title: how importing pdf files in swift
body: <p>I am beginner iOS developer and i  have <a href="http://www.apress.com/9781484204108?gtmf=b" rel="nofollow">this book</a>.<br>
  Its greater book but I did not find my answer on it.
  I am try and search as many as I can about how I can importing pdf file in xcode6.1 using swift.<br>
  The idea is my app for learn some English lessons for beginner level so i put all lessons in  separated pdf files and i want user click on lesson names  then pdf file according to this lesson will open.</p>
  
  <p>I hope you understand idea.
  please help me how I can do this</p>