PHImageManager requestImageForAsset returns nil sometimes for iCloud photos

Question

Roughly 10% of the time PHImageManager.defaultManager().requestImageForAsset returns nil instead of a valid UIImage after first returning a valid though "degraded" UIImage. No error or other clue that I can see is returned in the info with the nil.

This seems to happen with photos that need to be downloaded from iCloud, with iCloud Photo Library and Optimize iPad Storage both enabled. I've tried changing the options, size, etc. but nothing seems to matter.

If I retry the requestImageForAsset after the failure it will usually correctly return a UIImage, though sometimes it requires a couple of retries.

Any idea what I might be doing wrong? Or is it just a bug in the Photos framework?

    func photoImage(asset: PHAsset, size: CGSize, contentMode: UIViewContentMode, completionBlock:(image: UIImage, isPlaceholder: Bool) -> Void) -> PHImageRequestID? {

    let options = PHImageRequestOptions()
    options.networkAccessAllowed = true
    options.version = .Current
    options.deliveryMode = .Opportunistic
    options.resizeMode = .Fast

    let requestSize = !CGSizeEqualToSize(size, CGSizeZero) ? size : PHImageManagerMaximumSize
    let requestContentMode = contentMode == .ScaleAspectFit ? PHImageContentMode.AspectFit : PHImageContentMode.AspectFill

    return PHImageManager.defaultManager().requestImageForAsset(asset, targetSize: requestSize, contentMode: requestContentMode, options: options)
        { (image: UIImage!, info: [NSObject : AnyObject]!) in
            if let image = image {
                let degraded = info[PHImageResultIsDegradedKey] as? Bool ?? false
                completionBlock(image: photoBlock.rotatedImage(image), isPlaceholder: degraded)

            } else {
                let error = info[PHImageErrorKey] as? NSError
                NSLog("Nil image error = \(error?.localizedDescription)")
           }
    }
}

Answer 1

I just went through this too. By my tests the issue appears on devices that have the "Optimize Storage" option enabled and resides in the difference between the two methods bellow:

[[PHImageManager defaultManager] requestImageForAsset: ...]

This will successfully fetch remote iCloud images if your options are correctly configured.

---

[[PHImageManager defaultManager] requestImageDataForAsset:...]

This function only works for images that reside on the phones memory or that were recently fetched from iCloud by your app on any other one.

---

Here's a working snippet I'm using -bear with me the Obj-c :)

 PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
 options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat; //I only want the highest possible quality
 options.synchronous = NO;
 options.networkAccessAllowed = YES;
 options.progressHandler = ^(double progress, NSError *error, BOOL *stop, NSDictionary *info) {
        NSLog(@"%f", progress); //follow progress + update progress bar
    };

  [[PHImageManager defaultManager] requestImageForAsset:myPhAsset targetSize:self.view.frame.size contentMode:PHImageContentModeAspectFill options:options resultHandler:^(UIImage *image, NSDictionary *info) {
        NSLog(@"reponse %@", info);
        NSLog(@"got image %f %f", image.size.width, image.size.height);
    }];

Full gist available on github

Updated for Swift 4:

    let options = PHImageRequestOptions()
    options.deliveryMode = PHImageRequestOptionsDeliveryMode.highQualityFormat
    options.isSynchronous = false
    options.isNetworkAccessAllowed = true

    options.progressHandler = {  (progress, error, stop, info) in
        print("progress: \(progress)")
    }

    PHImageManager.default().requestImage(for: myPHAsset, targetSize: view.frame.size, contentMode: PHImageContentMode.aspectFill, options: options, resultHandler: {
     (image, info) in
        print("dict: \(String(describing: info))")
        print("image size: \(String(describing: image?.size))")
    })