title: How to make a Navigation bar transparent and fade out like in the photo app in the iPhone
body: <p>i am new to iPhone Programming ...can anybody help me out please..</p>
  
  <p>i want to develop an app like photo app in iPhone..</p>
  
  <p>How to make the naveigation bar and toolbar transparent and fadeout like in photo app in iPhone</p>
  
  <p>Thank u .. </p>