title: implicit declaration of function 'objc_lookUpClass'
body: <p>I am getting this warning for the line code:</p>
  
  <pre><code>Class myClass = objc_lookUpClass([_className UTF8String]);
  </code></pre>
  
  <p>I am adding</p>
  
  <pre><code>#import &lt;Foundation/NSObjCRuntime.h&gt;
  #import &lt;objc/objc.h&gt;
  </code></pre>
  
  <p>And it still don't resolve the problem</p>
  
  <p>Another warning i get on this line is:
  "Initialization makes pointer from integer without a cast"</p>