLogWarn(@"Toner is low");                            // Orange
DDLogInfo(@"Warming up printer (pre-customization)");  // Default (black)
DDLogVerbose(@"Intializing protcol x26");              // Default (black)

// Now let's do some customization:
// Info  : Pink

#if TARGET_OS_IPHONE
UIColor *pink = [UIColor colorWithRed:(255/255.0) green:(58/255.0) blue:(159/255.0) alpha:1.0];
#else
NSColor *pink = [NSColor colorWithCalibratedRed:(255/255.0) green:(58/255.0) blue:(159/255.0) alpha:1.0];
#endif

[[DDTTYLogger sharedInstance] setForegroundColor:pink backgroundColor:nil forFlag:LOG_FLAG_INFO];

DDLogInfo(@"Warming up printer (post-customization)"); // Pink !