title: iOS Different types of method signatures
body: <p>In iOS I know we can define methods with</p>
  
  <pre><code> 1.) -(void)sum i.e. a instance method.
  
   2.) +(void)sum i.e. a static method.
  </code></pre>
  
  <p>But what about method written as</p>
  
  <pre><code> 3.) (void)sum i.e without -(hyphen) and +(plus) sign 
  </code></pre>
  
  <p>Now the question is: </p>
  
  <ol>
  <li>What we call method written in point 3?</li>
  <li>When and how do we use them?</li>
  </ol>
  
  <p>A link where I have seen this type of method is </p>
  
  <p><a href="http://www.cocoawithlove.com/2010/05/handling-unhandled-exceptions-and.html" rel="nofollow">Exception Handling in iOS.</a></p>
  
  <p>Check method </p>
  
  <pre><code>void InstallUncaughtExceptionHandler()
  </code></pre>