How to make Sprite Kit display @2x images from atlas at correct size?

Question

When a project only has @2x images because it only targets retina display devices, atlas Sprite Kit atlas gets the scale wrong with the RGBA8888_COMPRESSED setting to use with P

Answer 1

Disclaimer: I have only tested this in XCode 6.

I open the Images.xcassets folder in the file system. Inside it are one folder for each image and inside each image folder there are the image files plus a json filed called Contents.json. It looks something like this:

    {
  "images" : [
    {
      "idiom" : "universal",
      "scale" : "1x",
      "filename" : "btn_orange.png"
    }
  ],
  "info" : {
    "version" : 1,
    "author" : "xcode"
  }
}

If I change the scale row to 2x, i.e.:

"scale" : "2x",

the image will be displayed as a retina image (and don't use the @2x suffix).