OCLint
oclint.org
oclint.org
My biggest complaint is integrating it with xcode is not great - it requires a second compilation after your regular build runs to generate the json compilation database it needs.
This is not the oclint team's fault, but it makes it frustratingly slow to use for every build - which is how linters should be used in my view.
Saying that, I've recently felt like the development of clang tidy has been much more active and it will become the do-it-all tool very soon.
OCLint does things like warn if there are too many non-comment-lines-of-code in a method, or too many methods per class. It's more about keeping tabs on complexity and code cleanlyness than true static analysis.
Ideally, use both! If you're using Xcode you can enable "analyze" for all builds. Highly recommended if it doesn't break your build times.