Ruby Script to create AssetCatalogs file in iOS Application. It basically fetches all the .png files from the application folder and subfolders and create a single AssetCatalog files inside the application. Most of the design developer collaboration issues will be sorted out with this script. Ask the designer to give all the assets and put into …

AssetCatlogCreationScript

require 'find' 
require 'fileutils'
require 'tmpdir'

def createAssetCatalogFile()

	message = '
	Creating Asset Catalogs file ...'
	
	puts message

	fileName = "images.xcassets"
	projectFolderName = Dir.getwd

	# Create asset catalog file if doesnt exists
	if File.directory?("#{fileName}") == false
 		Dir.mkdir(fileName)
	end

	# Fetch all the png files from the project folder
	Dir.glob("#{projectFolderName}/**/*.png").each do |asset|

		#Jump into asset catalog folder
		Dir.chdir(fileName)
		
		assetName = File.basename(asset,'.*')
		assetNameWithout2x = ""
		if assetName.include? "@2x"
			assetNameWithout2x = assetName.gsub("@2x", "")
			imageSetName = "#{ assetNameWithout2x }.imageset"
		else	
			imageSetName = "#{ assetName }.imageset"
		end
		

		#If directory doesnt exists, create new ImageSet directory which holds images
		if File.directory?("#{imageSetName}") == false
 			Dir.mkdir(imageSetName)
		end

 		#Jump into ImageSet directory
 		Dir.chdir(imageSetName)
		FileUtils.mv("#{asset}", "#{assetName}.png")
		
 		#Create Json File which needs to be present for every ImageSet
 		createJsonfile(assetNameWithout2x)
 		
 		#Jump back to parent directory
 		Dir.chdir(projectFolderName) 
 	end
end
 

def createJsonfile(fileName)
	fileName_1x = "#{fileName}.png"
	fileName_2x = "#{fileName}@2x.png"
	
	content = '{
		"images" : [
			{
				"idiom" : "universal",
				"scale" : "1x",
				"filename" : "'"#{ fileName_1x }"'"
				},
			{
      			"idiom" : "universal",
      			"scale" : "2x",
      			"filename" : "'"#{ fileName_2x }"'"
    		}
  		],
  		"info" : {
    		"version" : 1,
    		"author" : "xcode"
  		}
	}'
	target  = "Contents.json"

	File.open(target, "w+") do |f|
  		f.write(content)
	end
end

createAssetCatalogFile()

Do you have updated script ? Or it will work with Xcode 6?

Thanks for the script! You should update it for XCode 6 and gear it towards helping people generate assets for their animations for the Apple Watch.