How to retrieve PHAsset from UIImagePickerController

Question

I'm trying to retrieve a PHAsset however PHAsset.fetchAssets(withALAssetURLs:options:) is deprecated from iOS 8 so how can I properly retrieve a PHAsset?

score 20 · Answer 1 · answered Oct 04 '17 at 01:50

20

I had the same the issue, first check permissions and request access:

let status = PHPhotoLibrary.authorizationStatus()

if status == .notDetermined  {
    PHPhotoLibrary.requestAuthorization({status in

    })
}

Just hook that up to whatever triggers your UIImagePickerController. The delegate call should now include the PHAsset in the userInfo.

guard let asset = info[UIImagePickerControllerPHAsset] as? PHAsset

answered Oct 04 '17 at 01:50

Andrew Geisthardt

237
2
4

1

This is available to iOS 11.0 and above. Any solution for lower versions of iOS? – Ishika Apr 12 '18 at 07:38
3

I get `nil` for this in the simulator. – mxcl Apr 27 '18 at 19:31
The info key enums have changed to be more Swift-like. Replace `UIImagePickerControllerPHAsset` with `UIImagePickerController.InfoKey.phAsset`, or just `.phAsset`. – commscheck Apr 04 '19 at 05:48
I had this problem on iPhone 6s but not on iPhone XSMax, after this suggestion works on 6S also, btw both iPhone's are on latest iOS 13.5 firmware – clopex May 29 '20 at 09:26

score 6 · Answer 2 · answered Dec 05 '18 at 06:19

Here is my solution:

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

        if #available(iOS 11.0, *) {
               let asset = info[UIImagePickerControllerPHAsset]

        } else {
               if let assetURL = info[UIImagePickerControllerReferenceURL] as? URL {
               let result = PHAsset.fetchAssets(withALAssetURLs: [assetURL], options: nil)
               let asset = result.firstObject
               }
       }
}

score 3 · Answer 3 · answered Apr 06 '20 at 20:21

3

The PHAsset will not appear in the didFinishPickingMediaWithInfo: info result unless the user has authorized, which did not happen for me just by presenting the picker. I added this in the Coordinator init():

            let status = PHPhotoLibrary.authorizationStatus()

            if status == .notDetermined  {
                PHPhotoLibrary.requestAuthorization({status in

                })
            }

answered Apr 06 '20 at 20:21

David Tristram

189
1
3

This helped! It's really not obvious you need to ask for authorization, because the picker shows up, and returns images even without it. – alekop Feb 27 '21 at 02:35

Jesus Rodriguez · Answer 4 · 2017-07-11T17:59:28.653

I am not sure what you want.

Are you trying to target iOS 8?

This is how I fetch photos and it works in iOS (8.0 and later), macOS (10.11 and later), tvOS (10.0 and later). Code is commented where it may be confusing

The first functions sets the options to fetch the photos

The second function will actually fetch them

 //import the Photos framework
 import Photos
 //in these arrays I store my images and assets
 var images = [UIImage]()
 var assets = [PHAsset]()

 fileprivate func setPhotoOptions() -> PHFetchOptions{
        let fetchOptions = PHFetchOptions()
        fetchOptions.fetchLimit = 15
        let sortDescriptor = NSSortDescriptor(key: "creationDate", ascending: false)
        fetchOptions.sortDescriptors = [sortDescriptor]
        return fetchOptions
    }




fileprivate func fetchPhotos() {
let allPhotos = PHAsset.fetchAssets(with: .image, options: setPhotoOptions())

DispatchQueue.global(qos: .background).async {

    allPhotos.enumerateObjects({ (asset, count, stop) in
        let imageManager = PHImageManager.default()
        let targetSize = CGSize(width: 200, height: 200)
        let options = PHImageRequestOptions()
        options.isSynchronous = true
        imageManager.requestImage(for: asset, targetSize: targetSize, contentMode: .aspectFit, options: options, resultHandler: { (image, info) in

            if let image = image {
                self.images.append(image)
                self.assets.append(asset)


            }

            if count == allPhotos.count - 1 {
                DispatchQueue.main.async {
                    //basically, here you can do what you want
                    //(after you finish retrieving your assets)
                    //I am reloading my collection view
                    self.collectionView?.reloadData()
                }
            }

        })


    })

}

}

Edit based on OP's clarification

You need to set the delegate UIImagePickerControllerDelegate

then implement the following function

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

within said method, get the image like this:

var image : UIImage = info[UIImagePickerControllerEditedImage] as! UIImage

I want to retrieve the PHAsset from an image that I have gotten from UIImagePickerController — Peter Warbo, Jul 07 '17 at 19:44
I can't believe the only way to do this is fetch the whole photo library and then enumerate each photo! — Frederic Adda, Sep 30 '17 at 18:34

How to retrieve PHAsset from UIImagePickerController

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