Tasks

• – fullPathExtension

  Interprets the receiver as a path and returns its extension, if any (not including the extension divider). Supports multiple extensions, like ‘file.tar.gz’.

• – stringByDeletingFullPathExtension

  Returns a new string made by deleting the full extension (if any) from the receiver.

• – stringByAppendingSuffixToFilename:

  Creates a string by appending a suffix to a filename in front of its extension.

• – stringByAppendingScaleSuffixToFilename:

  Creates a string by appending a scale suffix (e.g. @2x) to a filename in front of its extension.

• – contentScaleFactor

  Expects the string to be a filename/path and returns the scale factor (‘@2x’ -> 2).