Objective-C: Best way to store error messages

What's the best way to store error messages (specially while developing with Xcode and Objective-C for Mac and iPhone):

1. Creating a separate class that contains list of error code and corresponding messages
2. .plist of error code and corresponding messages
3. Localizable.string 开发者_StackOverflowfile with error code and corresponding messages (the application may or may not support localization)
4. Other(s)

I'm sure i don't have to give a reason why anyone would want to keep all the error messages in one location. Thanks.

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Your file doesn't have to be called Localizable.strings. You can have a file called Errors.strings. When you want to get the error description, you can use:

NSString *errCode = @"err1";
NSString *errDesc = [[NSBundle mainBundle] localizedStringForKey:errCode
                                                           value:nil
                                                           table:@"Errors"];

You could use a plist file, however all the work is done for you with a strings file, you don't have to write any code to parse any file or initialise some dictionary or array (no matter how easy that is anyway).

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I would go for option 3. If you want to support localizations later on, you will need the .strings files anyway.

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I've done something similar to this in the past, and I used something like option #2.

A file (.plist or otherwise) where an entry consists of "ErrCode Description" makes it easy to parse/search for certain errors.