Getting bogged down by error handling in Cocoa. Am I going overboard?

Just as an example, let’s take a meth开发者_JAVA百科od for getting the App Support directory. What if NSSearchPathForDirectoriesInDomains returns no elements? What if it’s not a directory but a file? What if it couldn’t be created?

My methods are getting cluttered up not just by adding doing the checks but also from constructing the error objects, assigning error codes etc.

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You probably are overdoing it. From your example, if that function is returning no elements or a file, then something is seriously wrong, and there's no way that your application can recover from it. At that point, letting the error cause a crash is the only sensible thing to do.