title: ios7 navigationbar left UIBarButtonItem issue
body: <p>I am updating my big project to ios7 . And When I update left navigation button have problem .
  I don't understand What is problem . </p>
  
  <p>ios6: left button image haven't problem  :</p>
  
  <p><img src="https://i.stack.imgur.com/CZlZZ.png" alt="enter image description here"> </p>
  
  <p>ios7: left button have problem</p>
  
  <p><img src="https://i.stack.imgur.com/1USvx.png" alt="enter image description here"></p>
  
  <p>Also when I go next viewcontroller back button have same problem in ios7:</p>
  
  <p><img src="https://i.stack.imgur.com/Sodsr.png" alt="enter image description here"></p>
  
  <p>I am using for menu this image: <a href="http://appdesignvault.com/downloads/socioville-hamburger-menu.zip" rel="nofollow noreferrer">link</a> . image is transparent . </p>
  
  <p>How can I solve this problem in ios7 . 
  it's big project and ı can't share all code.When I read article , article says it's problem is setTintColor.  right ? </p>
  
  <p>sorry my English. </p>
  
  <p>Thank you .</p>