title: iOS Left menu by button using MMDrawerController
body: <p>I got some troubles making button for open/close leftside menu.</p>
  
  <p>I made a button, but I can not configure it correctly, because I can't recognize whether the left view is open. It can be opened by swipe(special MMDrawer method), so I can't use a regular BOOL variable lika 'isOpen'. Also, I find it difficult to find a property for left view status (open/close).</p>
  
  <p>I was surprised, that noone had trouble like this.</p>