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    <p>First, names are very important in building an SDK. Your names are a bit confusing. <code>CarData</code> sounds very much like it is related to an <code>NSData</code>. The typical name for "a class that holds information about another class" is a "descriptor." So, I would call this <code>CarDescriptor</code>. See <code>UIFont</code> and <code>UIFontDescriptor</code> for inspiration.</p> <p>Next, your <code>carWithData:onSuccess:onError:</code> very much sounds like it should return a <code>Car</code>, but it appears to be <code>void</code>. I recommend the following:</p> <pre><code>+ (void)createCarWithDescriptor:(CarDescriptor *)descriptor completion:(void (^)(Car *car, NSError *error))completion; </code></pre> <p>It is preferred to have a <a href="https://stackoverflow.com/questions/18362957/should-my-block-based-api-have-just-completion-or-both-success-and-failure-handl">single completion block, rather than two.</a> Do not prefix completion handlers with <code>on</code>.</p> <p>The <code>CarDescriptor</code> class should help you with your searching question as well, but it should not include things like limits. You should wrap that in a <code>CarSearchRequest</code> (or possibly just a <code>CarSearch</code>). See <code>NSFetchRequest</code> for inspiration. Whether you pass a <code>CarDescriptor</code> or need a full predicate depends on how your service manages searches. (Of course, you could always have code that converts a <code>CarDescriptor</code> into a predicate.) Again, look at how <code>UIFontDescriptor</code> is used to search for fonts for inspiration.</p>
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    1. USRob Napier
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    1. COGreat answer. The famous AFNetwork library uses that pattern (successBlock, failureBlock). I can't stress enough how awful is having such interface. Thanks for pointing that ;-)
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    2. COIf I want to validate the properties of the descriptor .. where do I add the valdiation inside the descriptor class?
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      1. USKermit the Frog
    3. COIt depends on what "validation" means. Typically it is best to make it impossible to pass illegal values (using enums rather than strings for instance). But if it has to be validated on the server (confirming that a make and model combination actually exists), then you should do that during car creation. The description should never talk to the server. It is merely a description. It is legal to describe a thing that does not exist.
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