title: Remove Special Characters, Numbers and Double Spaces from String
body: <p>I want to remove <code>Special Characters</code>, <code>Numbers</code> and <code>Double Spaces</code> from a string, but it's removing all spaces. How can I fix it?</p>
  
  <p>Code:</p>
  
  <pre><code>_tfName.text = [[_tfName.text componentsSeparatedByCharactersInSet:[[NSCharacterSet letterCharacterSet] invertedSet]] componentsJoinedByString:@""];
  </code></pre>
  
  <p>Strings:</p>
  
  <pre><code>Real String          Formated          What I want
  ___________          ________          ___________
  Lincon  Man          LiconMan          Licon Man
  Name Surname         NameSurname       Name Surname
  09123721*)(%!@ˆ*#    *blank*           *blank*
  </code></pre>