title: Is PNG preferred over JPEG for all image files on iOS?
body: <p>Xcode optimizes png images so they are loaded faster, but is this also recommended for other image resources that are not for buttons and UI (Photos for example)?</p>
  
  <p>Or is it a standard to have UI images as png and "photos" as JPEG?</p>
  
  <p>What is the best practice here?</p>