Georg Hennerbichler Georg Hennerbichler - 1 year ago 142
iOS Question

Getting the URL of picture taken by camera with Photos Framework

I have an app that uses a UIImagePickerController to retrieve pictures both from camera and from the photos library.
In the image picker delegate I only want to save the NSURL (UIImagePickerControllerReferenceURL) of the picked image to save memory. When the user needs to see the image later on, I load it with PHCachingImageManager directly from the photos library.

Now - this whole thing works great with pictures the user chooses from the library, but not with pictures directly taken by camera (since there is no URL). I am currently trying to save the picture with PHAsset, but I have no idea how to get the NSURL of the save picture.

This is what I've been up to:

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject])
picker.dismissViewControllerAnimated(true, completion: nil)

let pickedImage = info[UIImagePickerControllerOriginalImage] as! UIImage

if picker.sourceType == .Camera
// When taking a picture with the camera, store it in the user roll
{ () -> Void in

// save the image

// TODO how to get the asset url

}, completionHandler:
{ (finished, error) -> Void in
if (finished)


let pickedImageUrl: NSURL? = info[UIImagePickerControllerReferenceURL] as? NSURL

currentImageUrl = pickedImageUrl

currentImage = pickedImage



Any ideas how to get the url of the saved picture?


Answer Source

UPDATE: Seems like I found an answer to this Problem.

Step 1: I save the image to the camera

UIImageWriteToSavedPhotosAlbum(image.image, self, #selector(cameraImageSavedAsynchronously), nil)

this is done asynchronously, so make sure to set a selector when operation has finished.

Step 2: When operation has completed, I do the following:

func fetchLastImage(completion: (localIdentifier: String?) -> Void)
    let fetchOptions = PHFetchOptions()
    fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
    fetchOptions.fetchLimit = 1

    let fetchResult = PHAsset.fetchAssetsWithMediaType(.Image, options: fetchOptions)
    if (fetchResult.firstObject != nil)
        let lastImageAsset: PHAsset = fetchResult.firstObject as! PHAsset
        completion(localIdentifier: lastImageAsset.localIdentifier)
        completion(localIdentifier: nil)

I fetch the last image in camera roll with PHAsset and save the local identifier of the image. This is not an URL, but a unique identifier which does not change. This way, you can access the saved image perfectly.

Hope this helps others!

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