icon-exporter.jsx

#target Illustrator

//https://developer.apple.com/library/content/documentation/Xcode/Reference/xcode_ref-Asset_Catalog_Format/ImageSetType.html#//apple_ref/doc/uid/TP40015170-CH25-SW2
//https://developer.apple.com/library/content/documentation/Xcode/Reference/xcode_ref-Asset_Catalog_Format/AppIconType.html#//apple_ref/doc/uid/TP40015170-CH22-SW1

/*
  includes
*/
//json
#include "json2.js"
//Illustrator's interpreter is not support map function
Array.prototype.map = function (callback) {
  var obj = Object(this);
  if (obj.length === 0) return null;
  if (typeof(callback) === 'undefined') return null;
  for (var i = 0, o; o = obj[i]; i++) {
    obj[i] = callback(o);
  }
  return obj;
};
//Illustrator's interpreter is not support indexOf function. what??? why????
Array.prototype.indexOf = Array.prototype.indexOf || function(value, start) {
  for (var i = 0, length = this.length; i < length; i++) {
    if (this[i] == value) {
      return i;
    }
  }
  return -1;
}

if (app.documents.length > 0) {
    main();
}
else alert('Cancelled by user');


/*
    parser
*/
function parseFromIcon(icon){
    var ALLOWED_IDIOMS = ['iphone','ipad','universal','ios-marketing'];
    /*
    appLauncher
    An image shown app launcher on watchOS

    companionSettings
    An image for the Apple Watch Settings app

    ios-marketing
    An image for the App Store icon

    iphone
    The image is for iPhone devices.

    ipad
    The image is for iPad devices.

    mac
    The image is for Mac computers.

    notificationCenter
    An image for the notification center on watchOS.

    quickLook
    An image used for a long look on watchOS.

    tv
    The image is for Apple TV.

    universal
    The image works on any device and platform.

    watch
    The image is for the Apple Watch devices.

    watch-marketing
    An image for the App Store icon.

    Tag not included
    Same as specifying universal.
    */
    var ALLOWED_PLATFORM = ['ios','macos','tvos','watchos'];
    var filenameStr = icon.split("@");
    var iconName = filenameStr[0].split("_");

    if(iconName.length!=2){
        alert("Invalid icon name. See Readme for more information.", iconName);
        return null;
    }

    var sizeArr = iconName[1].split("x");
    if(sizeArr.length>2){
        alert("Invalid size. See Readme for more information.", sizeArr.join(''));
        return null;
    }
    if(sizeArr.length==1){
        sizeArr = [sizeArr[0],sizeArr[0]];
    }

    var scale = filenameStr.length == 2 ? filenameStr[1] : '1x';
    var scaleFloat = parseFloat(scale.replace('x',''));
    var idiom = ALLOWED_IDIOMS.indexOf(iconName[0])>-1 ? iconName[0] : "universal";
    var platform = (idiom=="universal" /* || idiom=="ios-marketing"*/) && ALLOWED_PLATFORM.indexOf(PLATFORM)>-1 ? PLATFORM : null

    return {
        "idiom": idiom,
        "platform": platform,
        "size": sizeArr.join('x'),
        "scaledSizeArr": [sizeArr[0] * scaleFloat, sizeArr[1] * scaleFloat],
        "filename": icon ? icon+".png" : null,
        "scale": scale,
        "scaleFloat": scaleFloat
    };
}

function makeContentJs(icons){
    return {
        images: icons.map(function(icon){
            var iconDict = parseFromIcon(icon);
            var content = {};
            content["idiom"] = iconDict.idiom;
            content["filename"] = iconDict.filename;
            content["scale"] = iconDict.scale;
            content["size"] = iconDict.size;
            if(iconDict.platform){
                content["platform"] = iconDict.platform;
            }
            return content;
        }),
        info: {
            version: 1,
            author: "xcode"
        }
    }
}

function main() {
    var document = app.activeDocument;
    var afile = document.fullName;
    var filename = afile.name.split('.')[0];

    var folder = afile.parent.selectDlg("Export as CSS Layers (images only)...");

    if(folder != null)
    {
        var activeABidx = document.artboards.getActiveArtboardIndex();
        var activeAB = document.artboards[activeABidx]; // get active AB
        var abBounds = activeAB.artboardRect;// left, top, right, bottom

        var options = new ExportOptionsPNG24();
        options.antiAliasing = true;
        options.transparency = true;
        options.artBoardClipping = true;

        /*
          export image files
        */
        for(var i = 0; i < ICONS.length; i++){
            var iconDict = parseFromIcon(ICONS[i]);
            var file = new File(folder.fsName + '/' + iconDict.filename);
            options.horizontalScale = 100 * (iconDict.scaledSizeArr[0] / document.width);
            options.verticalScale = 100 * (iconDict.scaledSizeArr[1] / document.height);

            document.exportFile(file,ExportType.PNG24,options);
        }

        /*
            export file
        */
        var contentsJson = new File(folder.fsName + "/Contents.json");
        contentsJson.open("w");
        contentsJson.write(JSON.stringify(makeContentJs(ICONS), null, 2));
        contentsJson.close();
    }
}

/*
ref to format

https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/IconMatrix.html#//apple_ref/doc/uid/TP40006556-CH27-SW1

    {
      "idiom": "iphone",
      "size": "29x29",
      "filename": "AppIcon-29@2.png",
      "scale": "2x"
    },

    {
      "idiom" : "universal",
      "scale" : "2x",
      "filename" : "iTunesArtwork@2x.png"
    },
    {
      "idiom" : "universal",
      "scale" : "3x"
    }
*/