Are there any Objective-C / Cocoa naming conventions for properties that are acronyms?

I have an object that models an online resource. Therefore, my object has to store the URL of the resource it belongs to. How would I name the getter and setter?

MyObject *myObject = [[MyObject alloc] init];

// Set values
[myObject setURL:url];
myObject.URL = url;

// Get values
[myObject URL];
myObject.URL;

or would the following be better:

MyObject *myObject = [[MyObject alloc] init];

// Set values
[myO开发者_高级运维bject setUrl:url];
myObject.url = url;

// Get values
[myObject url];
myObject.url;

The former example would of course require to define the property in the following way:

@property (retain, getter = URL, setter = setURL:) NSURL *url;

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Apple has a list of Acceptable Abbreviations and Acronyms, where URL is listed. I use URL myself, consistent with NSURLRequest, NSURLResponse, NSPersistentStore etc (which all have a URL property).

I think an advantage to using uppercase names is that it works better with camelcase: anURL looks better than anUrl (in my opinion).

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apple uses... both ;)

it looks like the pattern is moving towards url/setURL: