How to copy an Image programmatically to an asset catalog - swift

Question

I use the imagePickerController to choose an image from the camera roll. I would like to copy that image to an asset catalog like Images.xcassets. How can you do that?

Answer 1

Image xcassets are nothing more than a collection of images coupled with a specific file/directory organisation, and a JSON catalog, so there is nothing difficult in principle in creating them:
create an appropriate directory structure (I will refer to splash images, as they are the one I have more experience about):
myimages.xcassets/
myimages.xcassets/LaunchImage.launchimage
put your images in it
create an appropriate JSON catalog (spoiler: NSJSONSerialization) and again, my example is about splash images:
"images": [
{
"scale": "2x",
"orientation": "portrait",
"minimum-system-version": "7.0",
"filename": "launch_seed_ipad_portrait.png",
"idiom": "ipad",
"extent": "full-screen"
},
[... etc ...]
}
and that's it. Point is, as bundles, image catalogs are more a facility provided to ease image organisation from the Xcode project (for instance, I created them in a context of project automation), and not something meant to be compiled within the app, so your question looks a bit like asking:
how can I create a xib from code
how can I put together a bundle from an app
etc
all operations that can be carried on, if with some considerable effort, but are unlikely to do much good (either because the app cannot use the result, or there are more convenient alternatives).
Hope this helps

Answer 2

SWIFT:
No the app assets, but you could save the image in "Document":
let dirPath = dirPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
let imagePath = (dirPath as NSString).stringByAppendingPathComponent("IMAGE.EXT")
let fileManager = NSFileManager.defaultManager()
do
{
try fileManager.createDirectoryAtPath(imagePath, withIntermediateDirectories: true, attributes: nil)
}
catch _
{
}
if let image: UIImage = UIImage(data: DATA)//OR YOUR SOURCE
{
var imageData: NSData! = UIImagePNGRepresentation(image)
if imageData == nil
{
imageData = UIImageJPEGRepresentation(image, 100)
}
if imageData == nil
{
//DO SOMETHING..
}
imageData!.writeToFile(imagePath, atomically: true)
}
And then load with:
if fileManager.fileExistsAtPath(imagePath)
{
return UIImage(contentsOfFile: imagePath)
}
That works for me, hope it helps!