title: Objective-C get list of files and subfolders in a directory
body: <p>What is the trick to get an array list of full file/folder paths from a given directory?
  I'm looking to search a given directory for files ending in .mp3 and need the full path name that includes the filename.</p>
  
  <pre><code>NSArray* dirs = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:sourcePath error:Nil];
  
  NSArray* mp3Files = [dirs filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"self ENDSWITH '.mp3'"]];
  </code></pre>
  
  <p>this only returns the file name not the path</p>