title: Class method equivalent of -respondsToSelector:
body: <p>Is there a class method equivalent to <code>-respondsToSelector:</code>?</p>
  
  <p>Something like <code>+respondsToSelector:</code>?</p>
  
  <p>The reason I am asking is because by implementing <code>-respondsToSelector:</code> on a class level, I get a compiler warning: "found '-respondsToSelector:' instead of '+respondsToSelector:' in protocol(s)".</p>
  
  <p>The code looks like this:</p>
  
  <pre><code>Class &lt;SomeProtocol&gt; someClass = [someInstance class];
  
  if ([someClass respondsToSelector:@selector(someSelector:)]) {
      someVar = [someClass someSelector:someData];
  }
  </code></pre>