title: How to Convert NSInteger or NSString to a binary (string) value
body: <p>Anybody has some code in objective-c to convert a NSInteger or NSString to binary string?</p>
  
  <p>example:</p>
  
  <p>56 -> 111000</p>
  
  <p>There are some code in stackoverflow that try do this, but it doesn´t work.</p>
  
  <p>Thanks</p>