title: In which folder do i have to save a data file in a IOS app?
body: <p>I'm developing a QRCode reader app. When a qrcore is scanned I want to save it data in a file.
  I don't want to back it up in icloud, I just want that the data of file don't be lost when the app is closed.</p>
  
  <p>so
  which folder should i save my data file?</p>
  
  <p>thanks</p>